Shear Adhesion Properties of Epoxy Resin Adhesives

Tests are reported to investigate the shear bond strength of epoxy resin adhesives to concrete and steel adherents. Two types of tests were carried out on composite steel-epoxy-concrete specimens — pull out tests, in which failure always occurred through the concrete — glue bond, and single and double lap tests to examine the epoxy shear adhesion to steel adherents. It was found that the distribution of the longitudinal forces and shear stresses along the joint was exponential for both types of tests. The shear bond strength of epoxy to concrete varied almost linearly with concrete strength. However, variations in the adhesive layer thickness, in the range 0.5 to 3.0 mm, had practically no effect on the strength of the pull out or double lap specimens. The results obtained show that both the pull out and double lap shear tests can be carried out with a good degree of accuracy and consistency.