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Littérature scientifique sur le sujet « FRCC »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "FRCC"

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Lambert, Annie, Magne Østerås, Karine Mandon, Marie-Christine Poggi et Daniel Le Rudulier. « Fructose Uptake in Sinorhizobium meliloti Is Mediated by a High-Affinity ATP-Binding Cassette Transport System ». Journal of Bacteriology 183, no 16 (15 août 2001) : 4709–17. http://dx.doi.org/10.1128/jb.183.16.4709-4717.2001.

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ABSTRACT By transposon mutagenesis, we have isolated a mutant ofSinorhizobium meliloti which is totally unable to grow on fructose as sole carbon source as a consequence of its inability to transport this sugar. The cloning and sequencing analysis of the chromosomal DNA region flanking the TnphoA insertion revealed the presence of six open reading frames (ORFs) organized in two loci, frcRS and frcBCAK, transcribed divergently. The frcBCA genes encode the characteristic components of an ATP-binding cassette transporter (FrcB, a periplasmic substrate binding protein, FrcC, an integral membrane permease, and FrcA, an ATP-binding cytoplasmic protein), which is the unique high-affinity (Km of 6 μM) fructose uptake system in S. meliloti. The FrcK protein shows homology with some kinases, while FrcR is probably a transcriptional regulator of the repressor-ORF-kinase family. The expression of S. meliloti frcBCAK in Escherichia coli, which transports fructose only via the phosphotransferase system, resulted in the detection of a periplasmic fructose binding activity, demonstrating that FrcB is the binding protein of the Frc transporter. The analysis of substrate specificities revealed that the Frc system is also a high-affinity transporter for ribose and mannose, which are both fructose competitors for the binding to the periplasmic FrcB protein. However, the Frc mutant was still able to grow on these sugars as sole carbon source, demonstrating the presence of at least one other uptake system for mannose and ribose in S. meliloti. The expression of the frcBC genes as determined by measurements of alkaline phosphatase activity was shown to be induced by mannitol and fructose, but not by mannose, ribose, glucose, or succinate, suggesting that the Frc system is primarily targeted towards fructose. Neither Nod nor Fix phenotypes were impared in the TnphoAmutant, demonstrating that fructose uptake is not essential for nodulation and nitrogen fixation, although FrcB protein is expressed in bacteroids isolated from alfalfa nodulated by S. melilotiwild-type strains.
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Fantilli, Alessandro P., Lucia Paternesi Meloni, Tomoya Nishiwaki et Go Igarashi. « Tailoring Confining Jacket for Concrete Column Using Ultra High Performance-Fiber Reinforced Cementitious Composites (UHP-FRCC) with High Volume Fly Ash (HVFA) ». Materials 12, no 23 (3 décembre 2019) : 4010. http://dx.doi.org/10.3390/ma12234010.

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Ultra-High Performance Fibre-Reinforced Cementitious Composites (UHP-FRCC) show excellent mechanical performances in terms of strength, ductility, and durability. Therefore, these cementitious materials have been successfully used for repairing, strengthening, and seismic retrofitting of old structures. However, UHP-FRCCs are not always environmental friendly products, especially in terms of the initial cost, due to the large quantity of cement that is contained in the mixture. Different rates of fly ash substitute herein part of the cement, and the new UHP-FRCCs are used to retrofit concrete columns to overcome this problem. To simulate the mechanical response of these columns, cylindrical specimens, which are made of normal concrete and reinforced with different UHP-FRCC jackets, are tested in uniaxial compression. Relationships between the size of the jacket, the percentage of cement replaced by fly ash, and the strength of the columns are measured and analyzed by means of the eco-mechanical approach. As a result, a replacement of approximately 50% of cement with fly ash, and a suitable thickness of the UHP-FRCC jacket, might ensure the lowest environmental impact without compromising the mechanical performances.
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Swetnam, Tyson L., et Peter M. Brown. « Comparing selected fire regime condition class (FRCC) and LANDFIRE vegetation model results with tree-ring data ». International Journal of Wildland Fire 19, no 1 (2010) : 1. http://dx.doi.org/10.1071/wf08001.

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Fire Regime Condition Class (FRCC) has been developed as a nationally consistent interagency method in the US to assess degree of departure between historical and current fire regimes and vegetation structural conditions across differing vegetation types. Historical and existing vegetation map data also are being developed for the nationwide LANDFIRE project to aid in FRCC assessments. Here, we compare selected FRCC and LANDFIRE vegetation characteristics derived from simulation modeling with similar characteristics reconstructed from tree-ring data collected from 11 forested sites in Utah. Reconstructed reference conditions based on trees present in 1880 compared with reference conditions modeled by the Vegetation Dynamics Development Tool for individual Biophysical Settings (BpS) used in FRCC and LANDFIRE assessments showed significance relationships for ponderosa pine, aspen, and mixed-conifer BpS but not for spruce–fir, piñon–juniper, or lodgepole pine BpS. LANDFIRE map data were found to be ~58% accurate for BpS and ~60% accurate for existing vegetation types. Results suggest that limited sampling of age-to-size relationships by different species may be needed to help refine reference condition definitions used in FRCC assessments, and that more empirical data are needed to better parameterize FRCC vegetation models in especially low-frequency fire types.
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Chen, Zhi Tao, Ying Zi Yang et Yan Yao. « Effect of Ceramsite on the Dynamic Mechanical Properties of PVA Fiber Reinforced Cementitious Composite (PVA-FRCC) ». Applied Mechanics and Materials 174-177 (mai 2012) : 1507–11. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1507.

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The addition of ceramsite aimed to improve the toughness of high strength PVA-FRCC and reduce its weight. The quasi-static and dynamic compressive tests were carried out to obtain the compressive strength and the dynamic response of PVA-FRCC with the addition of ceramsite, respectively. The ceramsite can weaken the compressive strength of PVA-FRCC, the quasi-static compressive strength decrease with the increase of ceramsite volume fraction. With the increase of strain rate, the dynamic peak stress and critical compressive strain increase with different ceramsite volume fraction. At the same strain rate level, the dynamic compressive strength decrease with the increase of ceramsite volume fraction. The critical compressive strain of PVA-FRCC with 3% ceramsite volume fraction have the highest critical compressive strain at different strain rate.
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Del Zoppo, Marta, Costantino Menna, Marco Di Ludovico et Alberto Balsamo. « Flexural performance of RC columns with FRCC jacketing ». E3S Web of Conferences 97 (2019) : 03037. http://dx.doi.org/10.1051/e3sconf/20199703037.

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A new repair technique consisting on a light jacketing with Fibre Reinforced Cementitious Composites (FRCC) for existing reinforced concrete (RC) buildings has been recently proposed to reduce durability problems of RC members and enhance their capacity. In this work, the effects of FRCC jacketing on the flexural capacity of existing RC columns, with and without a pre-damage, has been evaluated of full-scale specimens under cyclic loading. Digital Imagine Correlation (DIC) was also adopted for understanding the strain distribution in the FRCC jacket. The results shown that the FRCC jacket without a proper anchorage slightly enhanced the flexural capacity of the column. The strengthened column experienced a low damage with respect to control column, but occurrence of premature failures did not allow the achievement of high levels of deformation capacity and ductility.
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Wang, Bing, Jian Guo Dai et Shi Lang Xu. « Experimental Study on Fracture Behavior of UHTCC Overlay/Concrete Interfaces under Mixed-Mode Loading ». Advanced Materials Research 97-101 (mars 2010) : 1277–81. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1277.

