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Gotowa bibliografia na temat „Reactive powder concrete”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 20 lutego 2023

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Artykuły w czasopismach na temat "Reactive powder concrete"

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Kannangara, Thathsarani, Maurice Guerrieri, Sam Fragomeni i Paul Joseph. "A Study of the Residual Strength of Reactive Powder-Based Geopolymer Concrete under Elevated Temperatures". Applied Sciences 11, nr 24 (13.12.2021): 11834. http://dx.doi.org/10.3390/app112411834.

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This paper reports on studies relating to the unstressed residual compressive strengths of geopolymer pastes that are heated up to 800 °C, behavior of reactive powder concrete before and after exposure to elevated temperatures and thermal behavior of novel reactive powder geopolymer-based concretes. For this purpose, 10 geopolymer pastes and three reactive powder concrete mixtures were tested for residual strengths. Gladstone fly ash was used as the primary binder for both geopolymer pastes and reactive powder geopolymer concretes. In addition, four novel reactive powder geopolymer concrete mixes were prepared with zero cement utilization. While reactive powder concretes achieved the highest seven-day compressive strengths of approximately 140 MPa, very poor thermal behavior was observed, with explosive spalling occurring at a temperature of ca. 360 °C. The reactive powder geopolymer concretes, on the other hand, displayed relatively high thermal properties with no thermal cracking at 400 °C, or visible signs of spalling and very mild cracking in one case at 800 °C. In terms of the strength of reactive powder geopolymer concrete, a maximum compressive strength of approximately 76 MPa and residual strengths of approximately 61 MPa and 51 MPa at 400 °C and 800 °C, respectively, were observed.
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Sanjuán, Miguel Ángel, i Carmen Andrade. "Reactive Powder Concrete: Durability and Applications". Applied Sciences 11, nr 12 (18.06.2021): 5629. http://dx.doi.org/10.3390/app11125629.

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Reactive powder concrete (RPC) is an ultra-high-performance concrete (UHPC) developed years ago by Bouygues, with the aim to build strong, durable, and sustainable structures. Some differences can be underlined between the RPC and high-performance concrete (HPC); that is to say, RPC exhibits higher compressive and flexural strength, higher toughness, lower porosity, and lower permeability compared to HPC. Microstructural observations confirm that silica fume enhances the fiber–matrix interfacial characteristics, particularly in fiber pullout energy. This paper reviews the reported literature on RPC, and it offers a comparison between RPC and HPC. Therefore, some RPC potential applications may be inferred. For instance, some examples of footbridges and structural repair applications are given. Experimental measurements on air permeability, porosity, water absorption, carbonation rate, corrosion rate, and resistivity are evidence of the better performance of RPC over HPC. When these ultra-high-performance concretes are reinforced with discontinuous, short fibers, they exhibit better tensile strain-hardening performance.
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Kushartomo, Widodo, i Octavivia. "Durability of Reactive Powder Concrete". IOP Conference Series: Materials Science and Engineering 650 (30.10.2019): 012028. http://dx.doi.org/10.1088/1757-899x/650/1/012028.

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Śliwiński, J., i T. Zdeb. "Reactive Powder Concrete as a Polymer Modified Concrete". Restoration of Buildings and Monuments 18, nr 3-4 (1.08.2012): 161–68. http://dx.doi.org/10.1515/rbm-2012-6522.

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Haido, James H., Youkhanna Z. Dinkha i Badorul H. Abu-Bakar. "Slant shear strength of hybrid concrete made with old and new parts using reactive and inert waste powders". Academic Journal of Nawroz University 7, nr 4 (21.12.2018): 236. http://dx.doi.org/10.25007/ajnu.v7n4a296.

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Manufactured reactive powders, as a silica fume, are usually used in production of high strength concrete with for retrofitting purposes of concrete structures. The efficiency of inert waste glass powder in hybrid concrete fabrication has not been widely investigated, thus further studies are essentially considered in this area. In the present study, hybrid concrete prisms with size of 10x10x30 cm have been made with old ordinary concrete (OC) and new high strength concrete (HSC). High strength of new concrete part of these prisms is achieved via using of waste glass powder, silica fume and mixture of them. The roughness of interfacial surface between old and new parts of hybrid concrete is improved in various manners with utilizing sand blast, holes and grooves. Performance of these elements has been measured in terms of slant shear strength and mode of failure. The results have been shown that there is a relatively similar strength with using retrofitted concrete made with the used powder which includes silica fume, glass powders, and their mixture, the mixture of both powders, namely, silica fume and waste glass powders is regarded a best choice in the present stud. It is demonstrated also that the grooved interface between old and new concretes induces proper strength equivalent to 89% of control concrete prisms strength.
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Grzeszczyk, Stefania, i Aneta Matuszek-Chmurowska. "Investigation of Reactive Powder Concrete (RPC)". Bulletin of the Military University of Technology 67, nr 1 (3.04.2018): 127–40. http://dx.doi.org/10.5604/01.3001.0011.8052.

