TEST METHOD FOR MEASURING THE BOND STRENGTH OF LATEX-MODIFIED CONCRETE AND MORTAR

The paper describes a test method that accurately measures the strength of the bond of latex modified mortar and concrete to conventional concrete. Using 3 in. diameter cylinders of concrete as the base material and standard 3 in. diameter steel pipe nipples as molds, an overlay of the latex modified material is applied and cured similar to field conditions and then tested in direct tension. The results not only give values of the bond strength of the overlay tested but also clearly indicate whether the failure is in the bond or the materials tested. This test also has potential for application to other nonlatex-modified systems.