Influência do "dopping" de silicato de sódio e hidróxido de sódio no sistema solo-cal aplicados a solos vermelhos tropicais.

Abstract

This paper presents a study developed with ten tropical red soils from northeastern Brazil, aiming to analyze the influence of silicate secondary additives. sodium hydroxide at different concentrations and cure times as well as to analyze the mechanism of action of these secondary additives in the tropical red-lime soil system. Tropical red soils were evaluated by determining the simple compressive strength (RCS) with 6% of lime by mass, and soon after the addition of secondary additives sodium hydroxide and silicate in the proportions of 0.5%, 1.0%, 1.5%, 2.0%, 2.5% and 4.0% to the specimens used separately, cured for 7, 28 and 60 days was a humid chamber with 100% relative humidity at a temperature of 22 ° C + - 2 ° C. Analyzing the results from RCS-cal + values For sodium compounds (sodium hydroxide and silicate), there was a gradual increase in the RCS value in the soils studied at different concentrations and curing times, as well as a benefit in the mechanical properties of the Red soil system. tropical-lime. It was also found that the variation of RCS as a function of additives was nonlinear, the secondary additive sodium silicate was much more effective than sodium hydroxide. From the statistical studies performed in the form of simple linear correlations, good results were obtained in the simple linear correlations between the RCS of lime soils and sodium compounds (silicate and sodium hydroxide) in relation to the percentage of kaolinite alone and in relation to the percentage. kaolinite plus amorphous materials. These studies showed the efficiency of silicate and sodium hydroxide secondary additives in soil stabilization.