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Results of investigations of reactive powder concrete (RPC) are presented in the paper. Optimization of the concrete composition was performed to achieve the highest degree of grains packing based on the optimal graining curve according to Funk for dmax = 1000 μm and dmin = 0.1 μm. Cement, silica fume, quartz and sand powder were considered in the composition. Steel fibers addition of 25% by mass was applied. A very low water–to–binder ratio, amounting to 0.2, was reached applying novel generation of superplasticizers based on polycarboxylates. The RPC mixture remained fluid during 1 hour. The diameter of slump flow according to PN-EN standard amounted to 250 mm after 60 minutes. The hardened concrete RPC displayed high strength and durability. Compressive strength reached 145 MPa after 2 days and about 200 MPa after 28 days; the bending strength exceeded 50 MPa after 28 days. After 56 freezing/defrosting cycles in the deicing salt solution, the concrete has shown minimal salt scaling of only 0.0007 kg/m2. Therefore, frost resistance of the concrete studied can be rated as very good according to PN-EN standard. The SEM pictures proved the amorphous phase of hydrated calcium silicates (C-S-H) is the dominant phase within the RPC microstructure. Usually, the C-S-H phase tightly covers the quartz grains and is in close contact with the unreacted cement grains. Crystallites of the monosulphate (AFm) were also found. The concrete microstructure was compact; pores of a few micrometers were rarely observed. The RPC porosity was measured using the mercury porosimetry. Porosity reduction by almost twice (from 10.9% down to 4.4%) was found after the RPC curing from 2 to 28 days. In the same period, a fraction of small mezopores (diameter below 20 nm) increased from 39.8% to 77.1%. Based on the research results data, presented the RPC concrete can be regarded as an interesting alternative to other construction materials of enhanced explosion resistance. Key words: Reactive Powder Concrete, strength, durability, explosion resistance
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Long, Guangcheng, Ye Shi, Kunlin Ma i Youjun Xie. "Reactive powder concrete reinforced by nanoparticles". Advances in Cement Research 28, nr 2 (luty 2016): 99–109. http://dx.doi.org/10.1680/jadcr.15.00058.

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Washer, G., P. Fuchs, B. A. Graybeal i J. L. Hartmann. "Ultrasonic Testing of Reactive Powder Concrete". IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 51, nr 2 (luty 2004): 193–201. http://dx.doi.org/10.1109/tuffc.2004.1295394.

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Washer, G., P. Fuchs, B. A. Graybeal i J. L. Hartmann. "Ultrasonic testing of reactive powder concrete". IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 51, nr 2 (luty 2004): 193–201. http://dx.doi.org/10.1109/tuffc.2004.1320767.

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Ruan, Yanfeng, Baoguo Han, Xun Yu, Wei Zhang i Danna Wang. "Carbon nanotubes reinforced reactive powder concrete". Composites Part A: Applied Science and Manufacturing 112 (wrzesień 2018): 371–82. http://dx.doi.org/10.1016/j.compositesa.2018.06.025.

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Rozprawy doktorskie na temat "Reactive powder concrete"

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Menefy, Luke. "Investigation of Reactive Powder Concrete and it's Damping Characteristics when Utilised in Beam Elements". Thesis, Griffith University, 2008. http://hdl.handle.net/10072/365692.

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Reactive Powder Concrete (RPC) is a relatively new ultra high strength concrete with a wide range of capabilities. Currently it is used in high performance applications where either impact resistance, high durability and/or member size are governing factors in design. The relatively high cost, required production control, and lack of industry knowledge have generally precluded its widespread use in more common engineering applications. Accordingly, the major component of this Thesis aims to contribute new knowledge with respect to the understanding of the material behaviour and damping characteristics of RPC. To achieve this goal a staged experimental study was undertaken encompassing the following (1) the production and material behaviour including a parallel study on the durability of RPC in an aggressive environment (2) the static performance and damping characteristics of RPC when utilised in beam elements. The initial component of the investigation involved several trial mix programmes to ascertain the viability of RPC production using local Queensland materials. A further large scale production programme of RPC was carried out utilising two mixer types: (1) vertical pan mixer representing a precast mix and (2) a mobile inclined drum mixer representing an onsite mix. The results indicated that the onsite application of RPC was viable and resulted in only a minor reduction in characteristic strengths when compared to precast operations. A parallel experimental study investigating the relative performance of RPC immersed in acidic solutions indicated that the range of RPC’s investigated were more susceptible to sulphuric acid attack when compared to a standard high strength concrete (HSC) used in the investigation. Following verification of RPC characteristic strengths, twenty three test beams were produced as part of a large scale RPC production programme. These test beams were incrementally loaded to failure under simply supported conditions during which static measurements were observed both under load and upon the removal of load. The results indicated that the fibre reinforced (FR) RPC test beams exhibited a higher load capacity, an increase in first cracking loads, significantly reduced crack widths and an overall reduction in shear behaviour when compared to the non-fibre reinforced (NF) RPC and HSC test beams. Concurrent free vibration tests through the use of an impulse force hammer were carried out during the static loading of each of the twenty three test beams in an effort to ascertain the damping characteristics throughout the various levels of test beam damage. A new program using analytical and theoretical techniques was developed to analyse the excitation response histories (ERH) obtained at each load increment, the program was found to be more efficient when compared to previous analysis methods. A method of assessing the current and previous analysis methods was also incorporated within the program enabling the user to compare the damping ratio determined through the various analysis methods.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
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Helmi, Masdar. "Thermo-physical properties and high-temperature durability of reactive powder concrete (RPC)". Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33991/.

