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Letteratura scientifica selezionata sul tema "Cementious materials"

Autore: Grafiati

Pubblicato: 31 agosto 2024

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Articoli di riviste sul tema "Cementious materials"

Uma Maheshwari, K., e N. Venkat Rao. "Effect of Cementious Materials on Corrsion in Carbonated Concrete". IOP Conference Series: Earth and Environmental Science 1086, n. 1 (1 settembre 2022): 012003. http://dx.doi.org/10.1088/1755-1315/1086/1/012003.

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Abstract Reinforced Concrete(RC) is an world wide used material than any other man made material in construction. Today civil engineers are facing a major issue with corrosion in RC. The usage of cementious material in concrete prevents the economics loss and damage of structure. Under condition of carbonated concrete, the quantification of corrosion is determined by using condition evaluation methods like galvanostatic method. By using cementious substances like Silica Fume(SF), Ground Granulated Blast Furnace Slag (GGBS), the galvanostatic method will catalyze long lasting and sustainable concrete for the assessment of carbonation induced corrosion. This paper mainly reports on the study of Corrosion Assessment in carbonated and non carbonated specimens. This investigation includes four series (one carbonated and three non-carbonated) of cubes and beams in standard sizes. The reinforcement provided with 12mm diameter as main reinforcement and 8mm diameter as vertical stirrups. The proportions includes M30 Grade of concrete with GGBS (50%), Silica Fume(3%, 5%,10%) as a cement replacements along with superplasticizers. The methodology was adopted by conducting various test like flexural strength, compressive strength, corrosion rate, degree of corrosion, carbonation depth. The results found were effective, as flexural strength and compressive strength were increased due to the addition of cementious materials, where as carbonation depth and corrosion rate decreased.

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Xie, Guo Hua, He Qing Du, Shu Jing Zhu e Yong Jie Xue. "Novel Cementious Materials from Industrial Solid Waste for Silt Soil Solidification". Advanced Materials Research 150-151 (ottobre 2010): 711–18. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.711.

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Four kinds of industrial solid waste, granulated blast furnace slag (GBFS), electric furnace steel slag (EFSS), semi-dry flue gas desulfurization slag (FGDS) and gypsum were activated by mechanochemistry to prepare a novel kind of cementious material, DA type soil solidification agent (DA agent). Compared to the traditional cementious materials, this paper evaluated DA agent used in silt soil solidification project. Test results showed that DA-4 was prepared with adding the 40% CFBA, 39% GBFS, 11% OPC clinker and 10% gypsum by mill and more superior in material characteristics. It was found that compressive strength of DA-4 paste and mortar specimens at 28-days cured age were 46.0 and 27.3 MPa respectively; 5% of DA-4 was used to stabilize the silt soil in lab and the maximum dry unit weight, optimum moisture content, unconfined compressive strength and CBR value were 1.754 g/cm3, 15.35%, 1.15 MPa and 95.5% respectively. The hardening mechanism of prepared cementious materials is explained by two points: the sulfite or sulfate activation on alkali blast furnace slag; and the hydration product produced from cement clinker hydration process. Besides test programs of the trial pavement section in site showed that stabilized and solidified silt soils by DA-4 can meet the requirement of subgrade of pavement for strength and stiffness.

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Wang, Kang, Yu Ping Zhang, Ting Wei Cao, Jie Zhang e Zhong He Shui. "Effect of Modified Metakaolin on Water Content of Hardened Cementitious Materials of Concrete". Key Engineering Materials 599 (febbraio 2014): 29–33. http://dx.doi.org/10.4028/www.scientific.net/kem.599.29.

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The effect of modified metakaolin (MMK) on the evaporable water and chemically bound water content of hardened cementitious materials have been investigated. Concrete specimens with 0%, 4%, 7% and 10% of MMK were included. Metakaolin was pre-modified in order to increase the dispersion and contact angle, which might further improve the workability of the concrete. The experimental results showed that both the evaporable water and bound water were increased with the increasing of the MMK content. MMK has a special layered structure. Water can get into the layers through this special layer during the mixing of concrete specimens. Part of MMK with water between the layers didn’t participate in the hydration reaction at the early stage of the hydration, which increased the evaporable water of the cementious materials. The water absorbed in MMK will be released to promote the formation of hydration products and thus the chemically bound water content will increase continuously at the later stages. It also reduced the autogenous shrinkage of the specimens which caused by the decrease of water in capillary pores at low water cement ratio (0.3).

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Niu, Hui, Kai Yang, Ke Bin Zhao e Huan Zheng Chi. "Experimental Study on Improving the early Strength of Fly Ash Concrete". Advanced Materials Research 168-170 (dicembre 2010): 1943–46. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1943.

