Research on the methods of reducing cement unhydrated in high strength concrete

Abstract：Double_adding and tri_adding mineral admixtures can provide concrete containing large quantities of mineral admixtures with better fluidity, and higher strength and it greatly improve compaction of harden concrete and the cement paste_aggregate interfacial structure. As a result, the cement unhydrated in harden concrete has been reduced, the penetration of exterior water has been restrained, and the damage caused by the further hydration of cement unhydrated is finally eliminated.

Keyword：high strength concrete; cement unhydrated; mineral admixtures; doubleadding and triadding;