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The popular use of concrete, particularly in the construction industry, has continually challenged researchers to advance its performance to new levels. Research in this area has led to substantial ideas of reactive powder concrete (RPC) which is developed by controlling three main variables: composition, pressure during setting period, and post-set heat curing. A growing community of research has emerged to define the physical and mechanical properties of RPC, but to date few have focussed on the high temperature behaviour and aging effects after exposure to fireand that influence the durability of concrete. This research aimed to characterise the thermo-physical properties of RPC and to quantify the microstructural transformation caused by (i) high temperature curing, and (ii) fixed and cyclic high temperature exposure (at 28-day strength). The experimental work mainly used a RPC mixture and involved three defined stages. Firstly, the optimisation of RPC was investigated by analysing the mix composition and measuring the corresponding mechanical properties of RPC with variables such as heating rate, heating duration, and starting time of heating. Secondly, the transformation of microstructural properties was investigated with respect to the pre- and post-treatment conditions and included pore network evolution, elemental composition, and image analysis of the interfacial transition zone (ITZ). Thirdly, the response to high temperature exposure was analysed by focussing on the residual compressive strength and alteration of microstructural properties (after both static and cyclic temperature exposure of varying levels). The main findings are summarised as follows: (1) heat curing appears to have optimum impact (after casting) at a ramp rate of 50 °C/hr for 48 hours; (2) heat curing treatment induced some effects such as pore filling by tobermorite and xonotlite, with some dehydroxilation of C-S-H gel and Ca (OH)2; (3) the thermo-physical properties of RPC were all reduced following heat treatment/ exposure due to crack network progression; (4) after elevated temperature exposure, the compressive strength of RPC decreases due to differential shrinkage between the matrix and aggregate phases.
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Warnock, Robyn Ellen Civil &amp Environmental UNSW. "Short-term and time-dependent flexural behaviour of steel fibre-reinforced reactive powder concrete". Awarded by:University of New South Wales. Civil and Environmental, 2006. http://handle.unsw.edu.au/1959.4/23027.

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This thesis presents an experimental and theoretical study of the material and structural behaviour of a Steel-Fibre reinforced Reactive Powder Concrete (SF-RPC). The experimental program consisted of three phases. Phase 1 involved the development of a design mix for use throughout the remainder of the study. Phase 2 consisted of an in-depth investigation into the material properties of the mix. The final phase of the experimental component was the testing of 16 plain and prestressed SF-RPC beams. Twelve beams were tested under short-term loading to determine their cracking and ultimate moment capacity. The remaining 4 beams were used to investigate the time-dependent flexural behaviour of prestressed SF-RPC slabs. The material properties were measured using a range of short-term tests and included the compressive and flexural behaviour, static chord modulus of elasticity and crack mouth opening. In addition to the short-term tests, investigation into the time-dependent material behaviour was undertaken and included the creep and shrinkage characteristics of the material. The response of the material to various curing conditions was also investigated. The structural behaviour investigated included the short-term flexural moment-curvature response and load-deflection behaviour of beams and slabs along with the crack patterns of both plain and prestressed SF-RPC members. In addition to the investigations into the short-term flexural behaviour, a study into the time-dependent flexural behaviour was also undertaken. There are currently 2 available models for predicting the flexural response of plain and prestressed RPC cross-sections. The analytical phase of this investigation involved an evaluation of these models. Based on the experimental findings and analysis, a modified model was proposed for calculating the short-term flexural behaviour of plain and prestressed SF-RPC beams. The applicability of an age-adjusted effective modulus method for calculating the time-dependent deformations of prestressed SF-RPC slabs under various levels of sustained loads was also evaluated and found to be adequate with minor refinements.
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Gao, Xiang, i S3090502@student rmit edu au. "Mix Design and Impact Response of Fibre Reinforced and Plain Reactive Powder Concrete". RMIT University. Civil, Environmental and Chemical Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080424.150722.

