Utilização de resíduo de Pinus spp. como substituição parcial ao agregado miúdo na produção de concreto

Abstract

The civil construction sector has been increasingly concerned with offering sustainable and quality materials, improving its techniques through testing and observation. The main objective of this work was to evaluate the feasibility of using pine residues in the production of concrete for structures, through the cement-wood composite, partially replacing the fine mineral aggregate by lignocellulosic aggregate. For this, cylindrical concrete specimens were produced with different levels of aggregate substitution, and then physical and mechanical tests were carried out on the samples, in order to obtain parameters such as compressive strength, void ratio, water absorption and specific mass. The results of the compressive strength tests showed that the concrete, with an aggregate replacement content above 10.0%, did not meet the requirements of NBR 8953 (ABNT, 2015), which provides for a characteristic compressive strength of at least 20 MPa for concrete for structural purposes. In the tests of specific mass, void index and water absorption, the results showed that the concrete produced with wood residue presented a reduction of up to 22% in the specific mass, while the void index increased by 179% and the absorption of water by 162%. The results show that, for the tests carried out, the smaller the addition of wood, the greater the compressive strength of the concrete. The specific mass, on the other hand, presented a satisfactory result, with a reduction as the replacement content of the aggregate increased.