When high- strength BFS and fly ash composite cement were mixed with water, clinker minerals hydrated first and
released calcium hydroxide. Water phase was saturated by calcium hydroxide. Then the glass phase of BFS and fly ash
reacted with alkalis, and led to Si-O-Si, Al-O-Al links, etc. ruptured. It depolymerized to produce SiO44- , AlO45- , Ca2+, etc., which went into the solution and formed new hydrated calcium silicate and hydrated calcium aluminate. The latter went on to react with SO42- dissolved from gypsum, and derived AFt. In addition, hydro-grossularite, etc., hydrates were produced. The more amounts of mixed materials, the lower the clinker content, and the lower the
alkalinity would be reduced to. The decomposing reaction of the glass phase network for BFS and fly ash would be