ABSTRACT
Abstract An instrumented drop impact machine was used to study the interfacial fracture between concrete and rock using both limestone and granite. Two different types of " interfacial surface" were investigated. One was both flat and smooth; the other was obtained by splitting a limestone or granite block through impact loading, thereby producing a rough surface. Concrete was then cast on top of each type of surface. These blocks were subjected to splitting tension along the interfacial plane. The results in terms of the fracture energy and the splitting tensile strength are discussed; it was found that the bond strength is higher under impact loading, and that the bond between concrete and granite was stronger than that between concrete and limestone. Keywords: Impact, concrete, rock, interface, fracture.
