Estudos sobre a reatividade à cal de solos lateríticos, visando sua estabilização. Aplicação a um solo laterítico de Nova Floresta, Estado da Paraíba.

Abstract

This dissertation investigates the evolution of the behavior of a lateritic soil, when subjected to lime stabilization, with respect to changes in its engineering properties (mechanical properties and permeability characteristics), with different lime concentrations and submitted to different time periods. healing and water percolation. The tested samples were molded at concentrations of 0, 2, 4, 6 and 8 percent lime; 7, 14 and 28 days of cure and a constant pressure water percolation system for periods of 0, 3, 7, 14 and 28 days, after which they were submitted to the triaxial shear strength test, at the confining pressures of 1.0, 2.0 and 3.0 kgf / cm. The percolation process was analyzed for the behavior of the permeability parameters for the different lime concentrations and cure times as a function of time. The results clearly show that for the studied soil, the addition of lime in the different contents, regardless of the curing time, provided the soil-lime system, a higher permeability than the soil in its natural state, due to the phenomenon. flocculation induced by lime. The evolution of the resistance behavior was analyzed based on the results obtained through the triaxial tests (deviator x axial deformation). The results obtained for the lime - soil show that the lime content, cure time and percolation time did not have an evident influence on the resistance gain when compared to the soil without lime. that the lime strength for all contents was lower than that of pure soil, therefore, there is no Law of formation or logical sequence in the results obtained of triaxial shear strength, in terms of gain or not of strength. We tried to develop a comparative study between the results and conclusions obtained by us and those obtained by other scholars of the subject, trying to group and correlate these results, in terms of evaluation and activity of lime, of the lateritic soil under study, through processes and methods. mechanical, and those based on soil microstructure, analyzing their efficiency and ease of execution. A detailed interpretation of all these aspects and phenomena is presented in this paper.