混合，掺和
4.The amount of plaster of Paris combined with common plaster to speed setting of the mixture.
5.The authors of this paper aimed at the present state in which the high quality dry fly ash suitably to used as the active admixture of high performance concrete is small and most of it is low class wet fly ash,developed the class 525R～625R special cement for high performance concrete adopted pre activated wet fly ash used as addition of cement,as well as by adding superplasticizer and limestone powder etc. admixture by orthogonal experiments.