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Four-point bending tests are conducted on fiber reinforced cementitious composites (FRCC) overlaid concrete beams with a “T” notch. The objective is to evaluate the fracture behavior of the interface between the FRCC and the concrete substrates. Two types of FRCC overlays are prepared including a traditional steel fiber reinforced concrete (SFRC) composite and an ultra high toughness cementitious composite (UHTCC), which has a very high tensile strain capacity. All two types of FRCC are prepared in two forms: cast on-situ and prefabricated. Test results indicate that, in comparison with others, the prefabricated UHTCC overlay system has exhibited most desirable behavior in terms of the energy absorption in the interface as well as the crack distributions in the overlay, and therefore has a great potential for use in repair of concrete structures.
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Karki, Sandhya, M. Arlene A. Adviento-Borbe, Joseph H. Massey et Michele L. Reba. « Assessing Seasonal Methane and Nitrous Oxide Emissions from Furrow-Irrigated Rice with Cover Crops ». Agriculture 11, no 3 (19 mars 2021) : 261. http://dx.doi.org/10.3390/agriculture11030261.

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Improved irrigation management is identified as a potential mitigation option for methane (CH4) emissions from rice (Oryza sativa). Furrow-irrigated rice (FR), an alternative method to grow rice, is increasingly adopted in the Mid-South U.S. However, FR may provide a potential risk to yield performance and higher emissions of nitrous oxide (N2O). This study quantified the grain yields, CH4 and N2O emissions from three different water management practices in rice: multiple-inlet rice irrigation (MIRI), FR, and FR with cereal rye (Secale cereale) and barley (Hordeum vulgare) as preceding winter cover crops (FRCC). CH4 and N2O fluxes were measured from May to September 2019 using a static chamber technique. Grain yield from FR (11.8 Mg ha−1) and MIRI (12.0 Mg ha−1) was similar, and significantly higher than FRCC (8.5 Mg ha−1). FR and FRCC drastically reduced CH4 emissions compared to MIRI. Total seasonal CH4 emissions decreased in the order of 44 > 11 > 3 kg CH4-C ha−1 from MIRI, FR, and FRCC, respectively. Cumulative seasonal N2O emissions were low from MIRI (0.1 kg N2O-N ha−1) but significantly higher from FR (4.4 kg N2O-N ha−1) and FRCC (3.0 kg N2O-N ha−1). However, there was no net difference in global warming potential among FR, FRCC and MIRI. These results suggest that the increased N2O flux from furrow-irrigated rice may not greatly detract from the potential benefits that furrow-irrigation offers rice producers.
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SONPRASARN, Passakorn, Wichit PRAKAYPAN, Sureerat POLSILAPA, Nuntaporn KONGKAJUN, Edward A. LAITILA, Nutthita CHUANKRERKKUL et Parinya CHAKARTNARODOM. « The Influence of Different Crystal Modifiers on Ultra-Low Embodied Energy Curing Fiber-Reinforced Cement Composites ». Journal of Metals, Materials and Minerals 32, no 3 (30 septembre 2022) : 93–100. http://dx.doi.org/10.55713/jmmm.v32i3.1521.

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Fiber-reinforced cement composites (FRCC) are widely used in the construction of houses and commercial buildings in many countries such as the United States, the United Kingdom, the European countries, and the Asian countries such as China, India, and Thailand. Conventionally, the FRCC is manufactured from Portland cement, silica sand, and cellulose fiber using the so-called autoclaved curing under a designate hydrothermal condition to accelerate the hydration reaction resulting in superior properties. However, the autoclave-curing process needs a huge investment and generates highly environmental impact specially greenhouse gases due to its heavy energy consumption. Hence, this research aims to develop the FRCC with lowering embodied energy via the energy-free moisture curing process. The use of different crystal modifiers (CM) including synthetic tobermorite, alumino-silicate complex, and modified lithium compound in addition of the usual FRCC composition to drive the hydration kinetic and then properties achieved were characterized by the relevance of higher heat of hydration. Moreover, scanning electron microscope (SEM) were used to reveal the favorable effects of appropriate CM through the microstructure. The results approved that the FRCC with qualified mechanical performance and densified microstructure was successfully produced by using the appropriate moisture curing condition and CM. Additionally, using alumino-silicate complex as CM at 3% of cement weight produced FRCC with the highest modulus of elasticity of 9,067 ± 492 MPa, and the lowest % water absorption of 27.42 ± 1.65 %.
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Nishiwaki, Tomoya, Oscar Mancinelli, Alessandro Pasquale Fantilli et Yuka Adachi. « Mechanical and Environmental Proprieties of UHP-FRCC Panels Bonded to Existing Concrete Beams ». Sustainability 13, no 6 (11 mars 2021) : 3085. http://dx.doi.org/10.3390/su13063085.

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Among the techniques used to retrofit existing reinforced concrete structures, methods involving Ultra High Performance Fiber Reinforced Cementitious Composites (UHP-FRCC) are widely regarded. However, current practices make the use of this material for in-situ application expensive and complicated to perform. Accordingly, a new method to strengthen existing concrete beams by applying a precast UHP-FRCC layer on the bottom side are introduced and described herein. Two test campaigns are performed with the aim of defining the best conditions at the interface between the reinforcing layer and the existing beam and to reducing the environmental impact of UHP-FRCC mixtures. As a result, the eco-mechanical analysis reveals that the best performances are attained when the adhesion at interface is enhanced by means of steel nails on the upper surface of the UHP-FRCC layer, in which 20% of the cement is replaced by fly ash.
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Kanakubo, Toshiyuki, Takumi Koba et Kohei Yamada. « Flexural Characteristics of Functionally Graded Fiber-Reinforced Cementitious Composite with Polyvinyl Alcohol Fiber ». Journal of Composites Science 5, no 4 (1 avril 2021) : 94. http://dx.doi.org/10.3390/jcs5040094.

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The objective of this study is to investigate the flexural characteristics of functionally graded fiber-reinforced cementitious composite (FG-FRCC) concerning the fiber volume fraction (Vf) varying in layers and the layered effect in bending specimens. The FG-FRCC specimens, in which Vf increases from 0% in the compression zone to 2% in the tensile zone, are three-layered specimens using polyvinyl alcohol (PVA) FRCC that are fabricated and tested by a four-point bending test. The maximum load of the FG-FRCC specimens exhibits almost twice that of homogeneous specimens, even when the average of the fiber volume fraction in the whole specimen is 1%. The result of the section analysis, in which the stress–strain models based on the bridging law (tensile stress–crack width relationship owned by the fibers) consider the fiber orientation effect, shows a good adaptability with the experiment result.
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Thèses sur le sujet "FRCC"

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Caggiano, Antonio. « Meso-mechanical analysis of steel fiber reinforced cementitious composites ». Doctoral thesis, Universita degli studi di Salerno, 2013. http://hdl.handle.net/10556/825.

