Determinação das propriedades de aderência e físicas de argamassas de revestimento com substituição parcial do cimento Portland por adições minerais

Abstract

The use of mortar with Portland cement in the masonry coating is a traditional technique that has been improving and evolving more and more due to the large number of works being executed in the country. The development of projects and techniques has been increasingly used in order to avoid future pathologies and seek a longer useful life of these coatings. In this way, it is sought to improve the efficiency and productivity of coating mortars with the help of bulk pozolanic substitutions of rice husk, fly ash and metakaolin, since reducing cement consumption and using materials previously discarded by society, emissions of carbon dioxide into the atmosphere can be reduced. Within the execution processes, there is a great concern as to the adhesion of the mortar to the surface to which it will be in contact. For a better understanding of some factors that influence the tensile strength between the mortar coating layer and the masonry, the present work presents the results of adhesion tests according to ABNT NBR 13528: 2010, made in masonry walls with blocks with the use of slabs. For the accomplishment of this work, a trait of coating of 8 MPa of compressive strength was used as reference. The best results in terms of tensile strength were the traces of 5% silica from the rice husk with 15% fly ash and 5% silica from the rice husk with 10% metakaolin.