The performance of RCC with large volume high calcium fly-ash

The volume stability of the cement paste with large amount(above 60 percent)of high-calcium fly ash is solved by adopting measures of the slaking、milling and match admixture. The tests indicate that the axial compressive and tensile strength and the elastic module of the RCC with large amount of high-calcium fly ash improve 10 percent than the common fly ash concrete's,while their limited tensile strains are equivalent.28days and 90 days both all express for the shrinkage,And the shrinkage-compensating action of the high-calcium fly ash is proved form the facts that the dry shrinkage and self-volume deformation of the concrete with large amount of high-calcium fly ash is only 50 percent of the common fly ash concrete's.The study proves that the performance of the RCC with large amount of high-calcium fly ash satisfy with the technique requirements of the large volume hydraulic concrete,and its technique and economic benefits are predominant than the common fly ash concrete's.