Utilização do resíduo de construção e demolição em solo compactado

Abstract

The construction industry is a major consumer of natural resources while also being responsible for generating a huge amount of solid waste. This is mainly due to losses that occur in the construction process and the lack of reuse and recycling of the material generated in the demolition process. According to Resolution 307 of the National Environment Council, generators of construction waste should have as a priority the non-generation of waste and, secondarily, reduction, reuse, recycling and final destination. Therefore, in this research the construction and demolition residue was combined with a clay soil compacted to constitute a new material that could be used as a foundation for surface foundations or as landfills for the construction of roads. Firstly, soil and residue characterization tests were performed and compaction tests were carried out with each material. Samples of 5.0 x 5.0 x 2.0 cm soil with addition of 0, 25, 50 and 75% of waste from construction and demolition was molded at optimal humidity and maximum density for the execution of the direct shear tests. From the direct shear tests it was possible to determine the resistance parameters and to know the tension behavior x horizontal displacement and vertical displacement x horizontal displacement of each material. Through the compaction tests, it was observed that the optimum humidity decreased and the specific weight increased with the addition of RCD. The resistance parameters obtained through the direct shear tests underwent changes with the addition of the residue, where the cohesion decreased and the friction angle increased. It was also contacted that the shear stress increased with the addition of 50% and 75% residue to the normal stress of 400 kPa. On the other hand, for the other normal stresses and for the different residue contents there were no significant changes in the shear tensions. As for simple compression, this showed that the soil-residue mixture is efficient for mixtures of 25% and 50% if compared to the soil without addition of residue.