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Concrete is the most broadly used material in construction worldwide and Reactive Powder Concrete (RPC, a type of ultra high performance concrete) is a relatively new member of the concrete family. In this work the critical parameters of RPC mix design are investigated and the mix design is explored through a program of concrete casting and testing. Owing to the enhanced microstructure of RPC, porosity and permeability can be significantly decreased in the concrete matrix. This benefits the durability characteristics of RPC elements resulting in a longer service life with less maintenance costs than conventional concrete. It has been used for high integrity radiation waste material containers because of its low permeability and durability. Fibre reinforced RPC is also ideal for use in long span and thin shell structural elements without traditional reinforcement because of its advantageous flexural strength. Moreover, due to improved impact resistance, RPC can be widely employed in piers of bridges, military construction and blast protection. There is no standard approach to assessing the impact resistance of concrete. This investigation utilises relatively well accepted impact equipment to evaluate the mechanical properties of RPC under dynamic loading. The compressive and flexural tensile strengths of plain and fibre reinforced RPC are investigated using a variety of specimens and apparatus. The dynamic increase factor (DIF) is evaluated to indicate the strain rate sensitivity of the compressive and flexural strength.
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Vanderlei, Romel Dias. "Análise experimental do concreto de pós reativos: dosagem e propriedades mecânicas". Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-23082006-095043/.

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A tecnologia dos materiais a base de cimento Portland vem se desenvolvendo rapidamente, onde a melhoria das propriedades mecânicas vem sendo alcançada, eliminando os agregados graúdos e estudando a composição granulométrica da mistura, procurando preencher os vazios utilizando materiais finos e ultrafinos, como pó de quartzo e a sílica ativa. Esta pesquisa tem como objetivos: desenvolver concreto de pós reativos com resistência à compressão próxima de 200 MPa e módulo de elasticidade acima de 45 GPa; propor uma relação constitutiva para o material, considerando o volume de fibras; especificar as deformações máximas na tração e na compressão; e verificar a influência das fibras nas resistências à compressão e à tração na flexão. Para isso, foi utilizado o método de empacotamento das partículas sólidas, com o intuito de definir composições granulométricas, e desenvolveu-se técnicas necessárias para a moldagem, adensamento e cura térmica. A análise experimental compreendeu o estudo das seguintes propriedades: resistência à compressão, módulo de elasticidade, resistência à tração na flexão, deformações e ductilidade. As fibras metálicas melhoraram as propriedades mecânicas e aumentaram a ductilidade do concreto. A temperatura de cura e o tempo de submissão ao tratamento térmico, tornou o material mais resistente. A deformação específica máxima na compressão foi definida experimentalmente como 4,3%. O limite elástico para as deformações de tração ficou em 0,28%. Foi proposta uma relação constitutiva para tensões de compressão, que pode ser utilizada para concretos de pós reativos, com resistência à compressão próxima de 200 MPa e taxa de fibras até 4% em volume. Os resultados obtidos indicam que o concreto de pós reativos desenvolvido apresentou altas resistências à compressão e à tração na flexão, onde a microestrutura do material mostrou-se com baixíssima porosidade e interface pasta - agregado praticamente suprimida. A tecnologia desenvolvida nesta pesquisa pode ser considerada um grande avanço na tecnologia de materiais a base de cimento Portland que, com maiores aperfeiçoamentos, espera-se a aplicação desse material em situações que tirem proveito das excelentes propriedades mecânicas e durabilidade
The technology of Portland cement materials has developed quickly, where the improvement of the mechanical properties has been reached, eliminating the coarse aggregates and studying the granular mixture, in order to fill the emptiness with fine and ultra-fine materials, like crushed quartz and silica fume. The present paper aimed: develop reactive powder concrete with compressive strength close to 200 MPa and module of elasticity above 45 GPa; propose a strength x strain relationship in compression for the material considering the volume of fibers; specify the maximum strain in the traction and in the compression; and to verify the influence of the fibers in the compression strength and in the bending strength. It went using the method of packing of the solid particles to define the grain size distribution, and necessary techniques were developed for the preparation and thermal cure. The experimental analysis understood the study of the following properties: compression strength, module of elasticity, bending strength, strain and ductility. The metallic fibers improved the mechanical properties and they increased the ductility of the concrete. The cure temperature and the time of submission to the thermal treatment, improved the compression strength. The maximum strain in the compression was defined experimentally as 4,3%. The elastic limit for the traction strain was 0,28%. A strength x strain relationship in compression was proposed, and can be used in reactive powders concrete, with compression strength of around 200 MPa and rate of fibers of up to 4% of volume. The results indicate that the reactive powders concrete developed presented excellent compression strength and bending strength, and the material presented a microestrutura with low porosity. The technology developed in this research can be considered a great progress in the technology of materials with Portland cement, and the application of that material is expected in situations that use advantage of the excellent mechanical properties and durability
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Christ, Roberto. "Desenvolvimento de compósitos cimentícios avançados à base de pós-reativos com misturas híbridas de fibras e reduzido impacto ambiental". Universidade do Vale do Rio dos Sinos, 2014. http://www.repositorio.jesuita.org.br/handle/UNISINOS/3207.

