Abstract
Tricalcium silicate and Fe‐bearing alite pastes hydrated 4 years and portland cement paste hydrated 33 days were studied by SEM, TG, and XRD. SEM studies of the effect of water, NaCl, and MgSO4 solutions on the microstructure of alite are reported. The characteristics of the attack were clarified by examining both sides of the fracture plane. The Ca(OH)2 phase present in the fresh fracture surface is very unstable toward water, NaCl, and MgSO4 solutions. When exposed to MgSO4 solution the Ca(OH)2 reacts, producing Mg(OH)2 and CaSO4·2H2O. The C‐S‐H gel phase is more resistant to the various reactants. The presence of calcite, aragonite, and Ca(OH)2 and their proportion in the surface layer depend on the characteristics of the environment.
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