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2010 - 2011
The mechanical behavior of cement-based materials is greatly affected by crack propagation under general stress states. The presence of one or more dominant cracks in structural members modifies its response, possibly leading to brittle failure modes. The random dispersion of short steel fibers in cement materials is a new methodology used for enhancing the response in the post-cracking regime. The behavior of Fiber-Reinforced Cementitious Composite (FRCC), compared to conventional plain concrete, is characterized by several advantages, e.g., higher tensile and shear resistance, better post-cracking ductility, higher fracture energy, etc. In this framework, this thesis deals with both the experimental investigation and computational modeling of the mechanical behavior of FRCC. A great part of the work is intended at reporting the formulation and validation of a novel constitutive model aimed at simulating the stress-cracking response of FRCC and considering most complex fracture occurrences in mixed-modes of failure. Firstly, the results of an extensive experimental campaign, performed at the Laboratory of Materials testing and Structures (LMS) of the University of Salerno, is presented in which the possible influence of combining different fiber types on the resulting properties of Steel Fiber Reinforced Concrete (SFRC) is investigated. Particularly, the study concerns the four-point bending behavior of pre-notched SFRC beams where the influence of the amount of fibers and types on the first-crack strength and the whole post-cracking behavior is analyzed. After this, an innovative approach for reproducing the fiber effects on the cracking phenomena of the concrete/mortar matrix is proposed. The well-known discrete crack approach based on zerothickness interface elements is used to model the interaction between fibers and mortar as well as its degradation during fracture processes under mode I, II and/or mixed ones. The matrix degradation is modeled by means of a fracture energy-based softening law formulated in the framework of the flow theory of plasticity. Then, two fundamental aspects of the fiber-mortar interaction are considered in the model, i.e., the bond behavior of fibers bridging the crack opening and the dowel effect derived by possible relative transverse displacements of the two faces of the crack. The inclusion of fibers and the above two effects are taken into account by means of the well-known “Mixture Theory”. Particular emphasis and importance is dedicated to the description and modeling of the overall debonding behavior of fibers embedded in cementitious matrices. Actually, the adhesive interaction between fibers in concrete matrix is of key importance in controlling the postcracking response of FRCC. A unified formulation for simulating the overall bond behavior of fibers embedded in cementitious matrices is also presented. The proposed unified formulation is intended as a key element to be possibly employed in numerical models aimed at explicitly simulating the mechanical behavior of FRCC by taking into account the discrete nature of such materials and the contributions of the various constituents within the framework of the so-called meso-mechanical approach. The predictive capabilities of the aforementioned discontinuous approach for failure analyses of fiber reinforced cementitious composite are evaluated at different levels of observation. Particularly, the discrete crack formulation is employed and validated to simulate the fracture behavior of FRCC at constitutive, mesoscopic and macroscopic levels of observations. Several numerical results are performed to demonstrate if such proposal, based on the non-linear interface formulation, is capable to lead realistic predictions of failure processes of FRCC under different load scenarios and considering a wide spectrum of fiber contents and types. It is also analyzed if the proposed formulation is able to capture the significant influence of the fiber content on the maximum strength and post-peak ductility in mode I, II and mixed ones showing the capability of the cracking formulation to capture the complex interaction mechanisms between fibers and matrix. Furthermore, a simpler stress-crack opening model based on a hinge-crack approach, already available in the scientific literature, is proposed while the experimental results reported in this thesis are taken as reference for its validation. The model represents a reformulation of a fictitious crack model and is based on fracture mechanics concepts where the stress-crack opening relationship is accounted in a similar way obtainable by considering the pure “mode I” case of the discontinuous proposal formulated in general sense for mixed-modes of fracture. A closed-form solution for the stress-crack opening law with the explicit consideration of the fiber actions is considered for such a formulation. The model predictions, compared with the experimental measures, are performed to demonstrate the soundness of the model to reproduce the mechanical response of SFRC members in terms of Force-Crack Tip Opening Displacement (CTOD) curves. At last, both plain concrete and FRCC are analyzed and modeled by means of a novel microplanebased plasticity formulation. A continuum(smeared-crack) formulation, based on the non-linear microplane theory combined with the well-known “Mixture Theory”, is considered for describing the fiber effects on the failure behavior of FRCC. The constitutive formulation, failure analyses and the interactions between cementitious matrix and steel fibers are similarly approached as outlined for the discontinuous proposal. The capabilities of the microplane model to capture the significant enhancement in the post-cracking behavior of FRCC, with particular emphasis on the fracture and post-peak strengths, are finally evaluated by considering some experimental data available in scientific literature. [edited by author]
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Lassoued, Rafika. « Contributions aux équations d'évolution frac-différentielles ». Thesis, La Rochelle, 2016. http://www.theses.fr/2016LAROS001/document.

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Dans cette thèse, nous nous sommes intéressés aux équations différentielles fractionnaires. Nous avons commencé par l'étude d'une équation différentielle fractionnaire en temps. Ensuite, nous avons étudié trois systèmes fractionnaires non linéaires ; le premier avec un Laplacien fractionnaire et les autres avec une dérivée fractionnaire en temps définie au sens de Caputo. Dans le premier chapitre, nous avons établi les propriétés qualitatives de la solution d'une équation différentielle fractionnaire en temps qui modélise l'évolution d'une certaine espèce. Plus précisément, l'existence et l'unicité de la solution globale sont démontrées pour certaines valeurs de la condition initiale. Dans ce cas, nous avons obtenu le comportement asymptotique de la solution en t^α. Sous une autre condition sur la donnée initiale, la solution explose en temps fini. Le profil de la solution et l'estimation du temps d'explosion sont établis et une confirmation numérique de ces résultats est présentée. Les chapitres 4, 5 et 6 sont consacrés à l'étude théorique de trois systèmes fractionnaires : un système de la diffusion anormale qui décrit la propagation d'une épidémie infectieuse de type SIR dans une population confinée, le Brusselator avec une dérivée fractionnaire en temps et un système fractionnaire en temps avec une loi de balance. Pour chaque système, on présente l'existence globale et le comportement asymptotique des solutions. L'existence et l'unicité de la solution locale pour les trois systèmes sont obtenues par le théorème de point fixe de Banach. Cependant, le comportement asymptotique est établi par des techniques différentes : le comportement asymptotique de la solution du premier système est démontré en se basant sur les estimations du semi-groupe et le théorème d'injection de Sobolev. Concernant le Brusselator fractionnaire, la technique utilisée s'appuie sur un argument de feedback. Finalement, un résultat de régularité maximale est utilisé pour l'étude du dernier système
In this thesis, we are interested in fractional differential equations. We begin by studying a time fractional differential equation. Then we study three fractional nonlinear systems ; the first system contains a fractional Laplacian, while the others contain a time fractional derivative in the sense of Caputo. In the second chapter, we establish the qualitative properties of the solution of a time fractional equation which describes the evolution of certain species. The existence and uniqueness of the global solution are proved for certain values of the initial condition. In this case, the asymptotic behavior of the solution is dominated by t^α. Under another condition, the solution blows-up in a finite time. The solution profile and the blow-up time estimate are established and a numerical confirmation of these results is presented. The chapters 4, 5 and 6 are dedicated to the study of three fractional systems : an anomalous diffusion system which describes the propagation of an infectious disease in a confined population with a SIR type, the time fractional Brusselator and a time fractional reaction-diffusion system with a balance law. The study includes the global existence and the asymptotic behavior. The existence and uniqueness of the local solution for the three systems are obtained by the Banach fixed point theorem. However, the asymptotic behavior is investigated by different techniques. For the first system our results are proved using semi-group estimates and the Sobolev embedding theorem. Concerned the time fractional Brusselator, the used technique is based on an argument of feedback. Finally, a maximal regularity result is used for the last system
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Atkinson, Karen A. « FRIC : an expert system to recognize fricatives / ». Online version of thesis, 1987. http://hdl.handle.net/1850/8805.

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Orozco, Margarita Maria Duenas. « Caracterização da gramínea vetiveria zizanioides para aplicação na recuperação de áreas degradadas por erosão ». Universidade Federal de Minas Gerais, 2009. http://hdl.handle.net/1843/FRPC-82SGNK.