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itt Performance - Instituto Tecnológico em Desempenho da Construção Civil
O desenvolvimento de novos concretos vem sendo ampliado ao longo dos anos, o que ocorre paralelamente ao aprimoramento dos cálculos estruturais e ao maior conhecimento sobre as propriedades dos materiais, o que conduz os projetistas ao desenvolvimento de estruturas que necessitam ter características específicas. Com isso surge a necessidade de se desenvolver concretos especiais, que apresentam elevada resistência mecânica e durabilidade. O concreto de pós reativos, também chamado de CPR, é um exemplo destes materiais. Trata-se de um concreto de ultra alto desempenho, com elevada resistência mecânica, extremamente dúctil e de baixa porosidade. Este tipo de concreto apresenta propriedades mecânicas superiores em comparação aos concretos de alta resistência, chegando a resistências à compressão de 200 MPa, à tração de 45MPa e módulo de elasticidade superior a 50 GPa. O consumo de cimento neste tipo de concreto pode atingir 800 kg/m3, além de incorporar elevado volume de sílica ativa. A otimização granular dos constituintes, realizada através de métodos de empacotamento de partículas, faz com que seja possível obter um material com o mínimo de vazios e elevada densidade. As fibras introduzidas no composto proporcionam elevada ductilidade. Neste trabalho, parte do cimento Portland foi substituído por cinza volante, para desenvolver um CPR com baixo consumo de aglomerantes. Também foi estudada a incorporação de dois tipos de fibras, ou hibridização, para uma matriz de CPR com menor consumo de cimento. A introdução de dois tipos distintos de fibras proporciona ao material maior sinergia, diminuindo a formação e a propagação de fissuras durante o carregamento. Os resultados obtidos nesta pesquisa mostram que a substituição parcial do cimento por cinza volante apresentou melhor desempenho mecânico, atingindo resistência à compressão de aproximadamente 190 MPa com 30% de adição. A incorporação de dois tipos distintos de fibras, aço e polipropileno em teores de 80% e 20% respectivamente, proporcionou ao material elevada resistência à tração na flexão e tenacidade. Portanto, é possível dosar CPR com menores consumos de cimento e uso de dois tipos de fibras, melhorando as propriedades da mistura e obtendo um compósito com reduzido impacto ambiental.
The development of new concretes is being expanded over the years, withal the improvements in structural design, along the increased knowledge of materials properties, which leads the designers to develop structures with specific requirements. It arises the need of the development of special concretes, with have enhanced mechanical strength and durability. Reactive powder concrete, also called RPC, is an example of these materials. This is an ultra-high-performance concrete with high mechanical strength, extremely ductile and low porosity. This type of concrete has superior mechanical properties compared to high strength concrete, reaching compressive strengths of 200 MPa, tensile strengths of 45 MPa and modulus higher than 50 GPa. The cement consumption in this type of concrete may reach 800 kg/m3, while incorporating high volumes of silica fume. The optimization of granular constituents accomplished by particle packing methods provides a material with a minimum of voids and also high density. The fiber introduced into the material compound provides high ductility. On this report, fly ash was used to replace some part of the cement, aiming the development of a RPC with low agglomerate consumption. It was also studied the use of two types of fiber, or hybridization, to a RPC matrix array of CPR with less consumption of cement. The introduction of two distinct types of fibers gives the material improved synergy, decreasing the formation and propagation of cracks during the charging. The results obtained in this study show that the partial replacement of cement by fly ash gives better mechanical performance, reaching the compressive strength of approximately 190 MPa with 30% addition. The incorporation of two different types of fibers, steel and polypropylene at levels of 80% and 20% respectively, provided the materials high tensile strength and toughness. Therefore, it is possible to compose an RPC with lower cement consumption and use of two types of fibers, improving the properties of the mixture and obtaining a composite with reduced environmental impact.
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Cherkaoui, Khalid. "Caractérisation de la microstructure et comportement à court et long terme d'un Béton de Poudre Réactive extrudable". Thesis, Evry-Val d'Essonne, 2010. http://www.theses.fr/2010EVRY0046/document.

