Incorporação de alumínio sólido como agregado miúdo na fabricação do concreto para a construção civil

Abstract

The use of materials in construction is a way to reuse materials and decrease the accumulation of the same. This work aims to evaluate the possibility of using aluminum as a small aggregate, replacing sand, in concrete, for the use of civil construction. The purpose of this work was to compare the strength and deformation obtained by conducting the simple compression test of the mixtures with 5% and 10% aluminum substitution and without aluminum substitution, as well as the analysis of the microstructure through SEM. The rupture without addition of aluminum presents in a columnar form (e), whereas the ruptures with addition (5% and 10%) do not fit the classification proposed by the standard. The average values of compressive strength and deformation obtained in the simple compression tests were as follows: without addition 10.98 MPa; 4.4 mm; replacement of 5% 3.35 MPa; 7.43 mm; replacement of 10% 2.83 MPa; 2.5 mm. The replacement of aluminum as a small aggregate decreases the strength of the concrete, as well as, the substitution additions accentuate this loss of resistance. Some factors relevant to the reduction in the resistance with the use of aluminum as small aggregate are: formation of a surface layer of oxide between the particles; the sharp difference in grain size between sand and aluminum.