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This manuscript makes experiments on the macroscopic concrete strength improvement of fly ash activation at early age. At the same time we test the microstructure of fly-ash waste residue concrete cementious materials and calculus, analyzing HPC preliminary mechanism tentatively. The mechanism of improving the early concrete strength by fly ash activation is expatiated, which improves activation mechanism and technology of fly ash.

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Sharkawi, Aladdin M., Metwally A. Abd-Elaty e Omar H. Khalifa. "Synergistic influence of micro-nano silica mixture on durability performance of cementious materials". Construction and Building Materials 164 (marzo 2018): 579–88. http://dx.doi.org/10.1016/j.conbuildmat.2018.01.013.

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FUKUSHIMA, Yuta, Takayasu ITO, Masashi OSAKI e Tsuyoshi SAITO. "APPLICATION OF CALCINED CLAY CONTAINING ALLOPHANE AND HALLOYSITE AS A SUPPLYMENTARY CEMENTIOUS MATERIALS". Cement Science and Concrete Technology 77, n. 1 (29 marzo 2024): 550–57. http://dx.doi.org/10.14250/cement.77.550.

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Wang, Xue, e Yuan Chen Guo. "A Summary of Strength Formation Mechanism of Light Wall Material". Applied Mechanics and Materials 217-219 (novembre 2012): 1099–102. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.1099.

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The lisht wall material is one of the major trends of wall materials currently Light weight wall material is made of active mineral powder as a main raw material and P. O cement as a cementious material. Spent foam plastic and some admixtures were added, foamed and cured in the nature under the ordinary temperature and pressure condition. The article introduces and analyzes exhaustively the strength mechanism of lisht wall material and prepares theoretical basis for the preparation of high-strength lisht wall material.

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Wang, Xue, e Yuan Chen Guo. "Experimental Research on Strengthen Mechanism of NaOH on Light Wall Materials Prepared from Crushed Brick Powder". Advanced Materials Research 535-537 (giugno 2012): 1657–60. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1657.

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Crushed brick light weight wall material, which was made of crushed brick as a main raw material and P•S cement as a cementious material. Crushed foam glass and some admixtures were added, is prepared under the ordinary temperature and pressure condition. The main research in this paper is if NaOH has good alkaline excitation on crushed brick light weight wall material through experimental research and mechanism analysis. Studies have shown that: (1) The main chemical composition of crushed brick powder are SiO2 and Al2O3, crushed brick powder have a certain activity.(2) NaOH releases the activity of the internal soluble SiO2 and Al2O3.(3) In this experiment system, when the caustic soda content is about 3%, there has been an obvious peak of compressive strength.

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She, An Ming, Wu Yao e Wan Cheng Yuan. "Evolution of Various States of Water in Blended Cementitious Materials". Applied Mechanics and Materials 193-194 (agosto 2012): 389–92. http://dx.doi.org/10.4028/www.scientific.net/amm.193-194.389.

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Low field NMR, as a nondestructure and noninvasive method was employed to study the evolution of various states of water in blended cementious materials added with fly ash during hydration from 1 day to 100 days. The relative content of water held in series of pores in cement matrix, e.g. capillary pore, mesopore and gel pore, was determined based on the quantitative relationship between transverse relaxation time, T2, and pore dimension. The results indicated that the relative content of chemically bound water was higher at long-term cure of 100 days compared with the neat cement paste. The water distributed in various pores was also influenced by the pozzolanic reactions between fly ash and calcium hydroxide. The gel water and mesopore water increased dramatically during the short-term age of 1 to 7 days in blended matrix, but then decreased gradually after 28 days, unlike that in pure cement paste. Due to the lower hydration degree in blended matrix, there was still amount of capillary water residual in paste to supply for the further hydration of fly ash.

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Li, Xiong Hao, Yong Jie Xue e Min Zhou. "Experimental Study on Utilization FGD Byproducts in Building Bricks". Advanced Materials Research 150-151 (ottobre 2010): 753–57. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.753.

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This paper discussed the feasibility of unburned and non-autoclaved, steam cured bricks prepared by FGD byproducts from coal-fired power plants. The results show that FGD byproduct, aggregates, cementious materials and water could be used to prepare bricks during the process of stir and compaction under natural cure and steam cured condition. S4 and Z2 are the optimum design mixture composition. The maximum compressive strength and saturation coefficient are 28.7 MPa and 96.7%. FGD byproducts do no harm to environment and a pilot-scale experiment demonstrates that bricks made with FGDA can meet the MU10 level bricks technical requirement.

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Tesi sul tema "Cementious materials"

Danché, Valentine. "Impression 3D par liaison sélective de béton de chanvre". Electronic Thesis or Diss., CY Cergy Paris Université, 2024. http://www.theses.fr/2024CYUN1286.

