691 : Matériaux de construction. Pièces et parties composantes

691.1 Matériaux de construction d'origine organique (bois, papier, plastique, etc)
691.3
691.32 Béton. Eléments de construction en béton
691.328 Béton armé. Béton précontraint. Eléments en béton armé

Ouvrages de la bibliothèque en indexation 691

About microcracking due to leaching in cementitious composites / Thomas Rougelot in Cement and concrete research, Vol. 40 N° 2 (02 ex.) (Fevrier 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 271-283 Titre : About microcracking due to leaching in cementitious composites : x-ray microtomography description and numerical approach Type de document : texte imprimé Auteurs : Thomas Rougelot, Auteur ; Nicolas Burlion, Auteur ; Dominique Bernard, Auteur Année de publication : 2010 Article en page(s) : pp. 271-283 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cementitious  composites  Endogenous  and  decalcification  shrinkages  Leaching  Microcracking  X-ray  computed  microtomography Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Chemical shock of cement based materials leads to significant degradation of their physical properties. A typical scenario is a calcium leaching due to water (water with very low pH compared with that of pore fluid). The main objective of this paper is to evaluate the evolution of microstructure induced by leaching of a cementitious composite using synchrotron X-ray micro tomography, mainly from an experimental point of view. In this particular case, it was possible to identify cracking induced by leaching. After a description of the degradation mechanism and the X-ray synchrotron microtomographic analysis, numerical simulations are performed in order to show that cracking is induced by an initial pre-stressing of the composite, coupled with decalcification shrinkage and dramatic decrease in tensile strength during leaching. X-ray microtomography analysis allowed to make evidence of an induced microcracking in cementitious material submitted to leaching. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XHT4G5-2&_user=6 [...] [article] About microcracking due to leaching in cementitious composites : x-ray microtomography description and numerical approach [texte imprimé] / Thomas Rougelot, Auteur ; Nicolas Burlion, Auteur ; Dominique Bernard, Auteur . - 2010 . - pp. 271-283. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 271-283 Mots-clés : Cementitious  composites  Endogenous  and  decalcification  shrinkages  Leaching  Microcracking  X-ray  computed  microtomography Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Chemical shock of cement based materials leads to significant degradation of their physical properties. A typical scenario is a calcium leaching due to water (water with very low pH compared with that of pore fluid). The main objective of this paper is to evaluate the evolution of microstructure induced by leaching of a cementitious composite using synchrotron X-ray micro tomography, mainly from an experimental point of view. In this particular case, it was possible to identify cracking induced by leaching. After a description of the degradation mechanism and the X-ray synchrotron microtomographic analysis, numerical simulations are performed in order to show that cracking is induced by an initial pre-stressing of the composite, coupled with decalcification shrinkage and dramatic decrease in tensile strength during leaching. X-ray microtomography analysis allowed to make evidence of an induced microcracking in cementitious material submitted to leaching. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XHT4G5-2&_user=6 [...]

An investigation into the strength development of Wastepaper Sludge Ash blended with Ground Granulated Blastfurnace Slag / E. Mozaffari in Cement and concrete research, Vol. 39 N° 10 (Octobre 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 10 (Octobre 2009) . - pp. Titre : An investigation into the strength development of Wastepaper Sludge Ash blended with Ground Granulated Blastfurnace Slag Type de document : texte imprimé Auteurs : E. Mozaffari, Auteur ; J.M. Kinuthia, Auteur ; J. Bai Wild, Auteur Année de publication : 2009 Article en page(s) : pp. Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Wastepaper  Sludge  Ash;  lag;  Lime;  Setting;  Strength Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Wastepaper Sludge Ash (WSA) contains reactive components such as free lime (CaO), and less reactive and inert mineral species. When water is added to WSA some constituents hydrate faster than others, lime being the fastest giving high alkalinity to the solution. If the WSA is combined with Ground Granulated Blastfurnace Slag (GGBS) then the latter, activated by the raised pH, produces new minerals which will contribute further to the strength development of the paste. The kinetics of the hydration reactions and the possible ways of making lime a more effective contributor in activating other phases in the WSA–GGBS system are discussed. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001525 [article] An investigation into the strength development of Wastepaper Sludge Ash blended with Ground Granulated Blastfurnace Slag [texte imprimé] / E. Mozaffari, Auteur ; J.M. Kinuthia, Auteur ; J. Bai Wild, Auteur . - 2009 . - pp. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 10 (Octobre 2009) . - pp. Mots-clés : Wastepaper  Sludge  Ash;  lag;  Lime;  Setting;  Strength Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Wastepaper Sludge Ash (WSA) contains reactive components such as free lime (CaO), and less reactive and inert mineral species. When water is added to WSA some constituents hydrate faster than others, lime being the fastest giving high alkalinity to the solution. If the WSA is combined with Ground Granulated Blastfurnace Slag (GGBS) then the latter, activated by the raised pH, produces new minerals which will contribute further to the strength development of the paste. The kinetics of the hydration reactions and the possible ways of making lime a more effective contributor in activating other phases in the WSA–GGBS system are discussed. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001525

