Utilização de resíduos de beneficiamento de rochas ornamentais como fíler em misturas asfálticas.

Abstract

Civil construction is one of the most important sectors of the economy, being essential to the development of the country, but, consequently, it is considered one of the sectors that most consume natural resources, from the production of inputs used until the execution of the work and its operation. In this sequence, Brazil is recognized worldwide in the production and commercialization of ornamental rocks, which during the primary processing transform almost 30% of the blocks, by volume, into fine residues. The objective of this research was to evaluate the practical application of ornamental rock processing residue (RBRO) in asphalt mixtures, acting as filler material. For this purpose, studies were carried out on the mechanical properties of an asphalt mixture with CAP 50/70 and using different RBRO contents as a filler, replacing the lime content, and analyzing on the basis of results obtained for mixtures with addition of hydrated lime. In general, mixtures with RBRO addition were shown to be viable for use in pavement works, since the normative values were exceeded and the results obtained were equivalent to those of the reference mixture. It is concluded that the analysis of the resistance to permanent deformation was determinant to conclude that the 2% RBRO content in the mixture presents better performance.