Efeito de adições minerais sobre a resistência à tração na flexão, à compressão e na trabalhabilidade de argamassas

Abstract

The environmental impacts caused by human activity have driven, over the past decade, a growing demand for alternative materials, encouraging research aimed at finding options with lower ecological impact. The use of mineral additions with Portland cement is a viable solution for producing more sustainable mortars, while also contributing to improvements in mechanical strength and workability. These additions primarily act by filling the voids between cement grains, increasing workability, reducing porosity, and consequently enhancing strength. This study investigated the effects of the partial replacement of Portland cement with three types of rock powders from the Serra Geral Formation on the workability and mechanical properties of mortars. For this purpose, samples with cement replacement levels of 5%, 10%, and 15% were evaluated, along with a control mortar containing no replacement. The assessed properties included workability, compressive strength, and flexural tensile strength. The results indicated that mortars containing rock powders exhibited improved workability without significant loss of mechanical strength, along with a potential increase in strength over time. Thus, the findings demonstrate the technical feasibility of incorporating these mineral additions without compromising the mixture's strength and workability. Finally, this study suggests that the use of local waste materials as mineral additions does not compromise the physical strength of mortars, showing significant potential - particularly at a 5% replacement level?to enhance their properties. Moreover, this approach stands out as a sustainable solution, contributing to the reduction of CO² emissions in the construction industry. [resumo fornecido pelo autor]