... C12A7, ACA, concrete accelerator, CAS No. 12042-68-1, cement addititve, shotcrete additive, concrete additivesACA are the white-green grains ... into fine powder, the ACA powder and OPC (ordinary portland cement) are formulate into Rapid-hardening Mortar and Self-leveling mortar ... make the rapid setting time, good strength in concrete and cement. It is mainly used in shotcrete, concrete ground hardening ...