Estudo da resistência ao cisalhamento de misturas de solo argiloso com resíduo de borracha de pneus

Abstract

In some cases, the soil in its natural condition does not meet the geotechnical properties necessary for the development of a safe engineering work. The use of ground rubber for soil reinforcement is presented as a possible alternative to enable geotechnical works in low resistance soils. In this context, this project proposes the execution of shear resistance test of mixtures of residual basaltic clay soil with rubber tire residue, in order to verify the viability of its use as soil reinforcement. The soil sample was collected at the UFFS Campus Chapecó - Experimental Site. The rubber residue used in this study is coming from retread company from the west of Santa Catarina, and it is composed of particles with an effective diameter of 0.3 mm. The rubber residue concentrations adopted were 0 (pure soil), 5%, 10%, 15% and 20%. The specimens were compacted in a way to achieve the optimum water content and the maximum dry density, and the normal stresses adopted in the direct shear tests were 50, 100, 200 and 300 kPa. The mixtures presented, in general , a greater angle of internal friction and less cohesion, if they are compared to the pure soil. The rubber content with the best performance was close to 10%. Although soil rubber mixtures presents less resistance than pure soil, they still have resistance characteristics that can supply the demands of engineering projects.