Curing and Shrinkage Effect on the PMM/Concrete Bond, Using “Friction-transfer” and “Pull-off” Methods

The adhesion between the mortar and the substrate concrete depends on a number of factors including shrinkage, curing and use of modifying polymers. The methods of "Friction-transfer" and "Pull-off" are used to determine the mortar/concrete bond strength. The mortars used contained 10%, 15% and 20% styrene butadiene polymer, (related to cement weight). The results are compared with mortar with no added polymer. Three types of curing were employed. Mortars shrinkage was also investigated. The results tend to show the high impact of the polymer on the adhesion and shrinkage of the mortar. It was also seen that, a high correlation coefficient existed between the corresponding "Friction-transfer" and "Pull-off" results.