... aluminate, non crystallized calcium aluminate, amorphous C12A7, ACA, concrete accelerator, CAS No. 12042-68-1, cement addititve, ... shotcrete additive, concrete additivesACA are the white-green grains and balls. Generally, the grains are ground ... setting time, good strength in concrete and cement. It is mainly used in shotcrete, concrete ground hardening and rapid setting etc.CAS No ...