Effect of Temperature on C^sub 3^S and C^sub 3^S + Nanosilica Hydration and C-S-H Structure

This study aimed to monitor the effect of temperature and the addition of nanosilica on the nanostructure of the C-S-H gel forming during tricalcium silicate (...) hydration. Two types of paste were prepared from a synthesized T1 ... The first consisted of a blend of deionized water and ... at a water/solid ratio of 0.425. In the second, a 90 wt% ... + 10 wt% of nanosilica blend was mixed with water at a water/solid ratio of 0.7. The pastes were stored in closed containers at 100% RH and 25...C, 40...C, or 65...C. The hydration reaction was detained after 1, 14, 28, or 62 d with acetone, and then pastes were studied by ... magic angle spinning nuclear magnetic resonance (... MAS NMR).The main conclusion was that adding nSA expedites ... hydration at any age or temperature and modifies the structure of the C-S-H gel formed, two types of C-S-H gel appear. At 25...C and 40...C, more orderly, longer chain gels are initially (1 d) obtained as a result of the pozzolanic reaction between nSA and portlandite (CH) (C-S-HII gel formation). Subsequently, ongoing ... hydration and the concomitant flow of dimers shorten the mean chain length in the gel. (ProQuest: ... denotes formulae/symbols omitted.)