Experimental work including splitting tensile, three point bending, and direct shear tests on PCM-concrete composite specimens with various interface roughness R and substrate concrete was con- a ducted. The PCM-concrete bond strength, fracture energy as well as fractured surface were…
Experimental work including splitting tensile, three point bending, and direct shear tests on PCM-concrete composite specimens with various interface roughness R and substrate concrete was con- a ducted. The PCM-concrete bond strength, fracture energy as well as fractured surface were investigated quali- titatively and quantitatively. In case the substrate concrete was untreated, the bond strength as well as fracture energy was rather small, and the fracture developed along the PCM-concrete adhesion layer with even sur- face. The bond strength and fracture energy kept increasing with increase of interface roughness until the fracture mode was shifted from PCM-concrete adhesion layer to concrete cohesion layer. The effect of aggre- gate type (river gravel or crushed rock) on bond strength and fracture energy was not distinct. Regarding the bond properties and retrofitting cost, the R ≈1 mm (0.9 ≤ R ≤1.1 mm) could be the optimum value of inter- a a face roughness.