Influência da utilização da solução de cal em substituição à água de amassamento de chapisco e emboço para revestimento.

Abstract

The mechanical behavior of coatings is an extremely important theme for a better understanding of the bonded systems, especially at the interface between the mortar and the base. Physical adherence is related, among other things, to the contents of the materials used in the spatterdash and plaster, due to the necessary colloidal water penetration in the pores of the substrate, providing mechanical locking of hydrated calcium sulfoaluminate and calcium silicate crystals, according to the principle of active pores. This study proposes to evaluate the influence of the use of this lime solution in substitution of the mixture water in the preparation of spatterdash and plaster, with contents of 0% (reference), 5%, 10% and 15% in relation to the amount of water. The experiment included the preparation of masonry panels (220x180)cm, prepared with concrete blocks and ceramic bricks. Direct tensile bond strength tests were performed, and the results showed significant differences for levels from 10% of lime in the spatterdash, in both base types, reaching increments of up to 39%. in relation to the reference sample, behavior that was not identified in the plaster samples.