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The appearance of degraded areas in Brazil has been increasing considerably along the years, causing countless damages to the environment. According to FAO (2005), approximately 16% of the total area of Brazil presents some state of soil degradation induced by human activities. In reason of this, the present study has as objective characterizes the Vetiver grass (Vetiveria zizanioides) for application in the recovery of areas degraded by erosion, through the installation of plots in field and accomplishment of a laboratory and field experimental program. This grass was chosen because of its special characteristics, especially the high tolerance to extreme conditions, little height and extensive root system. To reach the objective, it was considered the adaptation and growth of the plant in the studied substrata, analyzed in physical and chemical level. Besides, the mechanical properties of the Vetiveria zizanioides roots were evaluated, studying the increase in resistance imposed by roots in the soil, as well as its root tensile strength. In the same way, it was considered the soil losses generated by the water erosion in each plot with different implanted treatment. The results showed that the grass requires care in its initial growth phase as well as other plants; however, it is resistant and can survive under adverse conditions. Concerning shear strength, unlike the expected, the soil-root system presented smaller resistances than the soil without roots. Possibly the choice of the work scale was not the most appropriate, being recommended working with larger samples or to do the tests directly in field with larger size equipments. Confirming results reported by other authors, great variability was observed in the data regarding the root tensile strength. In the same way, it was ratified the trend of smaller diameters roots to present larger tensile strength. Regarding the soil losses, it was observed that the largest losses were generated in the control plots, where there was no type of soil cover, as well as in the area of larger inclination and larger spacing among the strings of the grass. In face of those results, it is verified that is not possible to assure the success of bioengineering techniques application in the recovery of degraded areas just with isolated studies. The interest on the subject is not exhausted with this research, so it is necessary to carry out additional researches on real scale.
O surgimento de áreas degradadas no Brasil tem aumentado consideravelmente ao longo dos anos, ocasionando inúmeros prejuízos ao meio ambiente. Segundo a FAO (2005), aproximadamente 16% da área total do Brasil apresenta algum estado de degradação do solo induzida por atividades antrópicas. Em razão disto, o presente estudo tem como objetivo caracterizar a gramínea Vetiveria zizanioides para aplicação na recuperação de áreas degradadas por erosão, através da instalação de parcelas em campo e realização de um programa de ensaios de laboratório e campo. A gramínea foi escolhida, em virtude de suas características especiais, notadamente a alta tolerância a condições extremas, pouca altura e extenso sistema radicular. Para alcançar o objetivo, considerou-se a adaptação e crescimento da planta nos substratos de estudo, analisados em nível físico-químico. Além disso, avaliaram-se as propriedades mecânicas das raízes do Vetiveria zizanioides, estudando o ganho de resistência imposta pela sua raiz no solo, assim como sua resistência à tração. Do mesmo modo, determinou-se a perda de solo gerada pela erosão hídrica em cada parcela de estudo com diferentes tratamentos implantados. Os resultados mostraram que a gramínea requer cuidados em sua fase inicial assim como outras plantas; no entanto, ela se mostrou resistente tendo sobrevivido a condições adversas. No tocante à resistência ao cisalhamento, ao contrário do esperado, as matrizes de solo-raiz apresentaram menores resistências do que o solo sem raiz. Possivelmente a escolha da escala de trabalho não foi a mais adequada, sendo recomendado trabalhar com corpos de prova maiores ou fazer os ensaios diretamente em campo com equipamentos de maior porte. Confirmando resultados reportados por diferentes autores, observou-se grande variabilidade nos dados referentes à resistência das raízes submetidas à tração. Da mesma maneira, ratificou-se a tendência de que raízes de menores diâmetros apresentam maiores resistências. Com relação à perda de solo, observou-se que as maiores perdas foram geradas nas parcelas de controle, onde não existiu nenhum tipo de recobrimento do solo, assim como na área de maior inclinação e maior espaçamento entre os cordões da gramínea. Em face desses resultados, verifica-se que não é possível assegurar o êxito da aplicação de técnicas de bioengenharia na recuperação de áreas degradadas apenas com estudos isolados. O interesse sobre o assunto não se esgota nesta pesquisa, de modo que o tema prescinde de pesquisas complementares a serem efetivadas em escala real.
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Silva, Alex Fabiane Fares da. « Gerenciamento de resíduos de construção civil de acordo com a resolução CONAMA 307/02 : estudo de caso para um conjunto de obras de pequeno porte ». Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/FRPC-78WFYS.

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In Brazil and abroad, the construction sector is well know as the largest user of natural resources and the largest producer of waste. The waste disposal becomes more difficult each day due to the high costs of transportation and also to the difficulty in finding areas which can achieve environmental requirements. In this context, the Brazilian National Environmental Committee (Conselho Nacional do Meio Ambiente, CONAMA), published in 2002 the CONAMA Resolution 307, establishing guidelines, criteria and procedures for the management of the waste generated by civil construction, assigning to the municipalities and to the large producers the responsibility to separate and dispose their waste in accordance with a suggested classification. According to research data, the largest proportion of civil construction wastes produced daily in Brazil comes from informal sites, involving small constructions, refurbishment and demolition activities. This way the small producers become responsible for the largest proportion of the waste generated. In this context, this research describes the results of the implementation of the mentioned resolution guidelines in a group of small construction sites in the area of Belo Horizonte, Minas Gerais (Brazil). Three new construction sites (residential, commercial and industrial) and a refurbishment site were chosen. They were monitored and, beyond the measurement of the input materials and the waste produced, indexes, which can be used in similar construction sites, were developed. The costs of each management phase were also obtained. The research conducted showed a large difference in the amount of waste produced in refurbishment (684 kg/m2) and new construction sites (average of 97,75 kg/m2). Its segregation at the production point allowed an improvement in organisation, hygiene conditions and occupational safety, as well as a simpler recycling and appropriate final disposal. It can also be ighlighted the potential reuse of the waste in the construction sites, the low cost of its management (average of 0,22% to new construction activities) and the fact that such management activities did not change the physical timeline of the construction sites assessed
No Brasil e no exterior, a indústria da construção civil se destaca como a maior consumidora de recursos naturais e a maior geradora de resíduos. A sua disposição final fica mais complicada a cada dia, devido aos elevados custos com transporte e à dificuldade na escolha de áreas que atendam aos requisitos ambientais. Devido a essa situação, o Conselho Nacional do Meio Ambiente (CONAMA) criou a Resolução CONAMA nº. 307, publicada em 2002, que estabeleceu diretrizes, critérios e procedimentos para a gestão dos resíduos da construção civil, atribuindo aos municípios e aos grandes geradores a responsabilidade de segregar e dispor seus resíduos de acordo com uma classificação sugerida. Conforme dados pesquisados, a maior parte dos resíduos da construção civil gerados diariamente no Brasil, provêm de eventos informais: pequenas obras de construção, reformas e demolições. Sendo assim, os pequenos geradores se tornam responsáveis pela maior parcela dos resíduos gerados. Em função disso, o presente trabalho vem relatar os resultados obtidos com a implantação das diretrizes desta resolução em um conjunto de obras de pequeno porte na região de Belo Horizonte (MG). Foram escolhidas três construções novas (residencial, comercial e industrial) e uma obra de reforma. Todas elas foram monitoradas e, além da quantificação dos insumos e dos resíduos gerados, foram obtidos índices que podem ser utilizados na gestão de obras do mesmo tipo. Também foi apurado o custo de todas as etapas do gerenciamento. Os estudos realizados mostraram uma grande diferença na quantidade de resíduos gerados entre a reforma (684 kg/m2) e as construções novas (média de 97,75 kg/m2). A sua segregação no momento da geração proporcionou uma melhoria na organização, nas condições de higiene e segurança do trabalho, e facilitou a sua reciclagem e a correta disposição final. Pode-se destacar ainda a possibilidade de reaproveitamento de resíduos na própria obra, o baixo custo do seu gerenciamento (média de 0,22% para as construções novas) e o fato desta gestão não ter alterado o cronograma físico das obras estudadas
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Ladeira, Josias Eduardo Rossi. « Avaliação de segurança em barragem de terra, sob o cenário de erosão tubular regressiva, por métodos probabilísticos : o caso UHE São Simão ». Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/FRPC-78HHUG.

