A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence des fumées de silice sur l’évolution de l’hydratation des pâtes de chaux ou de Ciment Portland
Abstract The silica fume (SF) is used in civil engineering, in particular for the manufacture of high performance concrete. In order to better understand the gain in strength of the concretes containing SF, the microstructural aspect has been examined. Mixtures of SF–Lime pastes present a hydraulic setting which is due to the formation of a C–S–H phase (calcium silicate hydrate). The latter is semi-crystallized. It is characterized by the lines of X-ray diffraction, hk0 such as: 3,06 Å (220), 2,80 Å (400) and 1,83 Å (040). The mix design SF–Lime paste is thus a simplified approach of that of the mixtures SF–OPC in which the main reaction is the fixation, by the SF, of lime coming from the hydration of $ C_{3} $S in the form of C–S–H. Tests have been carried out on two varieties of SF resulting from the same furnace with the presence of lime or Portland cement. The results show that the presence of certain impurities, by their actions on the solubility of silica plays a significant role on the evolution of the hydration of the principal components of Portland cements and the kinetics of lime fixation by the SF. Among the impurities contained in the SF, carbon delays considerably the hydration of the principal components of Portland cement ($ C_{3} $S and $ C_{3} $A) as well as the pozzolanic reactivity of the silica fume without removing it.
Influence des fumées de silice sur l’évolution de l’hydratation des pâtes de chaux ou de Ciment Portland
Abstract The silica fume (SF) is used in civil engineering, in particular for the manufacture of high performance concrete. In order to better understand the gain in strength of the concretes containing SF, the microstructural aspect has been examined. Mixtures of SF–Lime pastes present a hydraulic setting which is due to the formation of a C–S–H phase (calcium silicate hydrate). The latter is semi-crystallized. It is characterized by the lines of X-ray diffraction, hk0 such as: 3,06 Å (220), 2,80 Å (400) and 1,83 Å (040). The mix design SF–Lime paste is thus a simplified approach of that of the mixtures SF–OPC in which the main reaction is the fixation, by the SF, of lime coming from the hydration of $ C_{3} $S in the form of C–S–H. Tests have been carried out on two varieties of SF resulting from the same furnace with the presence of lime or Portland cement. The results show that the presence of certain impurities, by their actions on the solubility of silica plays a significant role on the evolution of the hydration of the principal components of Portland cements and the kinetics of lime fixation by the SF. Among the impurities contained in the SF, carbon delays considerably the hydration of the principal components of Portland cement ($ C_{3} $S and $ C_{3} $A) as well as the pozzolanic reactivity of the silica fume without removing it.
Influence des fumées de silice sur l’évolution de l’hydratation des pâtes de chaux ou de Ciment Portland
Oudjit, Mohamed Nadjib (author) / Arroudj, Karima (author) / Bali, Abderrahim (author)
2006
Article (Journal)
English
| British Library Online Contents | 2007
| Taylor & Francis Verlag | 2001