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L'impression 3D connaît un essor remarquable dans l'industrie de la construction, ouvrant la voie à la digitalisation attendue du secteur. Alors que de nouvelles techniques sont étudiées pour associer optimisation technique et limitation des émissions de CO2, cette étude se concentre sur l'impression 3D par lit de poudre. Encore relativement niche, cette technique pourrait permettre d'imprimer avec une forte teneur en fibres naturelles, franchissant ainsi une étape supplémentaire vers la neutralité carbone. Le processus est simple, impliquant trois étapes répétées : déposer une couche de poudre réactive - compacter - injecter de l'eau sur la surface.Par conséquent, contrôler la pénétration de l'eau dans la poudre est la clé pour améliorer la qualité d'impression. Pour confiner l'eau dans la zone désirée et permettre une hydratation optimale du liant, nous avons modifié les propriétés physiques de la poudre (compacité, perméabilité) ou celles du fluide injecté (tension superficielle, viscosité, limite d'écoulement) pour étudier leur impact sur la cinétique de propagation de l'eau en surface et dans la poudre. Nous avons donc étudié la cinétique de propagation verticale d'eau dans des échantillons de poudres cimentaires compactées. Pour mieux s'approcher des phénomènes advenant dans l'imprimante, l'imbibition verticale dans les deux sens de pénétration est suivie par analyse d'image et par IRM, bénéficiant ainsi d'informations complémentaires sur la quantité et la répartition de l'eau dans les échantillons.Après avoir développé un dispositif ambivalent, nous avons étudié des poudres pures (ciment, calcite, métakaolin, sable) et d'autres contenant des agrégats poreux (pâte de ciment recyclée ou chanvre micronisé) pour mieux comprendre leur impact sur la pénétration de l'eau dans une poudre imprimable biosourcée. En effet, cette technique apporte de nouvelles pistes de compréhension sur la saturation et, combinée à la RMN, les transferts d'eau entre la matrice et les agrégats poreux. Les agrégats poreux naturels comme le chanvre sont en effet bien connus pour interférer sur la répartition de l'eau car ils absorbent et gonflent au contact de l'eau. Les résultats indiquent que la cinétique ne ralentit pas toujours avec le temps et nous amènent à discuter de la validité de la loi de Washburn, pourtant communément utilisé pour décrire les phénomènes de propagation d'eau dans des milieux poreux.Enfin, le développement complet d'une imprimante 3D sur lit de poudre a permis d'imprimer des cubes qui permettront d'étudier l'influence du choix des paramètres d'impression (type d'injection et compacité) sur la forme des pièces. Nous pourrons ensuite envisager de considérer les matériaux biosourcés comme un outil possible pour améliorer la précision d'impression
3D printing is experiencing a significant rise in the construction industry, paving the way for the expected digitalization of the sector. As new techniques are explored to combine technical optimization and CO2 emission reduction, this study focuses on powder-bed 3D printing. Despite still being relatively niche, this method could facilitate printing with a high natural fiber content, thus taking a further step towards carbon neutrality. The process is simple, involving three iterative steps : depositing a layer of reactive powder, compacting it, and then injecting water onto the surface.Hence, controlling water penetration into the powder is crucial to improve print quality. The objective is to confine the available water to the desired area, ensuring optimal binder hydration and preventing leaching from previous layers. Several factors may limit penetration depth, including the physical properties of the powder (compactness, permeability) and those of the injected fluid (surface tension, viscosity, yield stress) to study their impact on the kinetics of water propagation on the surface and within the powder. Consequently, we examined the vertical water propagation kinetics in compacted cementitious powder samples. To better simulate the phenomena occurring within the printer, vertical imbibition in both penetration directions was monitored through image analysis and MRI, providing additional insights into the quantity and distribution of water in the samples.Following the development of a versatile setup, we investigated pure powders (such as cement, calcite, metakaolin, sand) and those containing porous aggregates (recycled cement paste or micronized hemp shives) to better understand their impact on water penetration in a bio-sourced printable powder. Indeed, this technique sheds new light with a saturation sensibility and, when combined with MRI, water transfers between the matrix and porous aggregates. Natural porous aggregates like hemp are well-known to affect water distribution as they absorb and swell on contact with water. The results indicate that kinetics do not always slow down over time which opens discussions on the validity of Washburn's Law, commonly used to describe water propagation phenomena in porous media.Finally, the complete development of a powder-bed 3D printer has enabled the printing of cubes, which will facilitate the study of the influence of printing parameter choices (injection type and compactness) on part geometry. We will then be able to consider biobased materials as a possible tool for improving printing precision

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Houk, Alexander Nicholas. "SELF-SENSING CEMENTITIOUS MATERIALS". UKnowledge, 2017. https://uknowledge.uky.edu/ce_etds/58.