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The research describes the safety assessment for an embankment dam under the scenario of hypothetical backward erosion piping by probability methods, the case study being the embankment dam of the São Simão hydropower plant, in southcentral Brazil. The results identified critical points that justify more attention and prevention actions in order to avoid environmental impacts of embankment dam accidents. The performance methods for assessing the relative likelihood of piping failure was done by performance analysis and as a checked on event tree analysis (ETA), in order to assess the safety for embankment dam in study. The likelihood assessment of piping from the embankment took into account the dam zoning, filters, age of the dam, core soil types, compaction, foundation geology, dam performance, and monitoring and surveillance for 29 years of operation. The method involves the adjustment of the historical average probabilities of the three modes of progressive backward erosion: piping through the embankment, piping through the foundation and piping from the embankment into the foundation, by historic failures. The methods employed in this research are referred to as the UNSW method (University of New South Wales) and the ETA (Event Tree Analysis) method. The data base used to qualify the historical failures is composed by 1462 dams, which correspond to approximately 13% of world population of existing dams until 1982. The historical annual probability of failure of large embankment dams was estimated in 4,5 x 10-4 per dam per year, which is coherent the research results.
A pesquisa descreve a avaliação de segurança em barragem de terra, sob o cenário de erosão tubular regressiva (piping), por métodos probabilísticos, tendo como estudo de caso a barragem da UHE São Simão. Os resultados identificaram pontos críticos que merecem mais atenção e ações de prevenção para evitar impactos ambientais decorrentes de ruptura da barragem. Para avaliar a segurança da barragem em estudo e a respectiva probabilidade relativa de ruptura por piping, foram empregados os métodos de análise de performance e de análise por Árvore de Eventos (ETA). A avaliação de probabilidade de piping para o barramento considerou sua seção transversal típica, os seus filtros, o seu tempo de operação, os tipos de solo usado no núcleo, a compactação, a geologia da fundação, a performance da barragem, o monitoramento e a supervisão por 29 anos de operação. O método envolve o ajuste de probabilidades médias históricas de três modos de erosão tubular regressiva: piping através do barramento, piping através da fundação e piping do barramento para a fundação, considerando as rupturas históricas. Os métodos aqui referenciados são denominados UNSW (University of New South Wales) e ETA (Event Tree Analysis). A base de dados amostrais utilizada para a quantificação de rupturas e acidentes históricos compreendeu 1.462 barragens, as quais correspondem a aproximadamente 13% da população mundial de barragens existentes até 1982. A probabilidade anual de ruptura por piping em grandes barragens é estimada em 4,5 x 10-4 por barragem, a qual se mostrou coerente com o resultado da presente pesquisa.
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Pinto, Marcelo Martins. « Avaliação da implantação de cobertura vegetal em uma pilha de fosfogesso ». Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/FRPC-78HHER.

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The present work aims to show to the methodology used for attainment of a vegetal covering on the of Phosphogypsum stack located at the Industrial Complex of Uberaba of property of the company FOSFERTIL Fertilizantes Fosfatados S.A, aiming at the reduction of the visualimpact proportionated, as well as the prevention of erosive processes and the dispersion of particles. It also aims at evaluating this methodology through the statistics analysis of the experiment, evaluation of the vegetation and the substratum throughout 4 years of plantation.To accomplish that an ample diagnosis was made that involved the stacks of Phosphogypsum in Uberaba MG and Cubatão SP, being that this second had a espontanneausly formed vegetal covering, wich allowed to evaluate the diverse impediments to the growth ofvegetation in the stack of Uberaba. The main limiting factors to the growth of vegetation in the stack of Uberaba had consisted of very low pH, the superficial crust caused by the Phosphogypsum crystallization, theabsence of structures and porosity and the nutricional disequilibrium of the material, that demanded several tests to correct of these factors.Many tests for the correction of these impediments had been carried out, where it concludes that if a correction of the Phosphogypsum using soil, organic matter, dolomitic limestone and the sludge residues from a treatment lagoon existing at the company. After these measures the vegetal covering with good vegetative vigor that it occupied more than 95% of the planted surface would be obtained. Based on these tests definitive planting were carried through in the stack from the years of2002 to 2005, wich allowed to evaluate the behavior of the vegetation and the substratum formed as time passed, as well to investigate the main causes of imperfections verified in these plantings. It was concluded in this work that the employed methodology was a successful, not only forthe result of the vegetal covering in the plantings that were done, wich had always been superior to 95% of the experimental process, but also because it indicates that it can be reapplied in other existing stacks in the country and the world, as well as other industrial stacks of similar characteristics.
O presente trabalho mostra a metodologia empregada para a obtenção de cobertura vegetal sobre a pilha de Fosfogesso situada no Complexo Industrial de Uberaba de propriedade da empresa FOSFERTIL Fertilizantes Fosfatados S.A, visando a redução do impacto visualproporcionado pela mesma, bem como a prevenção de processos erosivos e a dispersão de particulados. Visa também avaliar esta metodologia através da análise estatística do experimento montado, avaliação da vegetação e do substrato ao longo de 4 anos de plantio.Para tanto foi realizado um amplo diagnóstico que envolveu as pilhas de Fosfogesso de Uberaba MG e de Cubatão SP, sendo que esta segunda possuía uma cobertura vegetal formada espontaneamente, que permitiu avaliar os diversos impedimentos ao crescimento de plantas na pilha de Uberaba. Os principais impedimentos ao crescimento de vegetação na pilha de Uberaba consistiram em um pH muito baixo, no encrostamento superficial causado pela cristalização do Fosfogesso, na ausência de estruturas e de porosidade e no desequilíbrio nutricional do substrato.Foram realizados diversos testes para correção destes impedimentos e concluiu-se que com a correção do Fosfogesso utilizando terra, matéria orgânica, calcário dolomítico e o resíduo da lagoa de tratamento existente na empresa, obtinha-se uma cobertura vegetal com bom vigorvegetativo e que ocupava mais de 95% da superfície plantada.Com base nestes testes foram realizados plantios definitivos na pilha durante os anos de 2002 a 2005, que permitiram avaliar o comportamento da vegetação e do substrato formado ao longo deste tempo, bem como investigar as principais causas de falhas verificadas nestes plantios. Conclui-se neste trabalho que a metodologia de cobertura vegetal empregada foi um sucesso, não só pelo resultado da cobertura vegetal nos plantios realizados, que sempre foramsuperiores aos 95% da área plantada, obtidos no processo experimental, mas também porque sinaliza a possibilidade de reaplicação em outras pilhas existentes no país e no mundo, bemcomo em outros aterros industriais de características semelhantes.
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Fernandes, Juliana Goncalves. « Estudo da emissão de biogás em um aterro sanitário experimental ». Universidade Federal de Minas Gerais, 2009. http://hdl.handle.net/1843/FRPC-82SGSZ.

