Avaliação da influência do substrato de concreto na resistência de aderência à tração de diferentes tipos de chapisco

Abstract

The mortar coating is already used for many years and remains very still employed in construction. Neverthe-less, this subsystem did not follow the evolution of other technologies, such as structural concrete. It is increasingly common occurrence of damages in mortars, mainly when used over a concrete structure. In this context, this article has as objective verifies the adhesion of three slurry mortar types when applied in concretes with different compressive strength. Concrete substrates were produced with compressive strength of 17.75 MPa, 29.89 MPa and 35.15 MPa, where the adhesion tests were performed. The results showed that the increase of concrete strength reduces the adhesive strength, due to the minimization of porosity. Besides, the commercial mortars have better adhesive strength than the manual slurry mortars.