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The study of self-sensing cementitious materials is a constantly expanding topic of study in the materials and civil engineering fields and refers to the creation and utilization of cement-based materials (including cement paste, cement mortar, and concrete) that are capable of sensing (i.e. measuring) stress and strain states without the use of embedded or attached sensors. With the inclusion of electrically conductive fillers, cementitious materials can become truly self-sensing. Previous researchers have provided only qualitative studies of self-sensing material stress-electrical response. The overall goal of this research was to modify and apply previously developed predictive models on cylinder compression test data in order to provide a means to quantify stress-strain behavior from electrical response. The Vipulanandan and Mohammed (2015) stress-resistivity model was selected and modified to predict the stress state, up to yield, of cement cylinders enhanced with nanoscale iron(III) oxide (nanoFe2O3) particles based on three mix design parameters: nanoFe2O3 content, water-cement ratio, and curing time. With the addition of a nonlinear model, parameter values were obtained and compiled for each combination of nanoFe2O3 content and water-cement ratio for the 28-day cured cylinders. This research provides a procedure and lays the framework for future expansion of the predictive model.

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Isaacs, Ben. "Self-healing cementitious materials". Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/54220/.

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A general conclusion from the work is that both systems require considerable development before being ready for industrial application. However, of the two systems investigated, it is the latter which shows the greatest potential to not only greatly enhance the durability of cementitious composites, but also to improve their strength and ductility.

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Pheeraphan, Thanakorn. "Microwave curing of cementitious materials". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12174.

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Peach, Benjamin. "Laser scabbling of cementitious materials". Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/11853/.

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Laser scabbling of concrete is the process by which the surface layer of concrete may be removed through the use of a high power (low power density) laser beam. The aim of this study was to investigate the mechanism(s) responsible for laser scabbling. This was achieved in three stages. The first stage was a test series used to establish an experimental procedure for assessing the effects of various parameters that may be critical for the effectiveness of the process, such as material composition and initial moisture content. The second stage was a test series investigating the effect of concrete composition on laser scabbling. The first two test series identified that the driving force of laser scabbling in concretes originates from the mortar, therefore, the third test series concentrated on the factors that influence laser scabbling of mortars. Throughout the study, infra red recordings have been used to quantify laser scabbling behaviour, along with the volume removal due to laser scabbling and characterisation techniques such as XRF, DTA and TGA. The results suggest that scabbling is mainly driven by pore pressures, but strongly affected by other factors. The removal of free water from mortars prohibits scabbling, but resaturation allows mortar to scabble. A reduced permeability, either due to a reduction in the water/binder ratio or the use of 25% PFA replacement, enhances laser scabbling. Results show that the biggest effect of ageing is due to specimens drying. Mortars and cement pastes were seen to scabble at a constant rate, whereas concretes experienced a peak rate, after which volume removal reduced dramatically. Basalt aggregate concrete was less susceptible to laser scabbling than limestone aggregate concrete due to vitrification. A higher fine aggregate content increases volume removal and fragment sizes during laser scabbling.

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Brown, Nicholas John. "Discrete element modelling of cementitious materials". Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8011.

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This thesis presents a new bonded particle model that accurately predicts the wideranging behaviour of cementitious materials. There is an increasing use of the Discrete Element Method (DEM) to study the behaviour of cementitious materials such as concrete and rock; the chief advantage of the DEM over continuum-based techniques is that it does not predetermine where cracking and fragmentation initiate and propagate, since the system is naturally discontinuous. The DEM’s ability to produce realistic representations of cementitious materials depends largely on the implementation of an inter-particle bonded-contact model. A new bonded-contact model is proposed, based on the Timoshenko beam theory which considers axial, shear and bending behaviour of inter-particle bonds. The developed model was implemented in the commercial EDEM code, in which a thorough verification procedure was conducted. A full parametric study then considered the uni-axial loading of a concrete cylinder; the influence of the input parameters on the bulk response was used to produce a calibrated model that has been shown to be capable of producing realistic predictions of a wide range of behaviour seen in cementitious materials. The model provides useful insights into the microscopic phenomena that result in the bulk loading responses observed for cementitious materials such as concrete. The new model was used to simulate the loading of a number of deformable structural elements including beams, frames, plates and rings; the numerical results produced by the model provided a close match to theoretical solutions.

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Rad, Taghi. "Microstructural characteristics of recycled cementitious materials". Thesis, University of Hertfordshire, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340038.

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Bolton, Mark William. "Soil Improvement Using Optimised Cementitous Materilas Design". Thesis, Griffith University, 2014. http://hdl.handle.net/10072/365243.

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This thesis provides a detailed study on optimisation of cementitous treated soft clay soils in the South East Queensland region. A comparative study has been performed comparing the behaviour of cement and lime treated compressible clays from both Bangkok and South East Queensland. The purpose of the comparative study was to evaluate change in strength properties of treated soft clay soil as well as providing parameters for case studies using different analysis methods. This thesis compares the behaviour of soft clay treated with cementitous materials in South East Queensland and Bangkok. Overall it was concluded that the addition of cement and lime has favourable effects on the strength characteristics of South East Queensland soft clays.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
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Mihai, Iulia. "Micromechanical constitutive models for cementitious composite materials". Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/24624/.

