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691 : Matériaux de construction. Pièces et parties composantes
Ouvrages de la bibliothèque en indexation 691
Affiner la rechercheThe evolution of strength and crystalline phases for alkali-activated ground blast furnace slag and fly ash-based geopolymers / Jae Eun Oh in Cement and concrete research, Vol. 40 N° 2 (02 ex.) (Fevrier 2010)
[article]
in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 189-196
Titre : The evolution of strength and crystalline phases for alkali-activated ground blast furnace slag and fly ash-based geopolymers Type de document : texte imprimé Auteurs : Jae Eun Oh, Auteur ; Paulo J.M. Monteiro, Auteur ; Ssang Sun Jun, Auteur Année de publication : 2010 Article en page(s) : pp. 189-196 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Alkali-activated cement Geopolymer X-ray diffraction Fly ash Granulated blast furnace slag Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The increase in strength and evolution of crystalline phases in inorganic polymer cement, made by the alkali activation of slag, Class C and Class F fly ashes, was followed using compressive strength test and synchrotron X-ray diffraction. In order to increase the crystallinity of the product the reactions were carried out at 80 °C. We found that hydrotalcite formed in both the alkali-activated slag cements and the fly ash-based geopolymers. Hydroxycancrinite, one member of the ABC-6 family of zeolites, was found only in the fly ash geopolymers. Assuming that the predominantly amorphous geopolymer formed under ambient conditions relates to the crystalline phases found when the mixture is cured at high temperature, we propose that the structure of this zeolitic precursor formed in Na-based high alkaline environment can be regarded as a disordered form of the basic building unit of the ABC-6 group of zeolites which includes poly-types such as hydroxycancrinite, hydroxysodalite and chabazite-Na.
DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XNVTFP-1&_user=6 [...] [article] The evolution of strength and crystalline phases for alkali-activated ground blast furnace slag and fly ash-based geopolymers [texte imprimé] / Jae Eun Oh, Auteur ; Paulo J.M. Monteiro, Auteur ; Ssang Sun Jun, Auteur . - 2010 . - pp. 189-196.
Génie Civil
Langues : Anglais (eng)
in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 189-196
Mots-clés : Alkali-activated cement Geopolymer X-ray diffraction Fly ash Granulated blast furnace slag Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The increase in strength and evolution of crystalline phases in inorganic polymer cement, made by the alkali activation of slag, Class C and Class F fly ashes, was followed using compressive strength test and synchrotron X-ray diffraction. In order to increase the crystallinity of the product the reactions were carried out at 80 °C. We found that hydrotalcite formed in both the alkali-activated slag cements and the fly ash-based geopolymers. Hydroxycancrinite, one member of the ABC-6 family of zeolites, was found only in the fly ash geopolymers. Assuming that the predominantly amorphous geopolymer formed under ambient conditions relates to the crystalline phases found when the mixture is cured at high temperature, we propose that the structure of this zeolitic precursor formed in Na-based high alkaline environment can be regarded as a disordered form of the basic building unit of the ABC-6 group of zeolites which includes poly-types such as hydroxycancrinite, hydroxysodalite and chabazite-Na.
DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XNVTFP-1&_user=6 [...] Thermal properties of hydrating calcium aluminate cement pastes / Neven Ukrainczyk in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010)
[article]
in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 128-136
Titre : Thermal properties of hydrating calcium aluminate cement pastes Type de document : texte imprimé Auteurs : Neven Ukrainczyk, Auteur ; Tomislav Matusinovic, Auteur Article en page(s) : pp. 128-136 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Calcium aluminate cement Hydration Thermal properties Transient hot wire method Inverse problem Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : As the hydration of calcium aluminate cements (CAC) is highly temperature dependent, yielding morphologically and structurally different hydration products that continuously alter material properties, a good knowledge of thermal properties at early stages of hydration is essential. Thermal diffusivity and thermal conductivity during CAC hydration was investigated by a transient method with a numerical approach and a transient hot wire method, respectively. For hydration at 15 °C (formation of mainly CAH10), thermal diffusivity shows a linear decrease as a function of hydration degree, while for hydration at 30 °C there is a linear increase of thermal diffusivity. Converted materials exhibited the highest values of thermal diffusivities. The results on sealed converted material indicated that thermal conductivity increased with an increase in temperature (20–80 °C), while thermal diffusivities marginally decreased with temperature. The Hashin–Shtrikman boundary conditions and a simple law of mixtures were successfully applied for estimating thermal conductivity and heat capacity, respectively, of fresh cement pastes.
DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...] [article] Thermal properties of hydrating calcium aluminate cement pastes [texte imprimé] / Neven Ukrainczyk, Auteur ; Tomislav Matusinovic, Auteur . - pp. 128-136.
