2022 Volume 76 Issue 1 Pages 2-9
In this study, the effects of different clinker constituent mineral ratios and curing temperatures on the C-S-H structure were investigated, mainly using FT-IR. In the FT-IR analysis, the second derivative curve of the spectrum was used to evaluate the formation and growth behavior of C-S-H. The intensity ratio of the C2S-derived Si-O stretching peak to the C-S-H-derived Si-O stretching peak, and the Si-O-Si variant peak width were used as an indicator of the amount of C-S-H formation and as a new indicator of the regularity of the Si chains in C-S-H, respectively. The results indicate that in samples with high C3S content, the regularity of the C-S-H Si chain is established in the initial stage of hydration, and that the C-S-H may grow with the regularity retained thereafter. On the other hand, in samples with high C2S content, the regularity of C-S-H Si chains is not established initially, indicating that the regularity may increase with C-S-H growth.