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A micromechanical constitutive model for concrete is proposed in which microcrack initiation, in the interfacial transition zone between aggregate particles and cement matrix, is governed by an exterior-point Eshelby solution. The model assumes a two-phase elastic composite, derived from an Eshelby solution and the Mori-Tanaka homogenization method, to which circular microcracks are added. A multi-component rough crack contact model is employed to simulate normal and shear behaviour of rough microcrack surfaces. It is shown, based on numerical predictions of uniaxial, biaxial and triaxial behaviour that the model captures key characteristics of concrete behaviour. An important aspect of the approach taken in this work is the adherence to a mechanistic modelling philosophy. In this regard the model is distinctly more rigorously mechanistic than its more phenomenological predecessors. Following this philosophy, a new more comprehensive crack-plane model is described which could be applied to crack-planes in the above model. In this model the crack surface is idealised as a series of conical teeth and corresponding recesses of variable height and slope. Based on this geometrical characterization, an effective contact function is derived to relate the contact stresses on the sides of the teeth to the net crack-plane stresses. Plastic embedment and frictional sliding are simulated using a local plasticity model in which the plastic surfaces are expressed in terms of the contact surface function. Numerical simulations of several direct shear tests indicate a good performance of the model. The incorporation of this crack-plane model in the overall constitutive model is the next step in the development of the latter. Computational aspects such as contact related numerical instability and accuracy of spherical integration rules employed in the constitutive model are also discussed. A smoothed contact state function is proposed to remove spurious contact chatter behaviour at a constitutive level. Finally, an initial assessment of the performance of the micromechanical model when implemented in a finite element program is presented. This evaluation clearly demonstrates the capability of the proposed model to simulate the behaviour of plain and reinforced concrete structural elements as well as demonstrating the potential of the micromechanical approach to achieve a robust and comprehensive model for concrete.

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Valori, Andrea. "Characterisation of cementitious materials by 1H NMR". Thesis, University of Surrey, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510562.

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Libri sul tema "Cementious materials"

Pöllmann, Herbert, a cura di. Cementitious Materials. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110473728.

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Malhotra, V. M. Pozzolanic and cementitious materials. Amsterdam, The Netherlands: Gordon and Breach, 1996.

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DeHayes, SM, e D. Stark, a cura di. Petrography of Cementitious Materials. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 1994. http://dx.doi.org/10.1520/stp1215-eb.

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1953-, DeHayes Sharon M., Stark D e Symposium on the Petrography of Cementitious Materials (1993 : Atlanta, Ga.), a cura di. Petrography of cementitious materials. Philadelphia, PA: ASTM, 1994.

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Conference on Advances in Cementitious Materials (1990 Gaithersburg, Md.). Advances in cementitious materials. Westerville, Ohio: American Ceramic Society, 1991.

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Soltesz, Steven M. Cementitious materials for thin patches. Salem, OR: Oregon Dept. of Transportation, Research Group, 2001.

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Pijaudier-Cabot, Gilles. Damage mechanics of cementitious materials. London: ISTE, 2012.

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1946-, Mai Y. W., a cura di. Fracture mechanics of cementitious materials. London: Blackie Academic & Professional, 1996.

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Rahman, Rehab O. Abdel, Ravil Z. Rakhimov, Nailia R. Rakhimova e Michael I. Ojovan. Cementitious Materials for Nuclear Waste Immobilization. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118511992.

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De Schutter, Geert, e Karel Lesage. Active Rheology Control of Cementitious Materials. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003289463.

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Capitoli di libri sul tema "Cementious materials"

Gdoutos, Emmanuel E. "Cementitious Materials". In Fracture Mechanics, 387–401. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-35098-7_14.

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De la Torre, Ángeles G., Isabel Santacruz, Laura León-Reina, Ana Cuesta e Miguel A. G. Aranda. "1. Diffraction and crystallography applied to anhydrous cements". In Cementitious Materials, a cura di Herbert Pöllmann, 3–30. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110473728-002.

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Aranda, Miguel A. G., Ana Cuesta, A. G. De la Torre, Isabel Santacruz e Laura León-Reina. "2. Diffraction and crystallography applied to hydrating cements". In Cementitious Materials, a cura di Herbert Pöllmann, 31–60. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110473728-003.

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Raab, Bastian, e Herbert Pöllmann. "3. Synthesis of highly reactive pure cement phases". In Cementitious Materials, a cura di Herbert Pöllmann, 61–102. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110473728-004.