Génie Civil
Langues : Anglais (eng)
in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 128-136
Mots-clés : Calcium aluminate cement Hydration Thermal properties Transient hot wire method Inverse problem Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : As the hydration of calcium aluminate cements (CAC) is highly temperature dependent, yielding morphologically and structurally different hydration products that continuously alter material properties, a good knowledge of thermal properties at early stages of hydration is essential. Thermal diffusivity and thermal conductivity during CAC hydration was investigated by a transient method with a numerical approach and a transient hot wire method, respectively. For hydration at 15 °C (formation of mainly CAH10), thermal diffusivity shows a linear decrease as a function of hydration degree, while for hydration at 30 °C there is a linear increase of thermal diffusivity. Converted materials exhibited the highest values of thermal diffusivities. The results on sealed converted material indicated that thermal conductivity increased with an increase in temperature (20–80 °C), while thermal diffusivities marginally decreased with temperature. The Hashin–Shtrikman boundary conditions and a simple law of mixtures were successfully applied for estimating thermal conductivity and heat capacity, respectively, of fresh cement pastes.
DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...] Triaxial strength and failure criterion of plain high-strength and high-performance concrete before and after high temperatures / Zhen-jun He in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010)
[article]
in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 171-178
Titre : Triaxial strength and failure criterion of plain high-strength and high-performance concrete before and after high temperatures Type de document : texte imprimé Auteurs : Zhen-jun He, Auteur ; Yu-pu Song, Auteur Article en page(s) : pp. 171-178 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : High-strength high-performace concrete HSHPC High temperatures Stress ratios Triaxial strengths Failure criterion Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Triaxial tests were performed on 100 mm × 100 mm × 100 mm cubic specimens of plain high-strength and high-performace concrete (HSHPC) at all kinds of stress ratios after exposure to normal and high temperatures of 20, 200, 300, 400, 500, and 600 °C, using a large static–dynamic true triaxial machine. Friction-reducing pads, using three layers of plastic membrane with glycerine were placed between the compressive loading plate and the specimens; the tensile loading planes of concrete samples were processed by an attrition machine, and then the samples were glued-up with the loading plate with structural glue. The failure mode characteristic of the specimens and the direction of the crack were observed and described. The three principally static strengths in the corresponding stress state were measured. The influence of the temperatures and stress ratios on the triaxial strengths of HSHPC after exposure to high temperatures was also analyzed. The experimental results showed that the uniaxial compressive strength of plain HSHPC after exposure to high temperatures does not decrease completely with the increase in temperature, the ratios of the triaxial to its uniaxial compressive strength are dependent on the brittleness–stiffness of HSHPC after different temperatures and the stress ratios. On this basis, a new failure criterion with the temperature parameters is proposed for plain HSHPC under multiaxial stress states. It provides the experimental and theoretical foundations for strength analysis of HSHPC structures subject to complex loads after subjected to a high temperature environment.
DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...] [article] Triaxial strength and failure criterion of plain high-strength and high-performance concrete before and after high temperatures [texte imprimé] / Zhen-jun He, Auteur ; Yu-pu Song, Auteur . - pp. 171-178.
Génie Civil
Langues : Anglais (eng)
in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 171-178
Mots-clés : High-strength high-performace concrete HSHPC High temperatures Stress ratios Triaxial strengths Failure criterion Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Triaxial tests were performed on 100 mm × 100 mm × 100 mm cubic specimens of plain high-strength and high-performace concrete (HSHPC) at all kinds of stress ratios after exposure to normal and high temperatures of 20, 200, 300, 400, 500, and 600 °C, using a large static–dynamic true triaxial machine. Friction-reducing pads, using three layers of plastic membrane with glycerine were placed between the compressive loading plate and the specimens; the tensile loading planes of concrete samples were processed by an attrition machine, and then the samples were glued-up with the loading plate with structural glue. The failure mode characteristic of the specimens and the direction of the crack were observed and described. The three principally static strengths in the corresponding stress state were measured. The influence of the temperatures and stress ratios on the triaxial strengths of HSHPC after exposure to high temperatures was also analyzed. The experimental results showed that the uniaxial compressive strength of plain HSHPC after exposure to high temperatures does not decrease completely with the increase in temperature, the ratios of the triaxial to its uniaxial compressive strength are dependent on the brittleness–stiffness of HSHPC after different temperatures and the stress ratios. On this basis, a new failure criterion with the temperature parameters is proposed for plain HSHPC under multiaxial stress states. It provides the experimental and theoretical foundations for strength analysis of HSHPC structures subject to complex loads after subjected to a high temperature environment.
DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...] Unified modeling of setting and strength development / R.C.A. Pinto in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010)
[article]
in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 58-65
Titre : Unified modeling of setting and strength development Type de document : texte imprimé Auteurs : R.C.A. Pinto, Auteur ; A.K. Schindler, Auteur Article en page(s) : pp. 58-65 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Maturity method Aging Compressive strength Temperature Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The effect of temperature on the development of concrete compressive strength can be modeled by the maturity approach once the temperature sensitivity of the mixture, quantified by the activation energy (Ea) of its chemical reactions, is known. It is common in maturity applications to use a unique value of Ea obtained for the hardening period, even though the effect of temperature is different on the rate of setting and hardening. Ea-values presented in the literature suggest that the temperature sensitivity is lower before hardening. This paper proposes a new approach to the traditional maturity method unifying the distinctly different temperature sensitivities before final setting and during hardening. Results of setting and compressive strength of mixtures with different cementitious materials were analyzed with activation energy values calculated for the periods before final setting and during hardening. For the investigated mixtures, the new approach led to improved strength predictions, suggesting that it is useful to take into account setting behavior in the development of the strength–maturity relationship.
DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4X6DBN1-2&_user=6 [...] [article] Unified modeling of setting and strength development [texte imprimé] / R.C.A. Pinto, Auteur ; A.K. Schindler, Auteur . - pp. 58-65.
Génie Civil
Langues : Anglais (eng)
in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 58-65
Mots-clés : Maturity method Aging Compressive strength Temperature Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The effect of temperature on the development of concrete compressive strength can be modeled by the maturity approach once the temperature sensitivity of the mixture, quantified by the activation energy (Ea) of its chemical reactions, is known. It is common in maturity applications to use a unique value of Ea obtained for the hardening period, even though the effect of temperature is different on the rate of setting and hardening. Ea-values presented in the literature suggest that the temperature sensitivity is lower before hardening. This paper proposes a new approach to the traditional maturity method unifying the distinctly different temperature sensitivities before final setting and during hardening. Results of setting and compressive strength of mixtures with different cementitious materials were analyzed with activation energy values calculated for the periods before final setting and during hardening. For the investigated mixtures, the new approach led to improved strength predictions, suggesting that it is useful to take into account setting behavior in the development of the strength–maturity relationship.
DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4X6DBN1-2&_user=6 [...] Use of bacteria to repair cracks in concrete / Kim Van Tittelboom in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010)
[article]
in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 157-166
Titre : Use of bacteria to repair cracks in concrete Type de document : texte imprimé Auteurs : Kim Van Tittelboom, Auteur ; Nele de Belie, Auteur ; Willem de Muynck, Auteur Article en page(s) : pp. 157-166 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete Microcracking CaCO3 Bacteria Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : As synthetic polymers, currently used for concrete repair, may be harmful to the environment, the use of a biological repair technique is investigated in this study. Ureolytic bacteria such as Bacillus sphaericus are able to precipitate CaCO3 in their micro-environment by conversion of urea into ammonium and carbonate. The bacterial degradation of urea locally increases the pH and promotes the microbial deposition of carbonate as calcium carbonate in a calcium rich environment. These precipitated crystals can thus fill the cracks. The crack healing potential of bacteria and traditional repair techniques are compared in this research by means of water permeability tests, ultrasound transmission measurements and visual examination. Thermogravimetric analysis showed that bacteria were able to precipitate CaCO3 crystals inside the cracks. It was seen that pure bacteria cultures were not able to bridge the cracks. However, when bacteria were protected in silica gel, cracks were filled completely.
DEWEY : 627 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...] [article] Use of bacteria to repair cracks in concrete [texte imprimé] / Kim Van Tittelboom, Auteur ; Nele de Belie, Auteur ; Willem de Muynck, Auteur . - pp. 157-166.
Génie Civil
Langues : Anglais (eng)
in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 157-166
Mots-clés : Concrete Microcracking CaCO3 Bacteria Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : As synthetic polymers, currently used for concrete repair, may be harmful to the environment, the use of a biological repair technique is investigated in this study. Ureolytic bacteria such as Bacillus sphaericus are able to precipitate CaCO3 in their micro-environment by conversion of urea into ammonium and carbonate. The bacterial degradation of urea locally increases the pH and promotes the microbial deposition of carbonate as calcium carbonate in a calcium rich environment. These precipitated crystals can thus fill the cracks. The crack healing potential of bacteria and traditional repair techniques are compared in this research by means of water permeability tests, ultrasound transmission measurements and visual examination. Thermogravimetric analysis showed that bacteria were able to precipitate CaCO3 crystals inside the cracks. It was seen that pure bacteria cultures were not able to bridge the cracks. However, when bacteria were protected in silica gel, cracks were filled completely.
DEWEY : 627 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...] Water absorption in internally cured mortar made with water-filled lightweight aggregate / Ryan Henkensiefken in Cement and concrete research, Vol. 39 N° 10 (Octobre 2009)
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