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Les Bétons de Poudre Réactive (BPR) sont connus pour leur résistance très élevée et leur bonne durabilité, mais aussi pour leur prix élevé. L’objectif de cette étude concerne la mise au point d’une formulation de BPR extrudable (BPR). Des essais préliminaires d’écoulement au mini cône d’Abrams ont été réalisés avec des teneurs variées en superplastifiant et en substituant partiellement la fumée de silice par du quartz broyé. Cinq mélanges ont été retenus et caractérisés de façon systématique au microscope électronique à balayage et en diffraction des Rayons X. Une étude complète de retrait au jeune âge, de résistance mécanique et de durabilité face à l’azote et aux ions chlorure a été menée. Un montage expérimental d’extrusion a été mis au point. Un mélange incorporant du quartz broyé en remplacement d’une fraction de la fumée de silice et une composition optimisée en superplastifiant montre des propriétés intéressantes : extrudabilité, très bonne durabilité, performances mécaniques améliorées et retrait diminué. Sur cette composition, l’étude microstructurale met en évidence le rôle que joue le superplastifiant sur la chimie d’hydratation avec une forte consommation en bélite. Ce mélange permet ainsi de diminuer le coût de fabrication pour un BPR en permettant d’économiser la fumée de silice coûteuse et en ne nécessitant aucun traitement thermique
Reactive Powder Concrete (RPC) is well known for ultra-high mechanical performances and very good durability as well as for a high cost. The aim of this study is to find an extrudable RPC. Abrams cone preliminary tests were made with various contents of superplasticizer and a partial substitution of silica fume by crushed quartz. Then, fives concrete samples were chosen and systematically characterized by scanning electron microscopy and X-ray diffraction. Then, a complete study was made including early-age shrinkage, mechanical strength, gas permeability and chloride diffusion measurements. An experimental extruder was build. Among the five compositions, one of them, where crushed quartz replaces a part of silica fume, exhibits very good properties: good extrudability, very good durability, and better mechanical strength with an improvement of shrinkage. The microstructural study of this composition highlights the effect of the superplasticizer on hydration, with high belite consumption. This composition allows a lower cost of RPC with a decreasing of silica fume content, without thermal treatment
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Prazeres, Xavier Emídio Glórias. "Betão de elevada resistência para elementos muito esbeltos". Master's thesis, Universidade de Évora, 2011. http://hdl.handle.net/10174/11585.

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Esta dissertação pretendeu demonstrar a actual importância do desenvolvimento de betões de alta resistência na execução das mais variadas construções que vão surgindo com o avanço conjunto da tecnologia ao longo do tempo, atendendo não só a parâmetros relacionados com a resistência destes betões mas também a um dos factores que se tem vindo a tornar muito relevante na actualidade, o ambiente. Este trabalho envolve um caso de estudo que compreendeu numa primeira fase, a concepção de um betão de elevada resistência tendo por base a utilização dos princípios da pesquisa mencionados anteriormente. Seguidamente foram determinadas a propriedades mecânicas desse betão, sendo elas a resistência à compressão, módulo de elasticidade e fluência, em ensaios realizados ao longo de quatro meses. Conjuntamente com estes ensaios foram fabricadas, vigas de perfil em “I” de 1,10m de comprimento, 10cm de largura, 10cm de altura, 2 cm de espessura de alma e com 2cm ou 2,4cm de espessura de banzo submetidas à rotura semanalmente e mensalmente de forma a obter a solução mais eficaz entre armadura e betão. Concluiu-se que: É possível a concepção de um betão de elevada resistência utilizando os constituintes correntes na indústria da construção. O betão desenvolvido adequa-se à execução do tipo de vigas mencionadas ao longo do trabalho, apresentando estas, um grande potencial de desenvolvimento dado que têm elevadas resistências com pesos moderados. A metodologia de cálculo para o dimensionamento deste tipo de vigas é idêntica à utilizada no dimensionamento de peças normais; ### Abstract: High Strength Concrete for Very Slender Elements The main goal is to demonstrate the current importance of developing high-strength concrete. With the technology’s development, high-strength concrete has become very important in several constructions not only by the characteristics related to the concrete´s strength, but also in one of the factors that proved to be very relevant nowadays, the environment. Initially, it was made a case study in designing a high-strength concrete based on the use of research principles outlined above. In trials conducted over four months, we determine the mechanical properties of concrete which are compressive strength, modulus of elasticity and fluency. In order to obtain the most effective solution between armor and concrete, were fabricated beams in a "I" of 1.10 m long, 10 cm wide, 10 cm high, 2 cm web thickness with 2cm or 2.4 cm flange thickness weekly and monthly subjected to disruption. With the goal in mind it is possible to design a high-strength concrete using the current constituents in the construction industry. The concrete is suitable for implementing this type of beams mentioned throughout the work, have enormous potential because they have high resistance with only moderate weights. The calculation methodology for the design of such beams is identical to the design of normal pieces.
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Panenková, Monika. "Reaktivní práškové kompozity a cementové kompozity bez makropórů". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372126.