An investigation of microstructure evolution in cement paste through setting using ultrasonic and rheological measurements / Kolluru V. Subramaniam in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 33-44 Titre : An investigation of microstructure evolution in cement paste through setting using ultrasonic and rheological measurements Type de document : texte imprimé Auteurs : Kolluru V. Subramaniam, Auteur ; Xiaojun Wang, Auteur Article en page(s) : pp. 33-44 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Microstructure  Porosity  Rheology  Ultrasonic  Testing  Setting Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The response of hydrating cement paste through setting are monitored using rheological measurements and ultrasonic reflection measurements. Increases in the elastic modulus and yield stress of cement paste with time are obtained from the rheological measurements. Ultrasonic measurements are performed using horizontally polarized shear waves (SH) reflected off of the hydrating cement paste. Changes in the ultrasonic signal through setting are related with changes in the porosity and stiffness of an equivalent water-filled poroelastic material, which provides identical acoustic impedance. The measured changes in the shear modulus obtained from ultrasonic measurement are shown to correlate well with increase in elastic modulus obtained from rheological measurements. The increase in the shear modulus of the porous material obtained from the ultrasonic measurements is shown to correspond well with the observed increase in the yield stress of the cement paste. By combining the information from rheological and ultrasonic measurements, it is found that even in the fluid stage there is sufficient structural integrity in the arrangement of cement grains to support low-amplitude shear stress and the evolution of a continuously connected network of cement particles within the paste is coincident with a rapid increase in the shear modulus of the porous skeleton. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XHJX8K-1&_user=6 [...] [article] An investigation of microstructure evolution in cement paste through setting using ultrasonic and rheological measurements [texte imprimé] / Kolluru V. Subramaniam, Auteur ; Xiaojun Wang, Auteur . - pp. 33-44. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 33-44 Mots-clés : Microstructure  Porosity  Rheology  Ultrasonic  Testing  Setting Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The response of hydrating cement paste through setting are monitored using rheological measurements and ultrasonic reflection measurements. Increases in the elastic modulus and yield stress of cement paste with time are obtained from the rheological measurements. Ultrasonic measurements are performed using horizontally polarized shear waves (SH) reflected off of the hydrating cement paste. Changes in the ultrasonic signal through setting are related with changes in the porosity and stiffness of an equivalent water-filled poroelastic material, which provides identical acoustic impedance. The measured changes in the shear modulus obtained from ultrasonic measurement are shown to correlate well with increase in elastic modulus obtained from rheological measurements. The increase in the shear modulus of the porous material obtained from the ultrasonic measurements is shown to correspond well with the observed increase in the yield stress of the cement paste. By combining the information from rheological and ultrasonic measurements, it is found that even in the fluid stage there is sufficient structural integrity in the arrangement of cement grains to support low-amplitude shear stress and the evolution of a continuously connected network of cement particles within the paste is coincident with a rapid increase in the shear modulus of the porous skeleton. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XHJX8K-1&_user=6 [...]

