Fundamental Study on Evaluation of Shear Bond Strength between Inorganic Materials

Abstract

Slant shear tests and direct shear tests were conducted to determine shear bond strength between inorganic materials. Shear bond strength of bonded interface between mortar and polymer cement mortar (PCM) obtained by slant shear test increased with an increase in compressive strength of PCM, but friction angle didn't change. Since this trend is consistent with general properties of inorganic materials, slant shear test would be a valid method to determine shear bond strength. Shear strength of mortar obtained by direct shear test, which is simpler method than slant shear test, was similar with that calculated from the Mohr-Coulomb failure criterion using compressive and tensile strength. Also, bond property of bonded interface between mortars obtained by direct shear test was similar with that obtained by slant shear test. Therefore, it seems reasonable to conclude that, regarding determination of shear bond strength, direct shear test can be an alternative method to slant shear test.