Influência das energias térmica e mecânica em propriedades de engenharia selecionadas de alguns solos lateríticos do Norte e Nordeste do Brasil.

Abstract

This dissertation presents the study of the influence of thermal and mechanical energies on the elastic and shear strength properties of some lateritic soils of northern and northeastern Brazil. In addition, it presents a study on the influence of thermal energy on some selected chemical and engineering properties and an evaluation of the methodology for the direct shear test. The results allowed to conclude that the modulus of elasticity, the cohesion and the internal friction angle (o i, i = 1 and 2) tended to increase with the increase of the mechanical energy of compaction. Regarding the effect of thermal energy on the properties of the studied soils it was observed that the increase of the drying temperature affected the modulus of elasticity, without defining a tendency. Increasing the drying temperature tended to decrease cohesion and increase the friction angle of the soil. This behavior, however, tended for some soils to invert to the internal friction angle (o 1) in the dry branch of the compaction curve. The obtained results also showed that the increase of the drying temperature caused an increase in the content of acid cations and soluble salts and a reduction in the content of alkaline cations, pH and clay size fractions. Soil plasticity limits were not affected by the drying temperature increase, however, the liquidity limits decreased with this increase. Regarding the direct shear test methodology, including the molding of the specimens, it was observed that it was satisfactory.