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Uncontrolled emissions of biogas is a serious problem of local and global air pollution. The effects of the release of gases locally vary from simple bad odor to possible carcinogenic diseases in the community surrounding the landfill. In relation to global air pollution and climate changes, the main effect of the release of biogas is the increasing of greenhouse effect. The main objective of this study is to evaluate the biogas emissions at the Experimental Sanitary Landfill in Belo Horizonte. Field tests, using static flux chamber device, were carried out in order to measure biogas emissions through the final cover. Gas emissions in 6 drains present in the experimental sanitary landfill have also been measured. The results obtained in field studies enabled the comparison with calculated values using the empirical method LANDGEM from USEPA. The experimental sanitary landfill has two final cover configurations. The first, called capillary barrier consisted of 30 cm soil overlaying 30 cm of recycled construction and demolition waste, and the second layer, called evapotranspirative cover, with about 60 cm of soil. The estimative of CH4 and CO2 average flow through the final cover using the methodology of flux chamber were 375 kg and 353 kg, respectively, released to the atmosphere per day. The procedures used to determine the gas flow in system of drains indicated very low values, suggesting a small efficiency of the drains. The results confirmed that the experimental sanitary landfill is at methanogenic phase with high concentration of CH4 and CO2. Comparing the internal concentration of methane to the emissions from the final cover, it was observed qualitatively a reduction of methane concentration between 38 and 68%. This fact dation of methane in the final cover layer due to presence of methanotrophic bacteria. Comparisons of values found using flux chamber to the values calculated by the model LANDGEM presented a large variation. These values were similar when extremes values of the parameters suggested by the model were used
A emissão descontrolada do biogás em aterros sanitários é um grave problema de poluição atmosférica local e global. Os efeitos da liberação dos gases localmente variam do simples odor até possíveis doenças cancerígenas na comunidade circunvizinha ao aterro. Em relação à poluição atmosférica global, o principal efeito da liberação do biogás é o aquecimento do globo terrestre que vem gerando grandes discussões nos últimos anos. A presente pesquisa aborda estudos de emissões de biogás no Aterro Sanitário Experimental de Belo Horizonte. Foram realizados ensaios em campo, com a utilização de placa de fluxo estática, no intuito de mensurar as emissões de biogás pela camada de cobertura. Também foram avaliadas as emissões de gases pelos 6 drenos presentes no Aterro Experimental. Com os resultados obtidos nos estudos em campo, foi possível a comparação com valores calculados a partir do método empírico LANDGEM da USEPA. O aterro experimental possui duas configurações de camada de cobertura final. A primeira, denominada barreira capilar, constituída de 30 cm de solo fino sobreposto a 30 cm de resíduos de construção civil (entulho) reciclado, e a segunda camada, denominada evapotranspirativa, com cerca de 60 cm de solo fino. A estimativa do fluxo médio de CH4 e CO2 pela camada de cobertura encontrado utilizando a metodologia da placa de fluxo foi de 375 kg e 353 kg, respectivamente, emitidos para a atmosfera por dia. Os procedimentos utilizados para a determinação do fluxo de gases pelo sistema de drenos implantado no aterro sanitário experimental indicaram vazões muito baixas, sugerindo a pouca eficiência dos mesmos. Pode-se verificar que o aterro sanitário está na fase metanogênica de biodegradação dos resíduos com elevada presença de CH4 e CO2. Ainda que de forma qualitativa, foram observadas reduções entre 38 e 68% da concentração de metano, quando comparadas as concentração internas e os valores emitidos pela camada de cobertura. Esse fato sugere a possibilidade de oxidação do metano na camada de cobertura que ocorre pela ação de bactérias metanotróficas, no entanto, não foi constatado aumento na concentração de CO2. Comparações dos valores entre os valores obtidos em campo com os valores calculados pelo modelo LANDGEM diferiram bastante. Esses valores aproximaram-se quando foram utilizados valores extremos dos parâmetros de entrada no modelo.
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Martins, Henrique Lembi. « Avaliação da resistência de resíduos sólidos urbanos por meio de ensaios de cisalhamento direto em equipamento de grandes dimensões ». Universidade Federal de Minas Gerais, 2006. http://hdl.handle.net/1843/FRPC-6ZNJ2D.

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In the last years, in Brazil and abroad, due to the increase of restrictions of the environmental legislation, the design and operation of safe facilities for municipal solid wastes disposal, such as the sanitary landfills, have demanded the development of new technologies. Additionally, the lack of areas for waste disposal near to urban centers has led to vertical expansions of the existing sanitary landfills and, consequently, more rigorous stability analyses. Thus, the study of the mechanical behavior of the wastes becomes very important, especially, the shear strength. The present work aims to contribute to the understanding of the mechanical behavior of municipal solid wastes, through the construction of a large dimension direct shear equipment and the accomplishment of an experimental program to evaluate the shear strength of municipal solid wastes. The tests were carried out in samples with different initial conditions of composition, unit weight and moisture content, and age. Specific objectives of this work are to verify the Mohr-Coulomb failure criteria validity and to evaluate qualitatively the model proposed by Kolsch (1993 and 1995), which has shown to be more appropriate for municipal solid wastes. Besides the description of the developed equipment, the curves of shear stress versus horizontal displacement, strength envelopes and strength parameters variation with horizontal displacement are presented. The behavior of all the tested samples was characterized by a continuous strength gain without failure identification. The presence of fibrous materials led to a significant strength increase in relation to the samples without fibers. The strength parameters values (friction angle and cohesive intercept) were located inside the range presented in the literature. In respect to the Mohr-Coulomb envelope validity, it was verified that the samples with low fiber contents presented a linear failure criterion. The samples with high fiber contents presented a trend of a bi-linear failure criterion. The equipment developed and used in the tests and the used methodology shown to be appropriate.
Nos últimos anos, no Brasil e no exterior, em função de uma maior rigidez da legislação ambiental, o projeto e a operação de instalações seguras para a disposição de RSU, como os aterros sanitários, têm demandado o desenvolvimento de novas tecnologias. Aliado a isto, a escassez de grandes áreas próximas aos centros urbanos para disposição de RSU tem induzido o processo de verticalização dos aterros sanitários e, conseqüentemente, um maior rigor nas análises de estabilidade desses empreendimentos. Nota-se, desta forma, a importância de estudar o comportamento mecânico dos resíduos, em especial, a resistência ao cisalhamento. O presente trabalho tem como objetivo contribuir para o entendimento do comportamento mecânico dos resíduos sólidos urbanos, por meio da construção de um equipamento de cisalhamento direto de grandes dimensões e da realização de um programa experimental para avaliação da resistência dos resíduos sólidos urbanos. Os ensaios foram realizados em amostras com diferentes condições de composição, peso específico e umidade iniciais, e idade. Um dos objetivos específicos deste trabalho é verificar a validade do critério de ruptura de Mohr-Coulomb e avaliar qualitativamente a validade do modelo geotécnico proposto por Kolsch (1993 e 1995), o qual tem se mostrado mais apropriado para os resíduos sólidos urbanos. Além da descrição do equipamento desenvolvido, são apresentadas as curvas tensão cisalhante versus deslocamento horizontal, as envoltórias de resistência e a variação dos parâmetros de resistência com o deslocamento horizontal dos ensaios realizados. O comportamento de todas as amostras ensaiadas caracterizou-se por um contínuo ganho de resistência sem a identificação de ruptura. A presença de materiais fibrosos conferiu significativos ganhos de resistência, em relação às amostras sem fibras. Os valores dos parâmetros de resistência (ângulo de atrito e intercepto coesivo) situaram-se dentro da faixa apresentada na literatura. No que diz respeito à validade da envoltória de Mohr-Coulomb, constatou-se que as amostras cujas composições possuíam baixo percentual de materiais fibrosos apresentaram um critério de ruptura linear. Já as amostras cujas composições possuíam alto percentual de materiais fibrosos apresentaram uma tendência a um critério de ruptura bi-linear. O equipamento construído e utilizado nos ensaios e a metodologia empregada mostraram-se adequados.
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Catapreta, Cicero Antonio Antunes. « Comportamento de um aterro sanitário experimental : avaliação da influência do projeto, construção e operação ». Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/FRPC-7NXGDZ.