Analysis of carbonation behavior in concrete using neural network algorithm and carbonation modeling / Seung-Jun Kwon in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 119-127 Titre : Analysis of carbonation behavior in concrete using neural network algorithm and carbonation modeling Type de document : texte imprimé Auteurs : Seung-Jun Kwon, Auteur ; Ha-Won Song, Auteur Article en page(s) : pp. 119-127 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Carbonation  Modeling  Diffusion  coefficient  Neural  network  Porosity Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Carbonation on concrete structures in underground sites or metropolitan cities is one of the major causes of steel corrosion in RC (Reinforced Concrete) structures. For quantitative evaluation of carbonation, physico-chemo modeling for reaction with dissolved CO2 and hydrates is necessary. Amount of hydrates and CO2 diffusion coefficient play an important role in evaluation of carbonation behavior, however, it is difficult to obtain a various CO2 diffusion coefficient from experiments due to limited time and cost. In this paper, a numerical technique for carbonation behavior using neural network algorithm and carbonation modeling is developed. To obtain the comparable data set of CO2 diffusion coefficient, experimental results which were performed previously are analyzed. Mix design components such as cement content, water to cement ratio, and volume of aggregate including exposure condition of relative humidity are selected as neurons. Training of learning for neural network is carried out using back propagation algorithm. The diffusion coefficient of CO2 from neural network are in good agreement with experimental data considering various conditions such as water to cement ratios (w/c: 0.42, 0.50, and 0.58) and relative humidities (R.H.: 10%, 45%, 75%, and 90%). Furthermore, mercury intrusion porosimetry (MIP) test is also performed to evaluate the change in porosity under carbonation. Finally, the numerical technique which is based on behavior in early-aged concrete such as hydration and pore structure is developed considering CO2 diffusion coefficient from neural network and changing effect on porosity under carbonation. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...] [article] Analysis of carbonation behavior in concrete using neural network algorithm and carbonation modeling [texte imprimé] / Seung-Jun Kwon, Auteur ; Ha-Won Song, Auteur . - pp. 119-127. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 119-127 Mots-clés : Carbonation  Modeling  Diffusion  coefficient  Neural  network  Porosity Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Carbonation on concrete structures in underground sites or metropolitan cities is one of the major causes of steel corrosion in RC (Reinforced Concrete) structures. For quantitative evaluation of carbonation, physico-chemo modeling for reaction with dissolved CO2 and hydrates is necessary. Amount of hydrates and CO2 diffusion coefficient play an important role in evaluation of carbonation behavior, however, it is difficult to obtain a various CO2 diffusion coefficient from experiments due to limited time and cost. In this paper, a numerical technique for carbonation behavior using neural network algorithm and carbonation modeling is developed. To obtain the comparable data set of CO2 diffusion coefficient, experimental results which were performed previously are analyzed. Mix design components such as cement content, water to cement ratio, and volume of aggregate including exposure condition of relative humidity are selected as neurons. Training of learning for neural network is carried out using back propagation algorithm. The diffusion coefficient of CO2 from neural network are in good agreement with experimental data considering various conditions such as water to cement ratios (w/c: 0.42, 0.50, and 0.58) and relative humidities (R.H.: 10%, 45%, 75%, and 90%). Furthermore, mercury intrusion porosimetry (MIP) test is also performed to evaluate the change in porosity under carbonation. Finally, the numerical technique which is based on behavior in early-aged concrete such as hydration and pore structure is developed considering CO2 diffusion coefficient from neural network and changing effect on porosity under carbonation. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...]

