0000000000382589
AUTHOR
H. Minard
showing 3 related works from this author
Study of "alite-tricalcium silicate-gypsum"complex system
2007
International audience; The systematic study of “alite-C3A-gypsum” systems by using simultaneously the dynamic mode rheometry and the isothermal microcalorimetry made it possible to specify interactions between the different components and to quantify the effect of the mixtures on the cohesive properties of C-S-H. In the system “alite-C3A”, the presence of aluminate ions decreases both the growth rate of C-S-H and the ratio dG' /dQ which represents the increase in the elastic modulus dG' corresponding to the formation of a certain quantity of C-S-H, estimated by released heat dQ; for the great quantities of C3A, there is a positive effect of the surface developed by calcium hydroaluminates …
Apports de la rhéométrie dynamique et du couplage rhéométrie-microcalorimétrie pour l'étude de la cohésion des pâtes de ciment
2008
National audience; Le passage de la pâte de ciment d'un matériau mou à un solide dur se produit en plusieurs étapes successives. Tout d'abord, les grains anhydres coagulent pour former une structure connectée, puis, les hydrosilicates de calcium (noté C-S-H) qui sont les principaux produits d'hydratation du ciment précipitent sur la surface des grains en particulier aux points de contact préalablement formés et vont ainsi former la phase percolante de la matrice cimentaire. Ces hydrosilicates, particules nanométriques, renforcent la structure en augmentant la surface de contact entre les grains. La cohésion de la pâte de ciment augmente alors avec la quantité d'hydrates formée. Une fois que…
Hydration of silicate phase and mechanical evolution in 'alite-tricalcium aluminate-gypsum' complex system
2007
International audience; Using simultaneously the dynamic mode rheometry and the calorimetry, it has been possible to specify interactions between the components of “alite-C3A-gypsum” system. The concept of "mechanical efficiency of calcium silicate hydrates" (R = dG' /dQ, is the increase in the elastic modulus dG' corresponding to the formation of a certain quantity of CSH, estimated by released heat dQ) was introduced to quantify the effect of the mixtures on the cohesive properties of C-S-H. For the system alite-C3A : the presence of aluminate ions decreases both the growth rate of CSH and R; for the great quantities of C3A, there is a positive effect of the surface developed by AFm on R.…