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This diploma thesis deals with the design principles and manifacture of ultra performance concrete (UHPC), reactive powder composites (RPC) and other fine-grained materials, such as Macro defect free (MDF) or Densified systems with small particles (DSP). Theoretical part of this work is focused on the requirements of properties and composition UHPC and RPC and methodology of their design principles. Experimental part describes design principles RPC, manufacture of test specimens, testing of certain physical and mechanical properties, such as tensile strenght, bending strenght and compressive strenght and determination chemical character X-ray and thermal analysis.
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Sauzéat, Emmanuel. "Composition et microstructure des bétons de poudres réactives : effets des traitements thermiques et du traitement compressif". Vandoeuvre-les-Nancy, INPL, 1998. http://www.theses.fr/1998INPL113N.

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Les bétons de poudres réactives (BPR) sont des bétons à ultra-hautes performances, caractérisés par le choix rigoureux de leur composants initiaux et par des traitements post-prises. Les propriétés exceptionnelles étant dues à la qualité de leur phase liante, l'objectif de cette étude est de décrire l'évolution de cette phase, et en particulier des C-S-H, en fonction de plusieurs traitements post-prises à 20°C, 90°C, 200°C et 250°C. Dans ce but, on utilise plusieurs techniques analytiques qui permettent d'aborder la composition et l'ordre local des phases présentes, leur cristallochimie, leur minéralogie, leur agencement, l'état de la porosité à plusieurs échelle d'analyse, l'état de l'eau et les propriétés d'hydratation des C-S-H. Les résultats sont recoupés et interprétés dans le cadre d'un modèle descriptif de la phase C-S-H qui s'appuie sur ses propriétés gonflantes. Dans un premier temps on établit la spécificité des BPR par rapport aux BO et BHP en montrant en particulier qu'ils sont organisés à moyenne distance. On montre ensuite que les traitements thermiques à 90°C sont caractérisés par une organisation particulière du volume poreux et une très faible connectivité qui engendre des conditions hydrothermales légères. Dans ces conditions, on observe un épaississement statistique des feuillets des C-S-H en même temps qu'une augmentation légère de leur cristallinité. Lorsque la température de traitement augmente et atteint 200°C ou 250°C, les C-S-H subissent de façon transitoire des conditions hydrothermales poussées qui entrainent une forte augmentation de leur cristallinité, un épaississement statistique de leur feuillet et la synthèse de xonotlite dans les bulles d'air. Dans un second temps, l'eau est expulsée des BPR qui se déshydratent et se fracturent fortement, entrainant une augmentation importante de leur porosité accessible et de la taille moyenne des pores.
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Części książek na temat "Reactive powder concrete"

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Makul, Natt. "Principles of Reactive Powder Concrete". W Structural Integrity, 99–114. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69602-3_5.

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Wang, Yue, Ming-zhe An, Zi-ruo Yu i Xin-tuo Hou. "Durability of Green Reactive Powder Concrete". W LTLGB 2012, 863–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-34651-4_116.

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Gao, Ri, Zhi Min Liu, Li Qian Zhang i Piet Stroeven. "Static Properties of Plain Reactive Powder Concrete Beams". W Environmental Ecology and Technology of Concrete, 521–27. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-983-0.521.

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Machado, F. G. D., L. G. Pedroti, J. V. B. Lemes, G. E. S. Lima, L. A. F. Fioresi, W. E. H. Fernandes, R. C. S. S. Alvarenga i J. Alexandre. "Addition of Cellulose Nanofibers in Reactive Powder Concrete". W Characterization of Minerals, Metals, and Materials 2017, 529–35. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51382-9_57.

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Dhundasi, Abbas Ali, R. B. Khadiranaikar i Kashinath Motagi. "Durability Properties of Fibre-Reinforced Reactive Powder Concrete". W Recent Trends in Construction Technology and Management, 15–28. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2145-2_2.

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Xing, Feng, Liang Peng Deng, Zheng Liang Cao i Li Dong Huang. "Static Loading Investigation on Well Cover of Reactive Powder Concrete". W Environmental Ecology and Technology of Concrete, 556–60. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-983-0.556.

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Korb, J. P., D. Petit, S. Philippot, H. Zanni, V. Maret i M. Cheyrezy. "Nuclear Relaxation of Water Confined in Reactive Powder Concrete". W Nuclear Magnetic Resonance Spectroscopy of Cement-Based Materials, 333–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-80432-8_26.

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Xing, Feng, Li Dong Huang, Zheng Liang Cao i Liang Peng Deng. "Study on Preparation Technique for Low-Cost Green Reactive Powder Concrete". W Environmental Ecology and Technology of Concrete, 405–10. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-983-0.405.

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Nadiger, Akshay, C. Harinath Reddy, Shankar Vasudevan i K. M. Mini. "Fuzzy Logic Modeling for Strength Prediction of Reactive Powder Concrete". W Advances in Intelligent Systems and Computing, 375–86. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5520-1_35.

