Avaliação da substituição do cimento Portland por cinza de casca de arroz (CCA) em solos melhorados para utilização em camadas de base de pavimentos

Abstract

In the early 1940s, Brazil witnessed a significant industrialization process driven by the decline of railway transport and the growth of the automotive industry. Road networks became crucial for national transportation, handling over 60% of freight and 90% of passenger traffic. However, the inadequate condition of these highways underscores the urgent need for effective and sustainable solutions for their maintenance, aiming to preserve natural resources and minimize environmental impacts. This study evaluated the performance of soils stabilized with CCA for use in pavement base layers, comparing them to soils stabilized with Portland cement under equivalent dosages and conditions. The methodology adhered to the empirical method specified in DNIT 142/2022-ES, with results analyzed against regulatory limits. Findings indicated that incorporating both cement and CCA as soil stabilizers significantly impacted the investigated geotechnical properties. Cement enhanced soil mechanical strength by increasing cohesion and compression resistance. Conversely, CCA-treated soils showed higher liquid and plastic limits but reduced soil expansion. Long-term field studies are recommended to validate the sustainability and efficacy of these materials in real-world applications, accounting for climatic and loading variables.