Estudo de argamassas de assentamento de blocos cerâmicos em alvenaria de vedação interna com base nos critérios de desempenho da ABNT NBR 15725-4:2003.

Abstract

The increasing demand for the high quality for buildings in the construction sector has been growing steadily. In order to reach this demand and ensure the quality of services, establishing requirements and efficiency standards are the key. Thus, the Performance Standard of Housing Buildings ABNT NBR 15575: 2013 came as na answer for this demand. Therefore, for each building subsystem, quantitative criteria are established in order to guarantee minimum quality standards, offering gains to designers, builders and users. In this research, the structural performance of internal vertical masonry was verified, based on the study of the behavior of ceramic block laying mortars. To estimate the strength of the masonry system by means of the soft-body impact tests, two masonry panels were produced, using for each prototype a laying mortar trace: 1:2:8 and 1:1:7 strokes. Thus, the behavior of the mortar in the fresh and hardened state was studied, being performed the tests of mortar consistency index, mass density and determination of compressive strength at 7, 14 and 28 days. The results indicated a higher resistance of the 1:2:8 stroke by soft-body impacts on the seal, since displacement values (maximum and instantaneous) were lower than the 1:1:7 stroke displacements and the limits imposed by ABNT NBR 15575-4: 2013. This is probably due to the higher compressive strength of mortar at the age of 28 days. Therefore, based on the results of the transverse displacements in the two masonry, it was found, according to the criteria of ABNT NBR 15575-4: 2013, a satisfactory performance level, identifying the stable behavior of the walls and non occurrence of the Ultimate Limit State (ULS).