Estudo da influência da cal hidratada nas propriedades físicas e na compactação do solo

Abstract

Considering the frequent demand for improvements in soil characteristics, the influence of hydrated lime addition on its physical properties was analyzed, with the soil in natura as a reference. For this, dosages were made with 0%, 3%, 6%, 9% and 12% of hydrated lime. In this way, liquidity limit, plasticity limit, specific gravity of the solids, sedimentation, sieving, compaction and expansion tests were carried out. Still, it is worth mentioning that the classification parameters were performed by ABNT and AASHTO, in order to obtain a greater applicability. It was noticed that, with hydrated lime increases, there was an increase in plasticity limits and a reduction in liquidity limits. Nevertheless, the plasticity index ranged from 20 to 2 throughout the dosages. In addition, there was a gain in the specific weight of the solids and, in the compaction test, there was a gradual reduction of the maximum dry specific weight, as well as an increase in the optimal moisture, according to the addition of the hydrated lime fraction applied. Also, for being a predominantly fine soil, it was evaluated that, according to the AASHTO criteria, can not be used for the application in subgrades. However, with regard to the expansion, the soil was favorable, since it presented rates lower than 1%, and with a 3% increase in hydrated lime, it was already possible to inhibit its expansion.