Function aggregate (FA) is composed of a porous matrix with high strength and low water ab- sorption, and a reactive layer coated by the matrix, which can improve ITZ between aggregate and cement paste and control curing range of cement…
Function aggregate (FA) is composed of a porous matrix with high strength and low water ab- sorption, and a reactive layer coated by the matrix, which can improve ITZ between aggregate and cement paste and control curing range of cement paste. The ITZ between function aggregate and cement paste is stud- ied by SEM images and microhardness method. The width of the ITZ between hardened cement paste (hcp) and FA pellet is about 40µm. Compared to the matrix pellet, the interfacial bond between FA pellet and hcp is stronger. Further research should be focused on the mechanism of ITZ between hcp and FA pellet.