Cement and concrete research, Vol. 39 N° 4. Cement and concrete research - Avril 2009
| Titre : | Cement and concrete research, Vol. 39 N° 4. Cement and concrete research - Avril 2009 |
| Type de document : | Bulletin |
| Paru le : | 15/11/2009 |
Dépouillements
Article : texte imprimé
Lin, Feng, Auteur ;
Christian Meyer, Auteur
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A hydration kinetics model for Portland cement is formulated based on thermodynamics of multiphase porous media. The mechanism of cement hydration is discussed based on literature review. The model is then developed considering the effects of ch[...]
Article : texte imprimé
Shashank Bishnoi, Auteur ;
Karen Scrivener, Auteur
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A new modelling platform, called µic has been developed to model the microstructural evolution of hydrating cement paste. The platform uses the vector approach and can be used for modelling particulate reactions including the hydration of many d[...]
Article : texte imprimé
Göril Möschner, Auteur ;
Barbara Lothenbach, Auteur ;
Renato Figi, Auteur
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Citric acid can be used to retard the hydration of cement. Experiments were carried out to investigate the influence of citric acid on the composition of solid and liquid phases during cement hydration. Analyses of the solid phases showed that d[...]
Article : texte imprimé
Xinping Ouyang, Auteur ;
Xinyuan Jiang, Auteur ;
Xueqing Qiu, Auteur
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The effect of the molecular weight of sulfanilic acid-phenol-formaldehyde condensate (SPF) on the properties of cementitious system was investigated. It is found that SPF with the molecular weight of 35,000 Dalton (Da) gives a good adsorption ca[...]
Article : texte imprimé
When powdered plaster (CaSO4·1/2H2O) is mixed with sufficient water to give a plastic paste, hydration occurs rapidly, forming a hardened mass of gypsum (CaSO4·2H2O), usually with slight bulk expansion. The addition of certain compounds can grea[...]
Article : texte imprimé
A non-destructive testing technique based on the time reversal principle is applied to cementitious materials. Preliminary results are presented showing the reversibility of wave propagation and that focusing by time reversal is feasible in ceme[...]
Article : texte imprimé
Jun Zhang, Auteur ;
Chengxu Gong, Auteur ;
Zili Guo, Auteur
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This paper reports a new class of engineered cementitious composite (ECC) with characteristics of low drying shrinkage, tight crack opening and high tensile strain capacity. Research emphasis is placed on the influence of different cementitious [...]
Article : texte imprimé
A. De Gasparo, Auteur ;
M. Herwegh, Auteur ;
R. Zurbriggen, Auteur
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The distributions of organic additives in self-leveling flooring compounds (SLCs) were investigated using laser-scanning microscopy for the selective visualization of the additives, which had been previously stained by a fluorescent dye. The dis[...]
Article : texte imprimé
Providing adequate moisture content in cement-based materials is important during hydration of the cement paste to ensure proper development of their mechanical and durability properties. Subsequently, water is involved in the deterioration of c[...]
Article : texte imprimé
Prince O'Neill Iqbal, Auteur ;
Tetsuya Ishida, Auteur
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In this research, the chloride penetration in concrete is modeled under marine environment loadings. Moisture migration model is enhanced to simulate the sorption flux under submerged wetting after long exposure to drying. The non-ideal viscosit[...]
Article : texte imprimé
Y. Elakneswaran, Auteur ;
T. Nawa, Auteur ;
K. Kurumisawa, Auteur
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In this study, surface charge mechanism of cement hydrates and its relations to adsorption of chloride ions are investigated. Hydrated cement paste (HCP) shows net positive surface charge by dissociation and adsorption. In HCP, chlorides bind as[...]
Article : texte imprimé
Christopher A. Jones, Auteur ;
Zachary C. Grasley, Auteur
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An experimental apparatus and analytical derivation are developed for quantifying the permeability of cementitious materials using dynamic pressurization of a hollow cylinder. Experimental results from the newly developed hollow dynamic pressuri[...]
Article : texte imprimé
Foams are being used in a number of petroleum industry applications that exploit their high viscosity and low density. Foamed cement slurries can have superior displacement properties relative to non-foamed cement slurries. This article presents[...]
Article : texte imprimé
John M. Stencel, Auteur ;
Haiping Song, Auteur ;
Federico Cangialosi, Auteur
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The use of a new automated foam index test (AFIT) instrument is discussed as a quantitative approach to observe air entraining agent (AEA) interactions with and to measure proper AEA dosage into cement–fly ash mixtures. Based on measuring acoust[...]
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