Abstract
A systematic study of pure tricalcium silicate (C3S) samples hydrated in hydrothermal conditions from room temperature to 160°C has been done, in order to follow the hydration kinetics and the evolution of the calcium silicate hydrates (C-S-H) structure. MAS and CPMAS 29Si NMR allowed to determine the silicate skeleton of the hydrates. It was shown that the increase of synthesis temperature and time of hydration lengthen the silicate chains of C-S-H, based on dimers linked together by bridging SiO4 tetrahedra, like in tobermorite structure. When silica fume is added to anhydrous C3S, C-S-H phases result from two complexe chemical reactions: C3S hydration and silica fume reaction with calcium ions, especially those coming from portlandite dissolution. Some careful CRAMPS experiments allowed us to distinguish the Ca-OH protons of C-S-H and those of portlandite and to follow the two reaction kinetics.
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