Avaliação do desempenho de argamassas com aditivo incorporador de ar para assentamento de blocos cerâmicos para alvenaria estrutural

Abstract

The laying mortar has a fundamental role in the joint performance of the structural masonry. This work aims to evaluate the air-entraining admixture (AEA) in the behavior of dosed mortars on site for laying structural masonry of ceramic block and comparing it to dosed mortar without admixture. Based on similar standards to some research and, as is also recommended by the British standard BS EN 5628-1 (1992), dosed mortars have a fixed ratio of 1:0.5:4.5 (by volume). The additive will be included in the mixtures in the proportions of 0% (reference line), 0.10% and 0.30%, in relation to the mass of the binders (cement and lime). The following properties in the fresh state will be evaluated according to current regulations: consistency index and incorporated air content. In the hardened state, the compressive strength, the tensile strength of both mortars and prisms will be evaluated, as well as the adhesion at the interface between the ceramic block and the mortar by pullout test. The results showed that by adding air-entraining admixture to the laying mortar, an improvement in its properties in the fresh state was verified, such as the workability of the mortar, and a reduction in the mechanical properties in the hardened state, also when used for laying ceramic structural block. Keywords: air-entraining admixture, settlement mortar, structural masonry, laying mortar.