Influences of Carbonation and Surface Roughness of Concrete on Shear Bond Strength to Inorganic Repair Material

Abstract

Shear bond strength between inorganic repair material and concrete with different conditions of carbonation and surface roughness were evaluated. It was confirmed that shear bond strength increased with an increase in roughness of concrete surface. The relationship between shear bond strength and arithmetical mean roughness of specimens with carbonated concrete was almost identical with that of specimens with non-carbonated concrete. These results lead to the conclusion that carbonation of concrete doesn't influence shear bond strength to inorganic repair material. On the other hand, specimens with mortar with very smooth surface prepared according to JIS R 5201 showed lower shear bond strength than that of specimens with carbonated or non-carbonated concrete. Therefore, it is reasonable to evaluate shear bond strength using specimens made of above-mentioned mortar or concrete with smooth surface to avoid overestimations.