2022 Volume 76 Issue 1 Pages 145-152
The present study experimentally examined the factors affecting the formation behavior of the alkali-silica reaction （ASR） products. In order to synthesize ASR products using reagents, samples were prepared by varying Ca/Si ratio, K/Na ratio and drying temperature, and the products and atomic bonding states of the synthesized samples were measured. As a result, ASR gels were stably formed with Ca/Si ratio in the range of 0.2 to 0.4. ASR gels were easily formed with high K/Na ratios, while C-S-H formation was predominant with low K/Na ratios. This may be due to the fact that Na-substituted C-S-H is more likely to form in the presence of large amounts of Na with low K/Na ratios. Only ASR gel was observed in the samples dried at 110℃, while crystalline material was also formed in the 50℃ dried samples. These results suggest that the products may change depending on the drying temperature.
