Análise da compressibilidade de um solo estabilizado granulometricamente com cinzas têxteis

Abstract

The granulometric stabilization of granular soils with ashes derived from industrial waste is a widely adopted practice, as these residues contain a significant amount of fine particles, contributing to the reduction of void volume and deformability. Textile industry ashes, when used for granulometric soil stabilization, provide a more sustainable and environmentally safe disposal alternative. However, despite its advantages, the use of textile ashes in soil stabilization must be carefully evaluated due to their complex composition. Thus, the objective of this study was to analyze the effect of adding ashes from textile waste on the compressibility of a sandy soil, aiming to assess the feasibility of this material as a granulometric stabilizer. The materials analyzed in this research included sandy soil, textile ash, and a soil-ash mixture. The soil sample was collected from a rural road, while the textile ash was obtained from a red ceramic factory located in the municipality of Russas, Ceará, Brazil. The samples were sent to UFC – Russas Campus, where they underwent geotechnical, mechanical, and chemical characterization. Additionally, an analysis of the mechanical behavior of textile ash was conducted through compaction tests, and compressibility analysis was performed using oedometer compression tests. To obtain the soil-ash mixture, the optimization of particle arrangement was sought by minimizing the void volume, using the Andreasen packing model. The oedometer test was conducted under loads of 6.25, 12.5, 25, 100, 200, 400, 800, and 1600 kPa, with deformed and compacted samples at the optimal point of the compaction curve, considering Normal Proctor energy. During the test, complete loading and unloading of the samples were carried out. The results obtained for the consolidation coefficient were 8,893 × 10ି଻𝑚²/𝑠 the soil, 8,774 × 10ି଻𝑚²/𝑠 for the textile ash, and 8,421 × 10ି଻𝑚²/ for the mixture. These values indicate that the addition of ashes to the soil does not significantly increase the consolidation rate, nor does it substantially alter the soil's hydraulic behavior and deformability. Therefore, the ash acts primarily as a granulometric stabilizer.