Avaliação de misturas de resíduos da construção e demolição (RCD) com solo residual de basalto para uso em obras de pavimentação

Abstract

The large volume of Construction and Demolition Waste (CDW) generated in Brazil presents itself as a problem because it occupies large areas in inert landfills, and one of the ways to minimize this fact is through the reuse of CDW in paving services. Thus, this work seeks to evaluate the technical feasibility of different mixtures of CDW with residual basalt soil in paving services through characterization, compaction, California Bearing Ratio (CBR) and permeability tests. The tested samples presented 0%, 20%, 40%, 60%, 80% and 100% of waste content. For the compaction test, there was an increase in the maximum dry specific weight and a decrease in the optimal moisture content with the addition of waste. As for the granulometry, a decrease in the fines content was observed with the addition of CDW in the clayey soil. In relation to the CBR, an increase in soil resistance values was observed as the CDW content was increased in the mixtures, and the opposite occurred for the expansion of the samples, which presented a reduction in percentagem with the addition. Finally, it is concluded that not all mixtures are viable to be used in paving services such as base and subbase layers, due to non-compliance with the minimum parameters required by NBR 15115, with the exception of the mixture where the waste content was 100%, in which all criteria for application in subbase and subgrade reinforcement were met.