Análise do comportamento mecânico de misturas solo-cinza e solo-cinza-cal para camadas de pavimento

Abstract

Bernuccie et al (2007) synthesizes pavement as a multiple layer structure with defined thicknesses built onto a final sub-grade, destined technically and economically to resist the loads originated from the traffic of vehicles and to weather effects, and to provide users the best conditions for driving with comfort, economy and safety. The region where this work was developed is devoid of quarries, what makes graduated gravel a common alternative for bases and sub-bases. Therefore, the mixture with various materials, including recycled ones, is a solution that should be studied and widespread. Of possible solutions, soil stabilized with fly ash and hydrated lime fits perfectly since it improves local soil’s mechanical features and creates usage for fly ash, which is a residual waste generated by local industries. This work compares the mechanical features of local soil, fly-ash-stabilized soil, lime-stabilized soil and fly-ash-lime-stabilized soil, in the proportions of 12% for ash and 4% for lime, evidencing the potentials of each alternative on layers of pavements. Starting with samples of silt soil and fly ash, industrial waste and hydrated lime, mixes were made and tested in laboratories, where, through physical and mechanical characterization tests, it was possible to determine the influence and behavior of the soil when blended with each chemical reagent and water. It was verified the lack of reactions when the featured soil was blended with fly ash or lime separately, but the occurrence of stabilization when mixed with fly ash and lime combined. The compressive and tensile strengths of the mix grew with time in relation to natural soil, representing a viable alternative for stabilizing different pavement layers