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Lothenbach, Barbara, e Frank Winnefeld. "4. Thermodynamic modelling of cement hydration: Portland cements – blended cements – calcium sulfoaluminate cements". In Cementitious Materials, a cura di Herbert Pöllmann, 103–44. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110473728-005.

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Artioli, G., M. Secco, A. Addis e M. Bellotto. "5. Role of hydrotalcite-type layered double hydroxides in delayed pozzolanic reactions and their bearing on mortar dating". In Cementitious Materials, a cura di Herbert Pöllmann, 147–58. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110473728-006.

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Kaden, R., e H. Poellmann. "6. Setting control of CAC by substituted acetic acids and crystal structures of their calcium salts". In Cementitious Materials, a cura di Herbert Pöllmann, 159–90. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110473728-007.

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Stöber, S., e H. Pöllmann. "7. Crystallography and crystal chemistry of AFm phases related to cement chemistry". In Cementitious Materials, a cura di Herbert Pöllmann, 191–250. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110473728-008.

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Gao, X., B. Yuan, Q. L. Yu e H. J. H. Brouwers. "8. Chemistry, design and application of hybrid alkali activated binders". In Cementitious Materials, a cura di Herbert Pöllmann, 253–84. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110473728-009.

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Pritzel, Christian, Torsten Kowald, Yilmaz Sakalli e Reinhard Trettin. "9. Binding materials based on calcium sulphates". In Cementitious Materials, a cura di Herbert Pöllmann, 285–310. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110473728-010.

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Atti di convegni sul tema "Cementious materials"

Tamura, Masaki, e Yumi Ohiwa. "Use-Stage Environmental Performances of Cementious-Woodchip Compound Products Considering Resilience Measures in Disaster Situation". In Fourth International Conference on Sustainable Construction Materials and Technologies. Coventry University, 2016. http://dx.doi.org/10.18552/2016/scmt4s172.

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Hegyi, Andreea. "THE EFFECT OF TIO2 ON THE PROPERTIES OF CEMENTIOUS COMPOSITE MATERIALS �THE CURRENT STATE-OF-THE ART". In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/6.3/s26.051.

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Zhang, Emma Qingnan, Luping Tang e Thomas Zack. "Carbon Fiber as Anode Material for Cathodic Prevention in Cementitious Materials". In International Conference on the Durability of Concrete Structures. Purdue University Press, 2016. http://dx.doi.org/10.5703/1288284316149.

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García-González, J., P. Lemos, A. Pereira, J. Pozo, M. Guerra-Romero, A. Juan-Valdés e P. Faria. "Biodegradable Polymers on Cementitious Materials". In XV International Conference on Durability of Building Materials and Components. CIMNE, 2020. http://dx.doi.org/10.23967/dbmc.2020.017.

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"Supplementary Cementitious Materials for Sustainability". In SP-269: Concrete: The Sustainable Material Choice. American Concrete Institute, 2010. http://dx.doi.org/10.14359/51663719.

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"Influence of Supplementary Cementitious Materials on the Autogenous Self-Healing of Cracks in Cementitious Materials". In SP-320:10th ACI/RILEM International Conference on Cementitious Materials and Alternative Binders for Sustainable Concrete. American Concrete Institute, 2017. http://dx.doi.org/10.14359/51701050.

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Coulbeck, Teig S. V., Isaac P. G. Hammond, Christopher J. Gooding, James K. Wither, Iasmi Sterianou, Dimitra Soulioti e Evangelos Z. Kordatos. "Development of self-sensing cementitious materials". In Smart Structures and NDE for Industry 4.0, Smart Cities, and Energy Systems, a cura di Kerrie Gath e Norbert G. Meyendorf. SPIE, 2020. http://dx.doi.org/10.1117/12.2558875.

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"Alternative Cementitious Materials: Challenges And Opportunities". In SP-305: Durability and Sustainability of Concrete Structures. American Concrete Institute, 2015. http://dx.doi.org/10.14359/51688587.

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Němeček, J., J. Němečková e J. Němeček. "Micro-Scale Creep of Cementitious Materials". In Engineering Mechanics 2024. Institute of Solid Mechanics, Mechatronics and Biomechanics, Brno University of Technology, Brno, 2024. http://dx.doi.org/10.21495/em2024-214.

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Ram, Prashant, Kurt Smith, Ayesha Shah, Jan Olek e Myungook Kang. "Performance of Non-Cementitious Repair Materials for Concrete Pavement Partial-Depth Repairs in Wisconsin". In 12th International Conference on Concrete Pavements. International Society for Concrete Pavements, 2021. http://dx.doi.org/10.33593/plpdwoy3.