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The accomplishment of research concerning the urban solid waste characterization and sanitary landfills behavior is of great relevance, considering the importance and safety requirements of these structures. In this context, the present work aimed to investigate the influence of operational issues, mainly those concerning waste compaction, in the behavior of sanitary landfills. The study was carried out with the construction and monitoring of an Experimental Sanitary Landfill for urban solid wastes disposal, operating in real scale. The study also aimed at evaluating the mechanical behavior of the Experimental Sanitary Landfilland the evolution of the physical and chemical parameters of the leachate and gases generated, as well as evaluating the water balance and the performance of the landfill final cover. In general, the study demonstrated that the operational procedures influenced the behavior of Experimental Sanitary Landfill. The compaction study indicated that the compacted waste density is influenced directly by the inclination of the compaction slope and the number of passes of the compactor equipment. The lower densities were obtained with the small inclinations and numbers of the passes. In the same way larger densities were obtained with higher number of passes. It was also verified that the increase in waste densities were not significant when more passes of the equipments were used. The compressibility study evidenced the influence of the initial densities in the waste settlements. The observed difference between the results of the long term settlement models suggests that the modelsmust be used together, for the definition of settlement ranges. The evapotranspirative and capillary barriers final covers presented good performances, indicating the possibility of using alternative materials with lower costs. Concerning the water balance, the field data indicatedthe limitations of the conceptual model used and had confirmed a relationship between the precipitation and the level and content of leachate inside the landfill, as well as the discharges. The study of the leachate evolution, associated wiht the results of the gases monitoring,indicated that the landfill entered the methanogenic phase one hundred days after the end of the waste disposal. The study indicated the influence of the precipitation in the evolution of the physical and chemical leachate parameters, suggesting the importance of the accomplishment of the analysis of the behavior of these parameters in terms of bothconcentration and effluent load.
A realização de pesquisas e estudos relacionados à caracterização dos resíduos sólidos urbanos e ao entendimento do comportamento de aterros sanitários é de grande relevância, dada a importância e a segurança que estas obras exigem. Neste contexto, o presente trabalho objetivou investigar a influência de variáveis operacionais, principalmente as relacionadas à compactação dos resíduos, no comportamento de aterros sanitários. O estudo foi realizado a partir da implantação e monitoramento de um Aterro Sanitário Experimental para disposição de resíduos sólidos urbanos, operando em escala real. O estudo teve ainda como objetivos, avaliar o comportamento mecânico do Aterro Sanitário Experimental e a evolução temporal dos parâmetros físico-químico dos líquidos lixiviados e gases gerados, assim como avaliar o balanço hídrico e o desempenho das camadas de cobertura final. De maneira geral, o estudo demonstrou que os procedimentos operacionais influenciaram o comportamento do Aterro Sanitário Experimental. O estudo da compactação indicou que a peso específico dos resíduos compactados é influenciada diretamente pela inclinação da rampa de compactação e pelo número de passadas do equipamento compactador. Os maiores pesos específico foram obtidos com as menores inclinações e menores números de passadas. Da mesma forma pesos específicos maiores foram obtidos com um número maior de passadas. Verificou-se ainda que para um número mais elevado de passadas, o ganho em termos de peso específico é pequeno. O estudo da compressibilidade evidenciou a influência dos pesos específicos iniciais nos recalques. A diferença observada entre os resultados dos modelos de previsão de recalques sugere que os mesmos devam ser utilizados de forma conjunta, para a definição de faixas de recalques. As camadas de cobertura final do tipo evapotranspirativa e barreira capilar apresentaram desempenho adequado, indicando a possibilidade de utilização de materiais alternativos e de menor custo. Em relação ao balanço hídrico, os dados de campo indicaram as limitações do modelo conceitual utilizado e confirmaram uma relação entre a precipitação pluviométrica e o nível e volume de líquidos lixiviados no interior do aterro e as vazões. O estudo da evolução temporal dos líquidos lixiviados, associado ao monitoramento de gases, indicou que o aterro entrou na fase metanogênica cem dias após o final da aterragem. O estudo indicou a influência da precipitação pluviométrica na evolução dos parâmetros físicoquímicos dos líquidos lixiviados e mostrou a importância da realização da análise do comportamento desses parâmetros tanto em termos de concentração quanto da carga efluente.
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Livres sur le sujet "FRCC"

1

Agopian, Ștefan. Fric. București : Polirom, 2003.

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C, Pearce Adrian, et Moscuzza Franco, dir. FRCA : MCQs for the primary FRCA. London : Saunders, 1999.

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FRCA : MCQs for the final FRCA. Edinburgh : W.B. Saunders Co., 1998.

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Siddiqui, Muhammad Rafay Sameem. Higher FRCS. Boca Raton : CRC Press, 2023. http://dx.doi.org/10.1201/9781003221234.

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Clément, Patrick. Africa fric. Paris : L'Echo des Savanes/Albin Michel, 1988.

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Rabone, Amanda, Benedict Thomson, Nicky Dineen, Vincent Helyar et Aidan Shaw. The Final FRCR. First edition. | Boca Raton, FL : CRC Press, 2021. : CRC Press, 2020. http://dx.doi.org/10.1201/9780429195327.

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Butler, Paul, Charles G. Blakeney, Alan Brooks et Robert Speller. FRCR Part I. London : Springer London, 1991. http://dx.doi.org/10.1007/978-1-4471-1791-9.

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L'A-fric : Roman. Yaoundé : Presses universitaires de Yaoundé, 2008.

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T, Willan Peter L., dir. Passing the FRCS. London : Butterworths, 1989.

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Society of Petroleum Engineers (U.S.), dir. Frac packing handbook. Richardson, TX : Society of Petroleum Engineers, 2009.

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Chapitres de livres sur le sujet "FRCC"

1

Del Vecchio, Ciro, Marco Di Ludovico et Andrea Prota. « Design Procedure for the FRCC Strengthening of Beam-Column Joints ». Dans Lecture Notes in Civil Engineering, 1895–903. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88166-5_163.

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Kanri, Miyu, Tomoya Nishiwaki et Masafumi Kitatsuji. « Fundamental Study on Mechanical Performances of FRCC Using Polypropylene Nanofibers ». Dans RILEM Bookseries, 53–61. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-15805-6_6.

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Paegle, I., et G. Fischer. « Shear Crack Formation and Propagation in Fiber Reinforced Cementitious Composites (FRCC) ». Dans High Performance Fiber Reinforced Cement Composites 6, 231–38. Dordrecht : Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-2436-5_28.

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Del Zoppo, Marta, Marco Di Ludovico, Alberto Balsamo, Andrea Prota et Giulio Morandini. « RC Columns Upgrade : Opportunities Given by FRP and Potential of FRCC Systems ». Dans Lecture Notes in Civil Engineering, 1862–73. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88166-5_160.

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Zhang, Hang, et Toshiyuki Kanakubo. « Influence of Placing Thickness on Fiber Orientation and Bridging Law of FRCC ». Dans RILEM Bookseries, 91–97. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-15805-6_10.

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Nishiwaki, Tomoya, Sukmin Kwon, Hiroto Otaki, Go Igarashi, Faiz U. A. Shaikh et Alessandro P. Fantilli. « Experimental Study on Time-Dependent Behavior of Cracked UHP-FRCC Under Sustained Loads ». Dans RILEM Bookseries, 101–9. Dordrecht : Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-024-1001-3_9.

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Mu, Yu, Mai Ando, Akira Yasojima et Toshiyuki Kanakubo. « Influence of Fiber Orientation on Structural Performance of Beam-Column Joints Using PVA FRCC ». Dans Strain-Hardening Cement-Based Composites, 465–72. Dordrecht : Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_54.

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Jin, Qingxu, et Christopher K. Y. Leung. « Fiber Reinforced Cementitious Composites (FRCC) Plate for the Anchoring of FRP Sheet on Concrete Member ». Dans Advances in FRP Composites in Civil Engineering, 53–56. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17487-2_8.

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Kanakubo, Toshiyuki, Keisuke Watanabe et Yuriko Ozu. « Simulation of Scattering of Bending Characteristics of FRCC Based on Bridging Law Considering Fiber Distribution ». Dans Strain-Hardening Cement-Based Composites, 509–17. Dordrecht : Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_59.

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Balsamo, Alberto, Marco Di Ludovico, Maddaloni Gennaro, Andrea Prota et Luca Albertario. « Experimental Investigation on Full Scale Cast in Place R.C. Floor Strengthened with FRCC Strengthening Technique ». Dans Lecture Notes in Civil Engineering, 1851–61. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88166-5_159.

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Actes de conférences sur le sujet "FRCC"

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Del Zoppo, Marta, Marco Di Ludovico et Andrea Prota. « SHEAR CAPACITY MODELS FOR RC COLUMNS WITH FRCC JACKETING ». Dans 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Athens : Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2019. http://dx.doi.org/10.7712/120119.6980.18860.

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Mercedes, Luis, Lluis Gil et Ernest Bernat. « Comportamiento mecánico de compuestos de matriz cementicia y tejidos de fibras vegetales ». Dans HAC2018 - V Congreso Iberoamericano de Hormigón Autocompactable y Hormigones Especiales. Valencia : Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/hac2018.2018.5501.

