Análise da adição de cinzas, provenientes da combustão da madeira, como material cimentício suplementar no concreto

Abstract

Concrete is one of the main elements of civil construction, used in numerous areas of the sector. The intensification of its use has stimulated the development of studies that aim to improve its mechanical properties, through the addition of alternative materials and additives to concrete. Among these, the use of materials with pozzolanic properties has shown satisfactory results in recent studies. In this context, this study aimed to analyze the characteristics and mechanical properties of concrete with the incorporation of ash from wood burning as a supplementary cementitious material. The study analyzed the changes in physical and mechanical characteristics, for the previously established concrete mix of 1: 1. 24: 2. 62; and for mixtures with the partial replacement of 5%, 10% and 15%, of cement by ash. Compression and traction tests were performed at ages of 7 and 28 days, as well as tests to define the voids index and absorption capacity of the concrete. The tests showed improvements in the compressive strength for the 5% ash content. However, for higher percentages, there was a reduction in the compressive strength of concrete. The tensile strength by axial compression showed similar results to the compression test. As for the absorption, a decrease in the absorption index was observed as a higher ash content was obtained. Therefore, the well­dosed ash mix can ensure favorable results for applicability as structural concrete.