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Abstract (sommario):

The Wisconsin Department of Transportation (WisDOT) is continually looking for state-of the-art technologies, materials, and methodologies to cost-effectively preserve the condition of their pavements so as to extend the service life and delay the need for major rehabilitation or reconstruction. In a search for a more durable and sustainable concrete pavement repair strategy, WisDOT has used non-cementitious materials for partial-depth repairs (PDR) on concrete pavements but with varying levels of success. Where poor performance from these repairs has been observed, it has been attributed to either poor workmanship or inappropriate use of the repair material for the prevailing conditions. These factors suggest that the non-cementitious materials may have been used as a “band-aid” fix to allow for early opening to traffic rather than selected and implemented as the most suitable repair strategy to effectively address the specific distresses in the existing pavement. This paper presents a summary of an investigation into the use of non-cementitious repair materials for concrete pavement PDR applications. A field survey of five different non-cementitious repair materials used in PDR applications throughout Wisconsin was performed and the results documented. Additionally, the findings from a limited laboratory testing program conducted to assess the bond and dimensional stability properties of three non-cementitious materials at different testing temperatures are also presented. The paper concludes with guidance on the use of non-cementitious repair materials for concrete pavement PDR applications in Wisconsin.

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Rapporti di organizzazioni sul tema "Cementious materials"

Wijaya, Ignasius P. A., Eric Kreiger e Asuf Masud. An elastic-inelastic model and embedded bounce-back control for layered printing with cementitious materials. Engineer Research and Development Center (U.S.), gennaio 2024. http://dx.doi.org/10.21079/11681/48091.

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This paper presents a finite-deformation model for extrusion-based layered printing with cementitious materials. The evolution of mechanical properties as the printed material cures and stiffens results in nonphysical reduction in the magnitude of elastic strains when standard constitutive models are employed. This elastic recovery of the printing induced deformation contradicts the experimentally observed behavior of the printed cementitious materials that harden at a nearly-frozen deformed state. A thermodynamically motivated constraint on the evolution of elastic strains is imposed on the constitutive model to remedy the nonphysical bounce-back effect. An algorithm that is based on a strain-projection technique for the elastic part of deformation is developed that complements the inelastic response given by the Drucker–Prager model. It is then embedded in a finite strain finite element framework for the modeling and simulation of cure hardening and inelastic response of the early age cementitious materials. A ghost mesh method is proposed for continuous layer-wise printing of the material without the need for intermittent mesh generation technique or adaptive remeshing methods. The model is validated via comparison with experimental data and representative test cases are presented that investigate the mathematical and computational attributes of the proposed model.

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Groeneveld, Andrew, e C. Crane. Advanced cementitious materials for blast protection. Engineer Research and Development Center (U.S.), aprile 2023. http://dx.doi.org/10.21079/11681/46893.

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Advanced cementitious materials, commonly referred to as ultra-high performance concretes (UHPCs), are developing rapidly and show promise for civil infrastructure and protective construction applications. Structures exposed to blasts experience strain rates on the order of 102 s-1 or more. While a great deal of research has been published on the durability and the static properties of UHPC, there is less information on its dynamic properties. The purpose of this report is to (1) compile existing dynamic property data—including compressive strength, tensile strength, elastic modulus, and energy absorption—for six proprietary and research UHPCs and (2) implement a single-degree-of-freedom (SDOF) model for axisymmetric UHPC panels under blast loading as a means of comparing the UHPCs. Although simplified, the model allows identification of key material properties and promising materials for physical testing. Model results indicate that tensile strength has the greatest effect on panel deflection, with unit weight and elastic modulus having a moderate effect. CEMTECmultiscale® deflected least in the simulation. Lafarge Ductal®, a commonly available UHPC in North America, performed in the middle of the five UHPCs considered.

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Ucak-Astarlioglu, Mine, Jedadiah Burroughs, Charles Weiss, Kyle Klaus, Stephen Murrell, Samuel Craig, Jameson Shannon, Robert Moser, Kevin Wyss e James Tour. Graphene in cementitious materials. Engineer Research and Development Center (U.S.), dicembre 2023. http://dx.doi.org/10.21079/11681/48033.

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This project aims to determine the influence of laboratory-generated graphene (LGG) and commercial-grade graphene (CGG) on the chemical structure and compressive strength of graphene-cement mixtures. Determining the graphene-cement structure/processing/property relationships provides the most useful information for attaining the highest compressive strength. Graphene dose and particle size, speed of mixing, and dispersant agent were found to have important roles in graphene dispersion by affecting the adhesion forces between calcium silicate hydrate (CSH) gels and graphene surfaces that result in the enhanced strength of cement-graphene mixtures. X-ray diffraction (XRD), Raman, and scanning electron microscope (SEM) analyses were used to determine chemical microstructure, and compression testing for mechanical properties characterization, respectively. Based on observed results both LGG and CGG graphene cement mixtures showed an increase in the compressive strength over 7-, 14-, and 28-day age curing periods. Preliminary dispersion studies were performed to determine the most effective surfactant for graphene dispersion. Future studies will continue to research graphene—cement mortar and graphene—concrete composites using the most feasible graphene materials. These studies will prove invaluable for military programs, warfighter support, climate change, and civil works.

