Solo estabilizado com cinza do bagaço da cana de açúcar álcali-ativada na pavimentação.

Abstract

On highways, the soil is used as a support material and makes up the base layers, sub-base, subgrade reinforcement and the pavement foundation, and must present characteristics that provide stability and mechanical resistance when subjected to the stresses of traffic during its construction. lifespan. Soil stabilization is one of the most applied techniques when it comes to soil improvement in geotechnical engineering. Materials such as fly ash, blast furnace slag, rice husk ash, among others, have already been studied as a way to replace the materials used in paving. Sugarcane Bagasse Ash (SABC), due to its great pozzolanic potential, can be used to partially replace Portland cement. There are few studies that evaluate how CBCA behaves in systems with low levels of calcium and its use as a material for use in paving. Therefore, this research evaluated the influence of the content of CBCA alkali activated with sodium hydroxide (NaOH) on the mechanical resistance of a soil stabilized with these materials. The soil used in this research was quartz sand (commercial sand), which was stabilized with levels of 10%, 20% and 30% of CBCA alkali activated with sodium hydroxide (NaOH) at a molar concentration of 6mol. The mechanical tests performed were simple compression, freeze and thaw cycles, resilience modulus and California support index. Based on the results obtained, it can be inferred that the association of alkali-activated CBCA to the soil provided an improvement in the mechanical properties in terms of 340% in the resilience modulus and a 9-fold increase in the value for the support index California compared to the pure soil. Through the tests, it was verified that the waste promoted resistance gains as the CBCA content was added, reaching RCS values of 2.9 MPa, for the 30% CBCA content at 28 days of curing. For the freeze and thaw cycles, values of the order of 8.0MPa were obtained for the mixture of 30% CBCA at the end of the cycle. In general, the association of activated alkali CBCA, studied in this research, proved to be effective in stabilizing the studied soil, making the technique efficient for use in layers of road pavements.