Experimental study of interfacial transition zones between geopolymer binder and recycled aggregate

This paper experimentally studies the interfacial transition zone (ITZ) between geopolymer binder (GP) and recycled aggregate (RA). Since RA consists of exposed stone surfaces and the attached paste/mortar from the original ordinary Portland cement (OPC) concrete, both the ITZ between GP and natural aggreate (NA) and that between GP and residual OPC paste/mortar (ROPM) were studied. For comparison, the ITZ between OPC paste and NA and that...