Study of the physical behavior of partial replacement of fine aggregate by Botucatu sandstone residue in structural concrete

ABSTRACT

Several studies prove the feasibility of incorporating waste from civil construction into the concrete, but there are gaps in relation to research on the insertion of Botucatu sandstone waste and, in this sense, this study aims to analyze the physical behavior in concrete structural. Civil construction uses finite natural resources and the insertion of Botucatu tailings as a replacement for the natural aggregate may be convenient. In this analysis, the sandstone residues were characterized and selected for use in concrete dosages, with proportions of partial substitution in 10%, 20% and 30% of fine aggregate. Performance in the fresh state for slump was determined. In the hardened state, water absorption, specific mass and resistance to compression were determined at the age of 28 days. This last one presented potential value, respectively, according to the proportion of partial substitution 32,6; 28.6; 30.8 and 29.6 MPa. It was observed, in a statistical way, that the replacement of the fine aggregate, up to 30% content, remained constant in the physical behavior of the structural concrete.

Keywords
Botucatu Sandstone; Fine Aggregate; Structural Concrete; Compressive Strength