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Sugama, T., e T. ,. Lance Brothers, Bour, D. Butcher. Self-degradable Cementitious Sealing Materials. Office of Scientific and Technical Information (OSTI), ottobre 2010. http://dx.doi.org/10.2172/993804.

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Thornell, Travis, Charles Weiss, Sarah Williams, Jennifer Jefcoat, Zackery McClelland, Todd Rushing e Robert Moser. Magnetorheological composite materials (MRCMs) for instant and adaptable structural control. Engineer Research and Development Center (U.S.), novembre 2020. http://dx.doi.org/10.21079/11681/38721.

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Magnetic responsive materials can be used in a variety of applications. For structural applications, the ability to create tunable moduli from relatively soft materials with applied electromagnetic stimuli can be advantageous for light-weight protection. This study investigated magnetorheological composite materials involving carbonyl iron particles (CIP) embedded into two different systems. The first material system was a model cementitious system of CIP and kaolinite clay dispersed in mineral oil. The magnetorheological behaviors were investigated by using parallel plates with an attached magnetic accessory to evaluate deformations up to 1 T. The yield stress of these slurries was measured by using rotational and oscillatory experiments and was found to be controllable based on CIP loading and magnetic field strength with yield stresses ranging from 10 to 104 Pa. The second material system utilized a polystyrene-butadiene rubber solvent-cast films with CIP embedded. The flexible matrix can stiffen and become rigid when an external field is applied. For CIP loadings of 8% and 17% vol %, the storage modulus response for each loading stiffened by 22% and 74%, respectively.

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Olek, Jan, e Chaitanya Paleti. Compatibility of Cementitious Materials and Admixtures. Purdue University, dicembre 2012. http://dx.doi.org/10.5703/1288284315025.

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Roesler, Jeffery, Sachindra Dahal, Dan Zollinger e W. Jason Weiss. Summary Findings of Re-engineered Continuously Reinforced Concrete Pavement: Volume 1. Illinois Center for Transportation, maggio 2021. http://dx.doi.org/10.36501/0197-9191/21-011.

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This research project conducted laboratory testing on the design and impact of internal curing on concrete paving mixtures with supplementary cementitious materials and evaluated field test sections for the performance of crack properties and CRCP structure under environmental and FWD loading. Three experimental CRCP sections on Illinois Route 390 near Itasca, IL and two continuously reinforced concrete beams at UIUC ATREL test facilities were constructed and monitored. Erodibility testing was performed on foundation materials to determine the likelihood of certain combinations of materials as suitable base/subbase layers. A new post-tensioning system for CRCP was also evaluated for increased performance and cost-effectiveness. This report volume summarizes the three year research effort evaluating design, material, and construction features that have the potential for reducing the initial cost of CRCP without compromising its long-term performance.

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Flach, G. P. Degradation of Saltstone Disposal Unit Cementitious Materials. Office of Scientific and Technical Information (OSTI), agosto 2018. http://dx.doi.org/10.2172/1513682.

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Chandler, Mei, William Lawrimore, Micael Edwards, Robert Moser, Jameson Shannon e James O'Daniel. Mesoscale modeling of cementitious materials : phase I. Engineer Research and Development Center (U.S.), giugno 2019. http://dx.doi.org/10.21079/11681/32980.

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Lomboy, Gilson, Douglas Cleary, Seth Wagner, Yusef Mehta, Danielle Kennedy, Benjamin Watts, Peter Bly e Jared Oren. Long-term performance of sustainable pavements using ternary blended concrete with recycled aggregates. Engineer Research and Development Center (U.S.), maggio 2021. http://dx.doi.org/10.21079/11681/40780.

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Dwindling supplies of natural concrete aggregates, the cost of landfilling construction waste, and interest in sustainable design have increased the demand for recycled concrete aggregates (RCA) in new portland cement concrete mixtures. RCA repurposes waste material to provide useful ingredients for new construction applications. However, RCA can reduce the performance of the concrete. This study investigated the effectiveness of ternary blended binders, mixtures containing portland cement and two different supplementary cementitious materials, at mitigating performance losses of concrete mixtures with RCA materials. Concrete mixtures with different ternary binder combinations were batched with four recycled concrete aggregate materials. For the materials used, the study found that a blend of portland cement, Class C fly ash, and blast furnace slag produced the highest strength of ternary binder. At 50% replacement of virgin aggregates and ternary blended binder, some specimens showed comparable mechanical performance to a control mix of only portland cement as a binder and no RCA substitution. This study demonstrates that even at 50% RCA replacement, using the appropriate ternary binder can create a concrete mixture that performs similarly to a plain portland cement concrete without RCA, with the added benefit of being environmentally beneficial.

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