Caracterização geotécnica de solo estabilizado com cimento e cinzas de resíduos sólidos da saúde

Abstract

This work presents the analysis of the physicochemical, mineralogical and mechanical behavior of a soil stabilized with Portland cement and ash from Solid Health Waste (SHW). From this, the technical feasibility of using this compound in layers of road pavements was investigated. A sandy soil, ordinary Portland cement with addition of blast furnace slag (CP II -E) and SWH ash were used. The methodology involved the execution of soil geotechnical characterization tests and the mechanical behavior of soil-cement and soil-cement-ash mixtures. Compaction tests were carried out on specimens molded with pure soil and soil-cement in normal, intermediate and modified energies with cement contents added of 0%, 3%, 6% and 9%, in order to determine the cement content ideal. The soil-cement mix that presented the best result was with the addition of 9% of cement in relation to the soil mass, using the modified energy, there was an increase in resistance of 8.95% in relation to the initial one. The CBR test was carried out in pure soil, at normal energy and with humidity above 5.94%, the minimum values of CBR required for sub-base were reached, however, the values required for use in bases were not reached. of floors. Simple compression tests were carried out and, with normal compaction energy and 9% cement content, the result of 25.31 kgf/cm² was found, which meets the minimum required for the use of soil-cement in pavements. This cement content was used for the compression tests with the soil-cement-gray, using 5%, 10% and 20% of ash to replace the soil and with normal energy, the values of 56.62 were obtained. kgf/cm², 38.43 kgf/cm² and 32.46 kgf/cm², respectively. In all traces with the addition of RSS ash, the values of the simple compressive strength obtained an increase. The incorporation of up to 20% of ash to the trace demonstrated that it is technically feasible to use RSS ash in the chemical stabilization of soilcement in sub-bases and pavement bases. Therefore, a solution is presented for adequate disposal of SWH ash, allowing the reduction of soil use in the trace and increase in resistant properties.