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Lemes, J. V. B., G. E. S. Lima, F. G. D. Machado, L. G. Pedroti, L. A. F. Fioresi, W. E. H. Fernandes, R. C. S. S. Alvarenga i S. Monteiro. "Reactive Powder Concrete Production with the Addition of Granite Processing Waste". W Characterization of Minerals, Metals, and Materials 2017, 729–35. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51382-9_80.

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Streszczenia konferencji na temat "Reactive powder concrete"

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Washer, Glenn. "Nondestructive Evaluation of Reactive Powder Concrete". W QUANTITATIVE NONDESTRUCTIVE EVALUATION. AIP, 2004. http://dx.doi.org/10.1063/1.1711732.

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Cizmar, D., D. Mestrovic i J. Radic. "Arch bridge made of reactive powder concrete". W HIGH PERFORMANCE STRUCTURES AND MATERIALS 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/hpsm06042.

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"Mechanical Properties of Modified Reactive Powder Concrete". W SP-173: Fifth CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete. American Concrete Institute, 1997. http://dx.doi.org/10.14359/6175.

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"Modified Reactive Powder Concrete with Artificial Aggregates". W SP-195: The Sixth Canmet/ACI Conference on Superplasticizers and Other Chemical Admixtures in Concrete. American Concrete Institute, 2000. http://dx.doi.org/10.14359/9928.

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Yan, Guangjie. "Application of Reactive Powder Concrete in Highway Barriers". W Second International Conference on Transportation Engineering. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41039(345)204.

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Mestrovic, D., D. Cizmar i V. Stanilovic. "Reactive powder concrete: material for the 21st century". W MATERIALS CHARACTERISATION 2007. Southampton, UK: WIT Press, 2007. http://dx.doi.org/10.2495/mc070131.

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Yao, Shaowei, i Man Zhao. "High Temperature Properties Research of Reactive Powder Concrete". W 2016 International Conference on Civil, Transportation and Environment. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/iccte-16.2016.157.

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"Biaxial Tensile Behavior of the Reactive Powder Concrete". W "SP-209: ACI Fifth Int Conf Innovations in Design with Emphasis on Seismic, Wind and Environmental Loading, Quality Con". American Concrete Institute, 2002. http://dx.doi.org/10.14359/12510.

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Alfeehan, Ashraf A., i Nibras M. Sheer. "Reactive powder concrete sandwich panels with mechanical connection approach". W 2018 International Conference on Advance of Sustainable Engineering and its Application (ICASEA). IEEE, 2018. http://dx.doi.org/10.1109/icasea.2018.8370968.

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Sun, Mingde, Ri Gao, Aili Li i Yongjing Wang. "BOND OF REINFORCEMENT IN REACTIVE POWDER CONCRETE: EXPERIMENTAL STUDY". W VII European Congress on Computational Methods in Applied Sciences and Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2016. http://dx.doi.org/10.7712/100016.2373.5785.

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Raporty organizacyjne na temat "Reactive powder concrete"

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Campbell, Roy L., Edward F. O'Neil, William M. Dowd i Christophe E. Dauriac. Reactive Powder Concrete for Producing Sewer, Culvert, and Pressure Pipes. Fort Belvoir, VA: Defense Technical Information Center, sierpień 1998. http://dx.doi.org/10.21236/ada354199.

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Snyder, K. A., i H. S. Lew. Alkali-silica reaction degradation of nuclear power plant concrete structures :. Gaithersburg, MD: National Institute of Standards and Technology, 2013. http://dx.doi.org/10.6028/nist.ir.7937.

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Sadek, Fahim, Travis Thonstad, Sorin Marcu, Jonathan M. Weigand, Timothy J. Barrett, Hai S. Lew, Long T. Phan i Adam L. Pintar. Structural Performance of Nuclear Power Plant Concrete Structures Affected by Alkali-Silica Reaction (ASR) Task 1: Assessing In-Situ Mechanical Properties of ASR-Affected Concrete. National Institute of Standards and Technology, luty 2021. http://dx.doi.org/10.6028/nist.tn.2121.

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Snyder, Kenneth A. Material Research Support for the Structural Performance of Nuclear Power Plant Concrete Structures Affected by Alkali-Silica Reaction. Gaithersburg, MD: National Institute of Standards and Technology, 2022. http://dx.doi.org/10.6028/nist.ir.8415.

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Thonstad, Travis, Jonathan M. Weigand, Fahim Sadek, Sorin Marcu, Timothy J. Barrett, Hai S. Lew, Long T. Phan i Adam L. Pintar. Structural Performance of Nuclear Power Plant Concrete Structures Affected by Alkali-Silica Reaction (ASR) Task 2: Assessing Bond and Anchorage of Reinforcing Bars in ASR-Affected Concrete. National Institute of Standards and Technology, luty 2021. http://dx.doi.org/10.6028/nist.tn.2127.

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Reactive Powder Concrete. Purdue University, 2007. http://dx.doi.org/10.5703/1288284315748.

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