Análise do efeito da compactação – energia modificada - em um solo com adição de cal e cimento

Abstract

Soils are materials that present a great diversity, even in the near regions, because they come from the deterioration of rocks. Engineering, soils are the clusters of particles from the decomposition of rock, much more the building material and / or support for structures. For this reason, this material is submitted to experimentation, with the purpose of knowing its characteristics to adjust it to the needs of the engineering, through its improvement. Because it is a more economical and environmentally friendly solution, process stabilization is more commonly used for soil improvement. Soil stabilization can be reversed through mechanic, physical and chemical, the latter being commonly performed with cement and lime. The research aims to evaluate the compaction with modified energy in a clay-silt soil, of Guabirotuba formation, through the addition of calcium and lime, comparing it with the results obtained by Sales et al. (2017) through the compaction of this same soil with normal energy and the results obtained by Cavarsan (2018) through the compaction, also of the same soil, with intermediate energy. For this analysis, the contents of 3%, 5%, 7% and 9% of the chemical additives in the soil were selected using the same methods of Sales et al. (2017). The modified Proctor compaction test was carried out, yielding a maximum specific dry weight of 1,70 g/cm³ and an optimum moisture content of 15% for natural soil, 18% for a soil-lime mixture and 20% for a soil-cement blend. From these results, specimens were molded with the defined contents and subjected to the simple compression test after 28 days. Comparing the results with those obtained by Sales et al. (2017) and Cavarsan (2018), we notice a modified energy compaction of this type of soil, both natural and with an addition of energy, that generates greater resistance to simple compression than a compaction with the other two types of energy, but the same is not done for a soil-cement mix. It was also realized the CBR, noting for a modeling with the modified energy, the soil expansion was greater to the compaction with normal energy, besides presenting less support of the soil. A cost analysis was also performed, concluding a mixture of 3% of soil, with a modified energy, is more economically feasible.