Assessment of phase formation in lime-based mortars with added metakaolin, Portland cement and sepiolite, for grouting of historic masonry / Alberto Sepulcre-Aguilar in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 66-76 Titre : Assessment of phase formation in lime-based mortars with added metakaolin, Portland cement and sepiolite, for grouting of historic masonry Type de document : texte imprimé Auteurs : Alberto Sepulcre-Aguilar, Auteur ; Francisco Hernandez-Olivares, Auteur Article en page(s) : pp. 66-76 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Blended  lime–cement  mortars  Restoration  mortars  Pozzolanic  additions  Metakaolin  Thermal  analysis Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Lime-based mortars containing pozzolanic additions of metakaolin, sepiolite and white Portland cement are studied in order to determine their performance as historic masonry conservation mortars. Hydration products on metakaolin–lime blended mortars include stable and metastable phases. The presence of such products has been studied by means of DTA and XRD analysis, concluding that the selection between them is mainly related with the water–lime ratio. Sepiolite addition to metakaolin–lime mortars has shown to inhibit C4AH13 formation. Therefore, the influence of phase distribution on the mechanical resistance is considered. Finally, compounds production on blended lime–white Portland cement was compared to natural hydraulic lime ones, and as a result, no remarkable differences appeared, apart from traces of possible cement Portland addition to the latter, usually not mentioned in the nominal composition supplied by the manufacturers of lime binders. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...] [article] Assessment of phase formation in lime-based mortars with added metakaolin, Portland cement and sepiolite, for grouting of historic masonry [texte imprimé] / Alberto Sepulcre-Aguilar, Auteur ; Francisco Hernandez-Olivares, Auteur . - pp. 66-76. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 66-76 Mots-clés : Blended  lime–cement  mortars  Restoration  mortars  Pozzolanic  additions  Metakaolin  Thermal  analysis Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Lime-based mortars containing pozzolanic additions of metakaolin, sepiolite and white Portland cement are studied in order to determine their performance as historic masonry conservation mortars. Hydration products on metakaolin–lime blended mortars include stable and metastable phases. The presence of such products has been studied by means of DTA and XRD analysis, concluding that the selection between them is mainly related with the water–lime ratio. Sepiolite addition to metakaolin–lime mortars has shown to inhibit C4AH13 formation. Therefore, the influence of phase distribution on the mechanical resistance is considered. Finally, compounds production on blended lime–white Portland cement was compared to natural hydraulic lime ones, and as a result, no remarkable differences appeared, apart from traces of possible cement Portland addition to the latter, usually not mentioned in the nominal composition supplied by the manufacturers of lime binders. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...]

Biogenic sulfuric acid attack on different types of commercially produced concrete sewer pipes / Ma. Guadalupe D. Gutiérrez-Padilla in Cement and concrete research, Vol. 40 N° 2 (02 ex.) (Fevrier 2010) 

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Changes in C3S hydration in the presence of cellulose ethers / J. Pourchez in Cement and concrete research, Vol. 40 N° 2 (02 ex.) (Fevrier 2010) 

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Characterization by solid-state NMR and selective dissolution techniques of anhydrous and hydrated CEM V cement pastes / F. Brunet in Cement and concrete research, Vol. 40 N° 2 (02 ex.) (Fevrier 2010) 

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Comparison between two ultrasonic methods in their ability to monitor the setting process of cement pastes / Gregor Trtnik in Cement and concrete research, Vol. 39 N° 10 (Octobre 2009) 

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Comprehensive modeling of chloride ion and water ingress into concrete considering thermal and carbonation state for real climate / David Conciatori in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010) 

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Comprehensive phase characterization of crystalline and amorphous phases of a Class F fly ash / Ryan T. Chancey in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010) 

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Critical chloride content in reinforced concrete — A review / Ueli Angst in Cement and concrete research, Vol. 39 N° 12 (Décembre 2009) 

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Determining the water–cement ratio, cement content, water content and degree of hydration of hardened cement paste: Method development and validation on paste samples / H.S. Wong in Cement and concrete research, Vol. 39 N° 10 (Octobre 2009) 

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Durability properties of micro-cracked ECC containing high volumes fly ash / Mustafa Şahmaran in Cement and concrete research, Vol. 39 N° 11 (Novembre 2009) 

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Dynamic behaviour and visco-elastic damage model of ultra-high performance cementitious composite / Jianzhong Lai in Cement and concrete research, Vol. 39 N° 11 (Novembre 2009) 

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