ANÁLISE DA ESTABILIZAÇÃO DE SOLO ARGILOSO COM RESÍDUOS DE CONSTRUÇÃO CIVIL (RCC) PARA APLICAÇÃO EM BASE E SUB-BASE DE PAVIMENTOS

Abstract

Highways represent the main mode of transportation in Brazil, playing a fundamental role in national logistics, while also requiring significant investments in maintenance and structural quality. The construction of durable pavements demands not only proper techniques but also quality materials, which poses a challenge in regions dominated by clayey soils, known for their low mechanical strength and high expansibility. In this context, the local soils stabilization emerges as a sustainable alternative, aiming to reduce the impacts of quarry extraction and transportation costs. Among the techniques employed, the use of construction and demolition waste (CDW) stands out, as it represents a technically viable solution while also contributing to the mitigation of environmental impacts related to improper disposal. This study aims to evaluate the effectiveness of stabilizing a clayey soil from Rio Verde-GO with the CDW addition in proportions of 25%, 50%, and 75%, targeting its application in pavement bases and sub-bases. The research seeks to understand how different percentages of CDW affect the soil’s gradation, liquid and plastic limits, compaction, and CBR, to identify the ideal proportion of CDW to improve its mechanical properties. The results indicated that adding CDW to the clayey soil significantly improved its physical and mechanical properties. The mixtures met the CBR and expansion criteria for sub-base use, and in the case of 75% CDW, also met the gradation required for base layers. However, the Los Angeles abrasion test was not performed, which limits the completeness of the evaluation. Nonetheless, stabilization with CDW proved to be both technically and environmentally viable.