2021 Volume 75 Issue 1 Pages 105-112
In this study, experiments were conducted over a period of one year using hardened ordinary Portland cement with fly ash substituted at 0, 7, and 14％. Microstructural changes of fly ash particles during pozzolanic reaction and precipitated C-A-S-H were observed using FE-SEM. The relationship between the water vapor and nitrogen specific surface areas and the pozzolanic reaction was summarized, and the water vapor BET surface area increased and the nitrogen BET surface area decreased as the pozzolanic reaction progressed. This indicates that the C-A-S-H produced by the pozzolanic reaction decreases the LD C-S-H, which is as dense as the HD C-S-H.
