Abstract
This study reports on the properties of several types of blast-furnace slag (BFS) cement concrete and BFS cement concrete with fly ash (FA) substitution, as measured using specimens cured in water for 45 years. Ca leaching around the surface area of the specimens was confirmed, but compressive strength tended to develop with increases of BFS ratio in the case of long-term curing. In the case of BFS cement with 30% FA substitution, the compressive strength was higher than BFS cement after 10 years. This suggests that adding FA improves the long-term compressive strength of BFS cement. Vaterite produced on the surface area of the specimens containing FA was found to improve Vickers hardness by filling in micropores of the binder.
