Avaliação do efeito da adição de resíduo de ardósia no módulo de resiliência de misturas com solo argiloso

The extraction of slate generates large volumes of waste that could be applied in paving. The dynamic Resilient Modulus (RM) test provides important data for the structural analysis of pavements. Although several studies have been carried out to evaluate RM for pavement applications, few refer to the analysis of the effects of the percentage increase of wastes in mixtures. In this paper, it was possible to verify, through physical-mechanical characterization and MR tests of mixtures with clayey soil containing percentages (60, 70 and 80% by mass) of slate waste (SLT) and aggregate of gneiss (REF), which there is similar physical behavior of the SLT and REF mixtures. It was observed that the California Bearing Ratio (CBR) and MR values of the SLT increased by 16.1% and 40.9%, respectively, with the addition of the slate waste between SLT 60/40 and SLT 80/20. The MR results obtained are within the range reported in the bibliographic references for recycled and natural materials used in paving. Finally, the software MeDiNa was used to prove the possibility of using SLT mixtures as base and subbase paving layer. Thus, it is important to develop studies that allow a better analysis of the applicability of waste as a substitute for conventional paving materials.