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Published on: July 8, 2021
Nanostructure of calcium silicate hydrates in cements
L B Skinner1, S R Chae, C J Benmore
1Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, USA.
Abstract:
Calcium silicate hydrate (CSH) is the major volume phase in the matrix of Portland cement concrete. Total x-ray scattering measurements with synchrotron x rays on synthetic CSH(I) shows nanocrystalline ordering with a particle diameter of 3.5(5) nm, similar to a size-broadened 1.1 nm tobermorite crystal structure. The CSH component in hydrated tricalcium silicate is found to be similar to CSH(I). Only a slight bend and additional disorder within the CaO sheets is required to explain its nanocrystalline structure.
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