Bond strength assessment for different types of repair materials

Abstract EN

The main objective of this work is to evaluate the bond strength for different types of repair materials.

Three test methods; slant shear, splitting prism and Bi-Surface shear test with conventional and two polymer modified repair mortars were used, The conventional mortar (MC), polymer modified mortar (MSBR) was prepared by admixing SBR 15% of cement weight, polymer modified and fiber reinforced repair mortar named commercially Compact S (MCS) was prepared by mix Compact S with a water ratio of 0.2.

The results show that the use of SBR and Compact S improves the bond strength of repair mortar compared with conventional repair mortar but the percentage increased with Compact S was greater than SBR.

The percentage increase in bond strength for concrete substrate repaired with Mcs (CMcs) were 52.67, 174.8, and 46.7% for Slant Shear, Splitting Prism and Bi-Surface shear test respectively relative to the corresponding repaired with conventional mortar MC(CMC); while, the corresponding percentages increase for concrete substrate repaired with MSBR (CMSBR) was 45.13, 129 and 30%.

It is found that the bond strengths obtained from some tests was up to an average of four times larger than those obtained from others.