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Los compuestos cementicios reforzados con fibras en forma de tejidos (fibre reinforced cementitious composite: FRCC) han demostrado ser un material de refuerzo con un prometedor futuro, debido a su facilidad de aplicación, resistencia al fuego y su capacidad de disipar energía a través de un patrón de multifisuras. El auge que viene desarrollando el uso de fibras vegetales como refuerzo dentro de los materiales compuestos debido a su bajo costo, baja densidad, reciclabilidad y biodegradabilidad, hace que estas fibras se presenten como una opción de refuerzo a considerar dentro los compuestos cementicios. En este estudio se han elaborado especímenes FRCC de diferentes fibras vegetales (lino, cáñamo, sisal y algodón), utilizando un tratamiento a base de poliéster para evitar la degradación de las fibras y mejorar su eficacia dentro de la matriz alcalina de los compuestos cementicios. Los resultados han mostrado una excelente interacción entre los tejidos y la matriz utilizada, pues el poliéster además mejorar las propiedades mecánicas de los hilos y proteger las fibras frente a la alcalinidad de la matriz, aumenta la adherencia con esta, y con ello mejora las prestaciones mecánicas del FRCC. Donde los resultados presentan las fibras de lino y cáñamo (por sus mejores propiedades mecánicas frente a otras fibras vegetales) como las fibras vegetales con mayor futuro dentro de los materiales compuestos.DOI: http://dx.doi.org/10.4995/HAC2018.2018.5501
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Lei, Dongdong. « Experimental Study On Seismic Resistance Of PVA-FRCC Medium - Long Column With Reinforcement Under Low Cyclic Load ». Dans 2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR). IEEE, 2021. http://dx.doi.org/10.1109/ichceswidr54323.2021.9656409.

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Majdi, Hamed, et Zongjin Li. « Mechanical and Thermal Insulation Properties of High Volume Fly Ash Fiber Reinforced Cement Composite (HVFA-FRCC) Manufactured by Extrusion Technique ». Dans Fourth International Conference on Sustainable Construction Materials and Technologies. Coventry University, 2016. http://dx.doi.org/10.18552/2016/scmt4s152.

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Salzer, Peter, Václav Hanušík et Kristína Krištofová. « Disposal of Non-Standard Radioactive Waste in the Mochovce L/ILW Repository ». Dans ASME 2001 8th International Conference on Radioactive Waste Management and Environmental Remediation. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/icem2001-1188.

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Abstract Packages of the non-standard radioactive waste have been, in present conditions of the Slovak Republic, defined as packages intended to be dispose by the producer and originally not covered by “the limits and conditions” of the Mochovce near surface repository, particularly waste acceptance criteria concerning the form of waste. Wastes cemented directly (homogeneous) to standard concrete containers reinforced by metal fibres (FRCs) or conditioned into 2001 drums before (heterogeneous: drums are inserted into FRCs and the FRCs void spaces are filled by cement mortar) were originally the only acceptable radioactive waste form in Mochovce repository. However, there has been an intention to dispose another, so-called “non-standard” types of waste: large metal pieces of waste transported and placed directly into repository vaults (i.e. cut into dimensions of individual vault). Second types of non-standard waste have been: dewatered spent ion exchange resins and storage tanks bottom sludge in drums, inserted into FRC with subsequent backfilling by cement mortar. Third group of these is represented by incinerator ashes in drums inserted to FRC directly or after compaction, again with subsequent backfilling of FRCs void spaces. As an answer for this challenge, the ALARA approach has been applied for pre-disposal management optimization of large metal pieces of waste. Four examples of waste arising from the Slovak decommissioned plant A-1 have been evaluated for various options of its management. This step is predominant to achieve a decision concerning disposal of the latter kind of waste. Regarding the disposal of mentioned dewatered waste and incinerator ashes in FRC, a new model has been applied to the assessment of long-term behavior of source term in the repository safety analyses. The new approach is sensitive to the form of waste package on the contrary to the source term model applied heretofore.
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Li, Lei, Wei Peng, Saurabh Kataria, Tong Sun et Tao Li. « FRec ». Dans the 22nd ACM international conference. New York, New York, USA : ACM Press, 2013. http://dx.doi.org/10.1145/2505515.2505645.

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Ramos, I., Y. H. Park et J. Ulibarri-Sanchez. « Stress and Damage Analysis of Fiber-Reinforced Composite Pipe ». Dans ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84673.

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Composite materials are used in many environments due to their special properties such as high strength-to-weight ratio, corrosion resistance and the ability to be tailored to specific requirements. In particular, the use of fiber reinforced composites (FRCs) for pressure vessels/pipes has increased in structural applications such as fuel tanks, pipes, vessels, and rocket motor cases. Assessing failure conditions is important to ensure that these structures do not fail under their operating condition. In this study, an analytical procedure is developed to predict the fatigue behavior of FRC. A numerical model will also be developed and applied to failure analysis under internal pressure loading.
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Asadi, Mahmoud, Robert A. Woodroof et Jerry Donald Dumas. « Post-Frac Analysis Based on Flowback Results Using Chemical Frac-Tracers ». Dans International Petroleum Technology Conference. International Petroleum Technology Conference, 2008. http://dx.doi.org/10.2523/iptc-11891-ms.

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Asadi, M., R. A. Woodroof et J. D. Dumas Jr. « Post-Frac Analysis Based on Flowback Results Using Chemical Frac-Tracers ». Dans IPTC 2008 : International Petroleum Technology Conference. European Association of Geoscientists & Engineers, 2008. http://dx.doi.org/10.3997/2214-4609-pdb.148.iptc11891.

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Schmelzl, Eric, Daniel Schlosser, Domingo Alvarez et Dale Gulewicz. « CTU Deployed Frac Sleeves Benchmark Horizontal Multi Stage Frac Isolation Performance ». Dans SPE Western North American and Rocky Mountain Joint Meeting. Society of Petroleum Engineers, 2014. http://dx.doi.org/10.2118/169574-ms.

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Rapports d'organisations sur le sujet "FRCC"

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George, S. A., et Genliang Guo. User's Manual Frac-Explore 2.0. Office of Scientific and Technical Information (OSTI), mars 1999. http://dx.doi.org/10.2172/4111.

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Collins, D., et J. West. FRAC-IN-THE-BOX utilization. Office of Scientific and Technical Information (OSTI), juin 1989. http://dx.doi.org/10.2172/5291580.

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Clemo, T. M., J. D. Miller, L. C. Hull et S. O. Magnuson. FRAC-UNIX theory and user's manual. Office of Scientific and Technical Information (OSTI), mai 1990. http://dx.doi.org/10.2172/7151973.

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Grother, Patrick, Mei Ngan, Kayee Hanaoka, Chris Boehnen et Lars Ericson. The 2017 IARPA face recognition prize challenge (FRPC). Gaithersburg, MD : National Institute of Standards and Technology, novembre 2017. http://dx.doi.org/10.6028/nist.ir.8197.

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Krall, N. A. A program of FRC theory research. Office of Scientific and Technical Information (OSTI), mai 1990. http://dx.doi.org/10.2172/5147898.

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Fight, Roger D., Bruce R. Hartsough et Peter Noordijk. Users guide for FRCS : fuel reduction cost simulator software. Portland, OR : U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2006. http://dx.doi.org/10.2737/pnw-gtr-668.

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Caldwell, Della, Mitchell Brouse, Raymond Heitner et David Sweeney. Frac-Sand Mining in Winneshiek County : A Comprehensive Impact Study. University of Iowa, mai 2015. http://dx.doi.org/10.17077/a7mk-et2r.

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Sotelino, Elisa, et Ming-Hung Teng. Strengthening of Deteriorating Decks of Highway Bridges in Indiana Using FRPC. West Lafayette, IN : Purdue University, 2002. http://dx.doi.org/10.5703/1288284313325.

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Liu, Guoxiang, Xiongjun Wu et Vyacheslav Romanov. Machine Learning Application for Frac-Hit Identification : Field Data Use Case. Office of Scientific and Technical Information (OSTI), octobre 2022. http://dx.doi.org/10.2172/1893843.

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E.V. Belova, R.C. Davidson, H. Ji et M. Yamada. Nonlinear and Non-ideal Effects on FRC Stability. Office of Scientific and Technical Information (OSTI), octobre 2002. http://dx.doi.org/10.2172/809930.

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