2023 Volume 77 Issue 1 Pages 137-144
The objective of this study was to clarify the effects of synthesis temperature and drying conditions on the formation of products by alkali-silica reaction （ASR）. ASR products were synthesized by varying both conditions, and the products, atomic bonding states, and heating dehydration behavior were evaluated. As a result, no ASR gel was formed at 40℃, but ASR gels were easily formed as the synthesis temperature increased up to 80℃. The ASR gels were also formed under different drying conditions. On the other hand, the formation of ASR gel did not change significantly under different drying conditions, but a change in the peak position of Si-O vibration in the ASR gel structure was observed in the FT-IR spectra. When considered together with the heating and dehydration behavior, it was considered that the water in the ASR gel structure dissipated with the progress of drying, and the state and bond distance of the Si-O bonds changed.
