EFFECT OF CURING TEMPERATURE ON THE CRYSTAL STRUCTURES OF C-（A）-S-H and Al-TOBERMORITE

Abstract

The purpose of this study is to consider the effects of curing temperature on the crystal structure of C-（A）-S-H and Al-tobermorite. In this study, γ-Al₂O₃ was added to the starting Ca and Si sources, and the samples were cured under various conditions. As a result, it was confirmed that 1.4nm tobermorite was formed by curing of the Al-free samples at 40℃ for 28 days. In addition, the addition of Al to the 1.4nm tobermorite under the formation process indicated the possibility of Al-substituted 1.1nm tobermorite formation even under 40℃ temperature conditions. Furthermore, it was confirmed that the peaks of Al at the pairing site in C-A-S-H and Al-substituted 1.1nm tobermorite appeared at different positions, according to ²⁷Al｛¹H｝DD/CP MAS NMR measurements.