Estabilização de dois solos do Rio Grande do Sul com Lignosulfonato de cálcio para fins rodoviários.

Abstract

The following work deals with an experimental study that aims to evaluate the influence of the organic additive Borresperse ® CA 45, a calcium lignosulphonate, in the mechanical properties at different curing times, of two soils whose the deposits are located in Cruzeiro do Sul - RS and Cachoeira do Sul - RS, that are being called Soil a and Soil B, respectively, for easy identification. The experiments performed in the laboratory include characterization physical tests (liquid limit, plastic limit and particle size analysis), and mechanical (expansion and CBR) of the soil in its natural state and the simple compression test for the soil-additive mixtures with the body of proof 5 centimeters in diameter and 10 centimeters in height. The soil-additive mixtures were tested at dosages of 1.5 % (1.5 g additive per 100 g of dry soil), 3% and 6%. Specimens of pure soil were also tested. The specimens of pure soil were molded at optimum moisture. Have the samples of soil-additive mixtures were molded by reducing the content of unit 5 % for each 1 % additive added, since it was observed the increased the plasticity of the soil. The specimens were subjected to curing times of 7, 14 and 28 days in a humid chamber, and then getting ruptured, obtained its resistance to simple compression. The results show that there was a significant increase in compressive strength of the Soil A, which showed very clear results, and Soil B, which showed results a bit scattered. This dispersion may be due to an error in the molding or even need to have set a longer cure, and the cure time a starting point for future work with the same product.