Aplicação dos resíduos sólidos da construção civil em pavimentação

Abstract

The construction industry stands out as one of the main generators of municipal solid waste, demanding technical and scientific approaches focused on the efficient and sustainable management of these materials, in accordance with the principles of the National Solid Waste Policy (PNRS). Among these materials, Construction and Demolition Waste (CDW), predominantly classified as inert (Class A, according to CONAMA Resolution No. 307/2002), presents significant potential for reuse, particularly in the production of recycled aggregates for geotechnical and pavement engineering. The composition of CDW is heterogeneous and depends on variables such as the type of building, the stage of construction, the construction techniques employed, and regional urbanization patterns, which directly influence the physical and mechanical properties of the recycled aggregates.In this context, the present research aims to evaluate the geotechnical behavior of recycled aggregates from CDW originating from the demolitions in the Mutange, Pinheiro, and Bebedouro neighborhoods, in the municipality of Maceió/AL. These regions were impacted by land subsidence resulting from salt rock mining in underground mines, according to the diagnosis by the Geological Survey of Brazil (SGB/CPRM). The research proposes the physical and mechanical characterization of representative samples of this waste with a view to its application as subgrade reinforcement material in urban pavements.The methodology is based on standardized laboratory tests according to NBR 15.115/2004, encompassing grain size analysis (sieving and sedimentation), determination of consistency limits (liquid and plastic limits), shape index, Los Angeles abrasion, bulk specific gravity, compaction, and California Bearing Ratio (CBR). A sample composed of 100% recycled aggregate (RA) will be analyzed. It is expected that the recycled aggregates will exhibit technical performance compatible with standard specifications, enabling their use as an alternative input material in the paving of low-volume urban roads.The technical and environmental feasibility of reusing this waste, besides contributing to mitigating the impacts arising from the inadequate disposal of CDW, promotes the reduction of natural aggregate exploitation, savings in public resources, and the integration of circular economy principles into urban infrastructure. Therefore, this research intends to offer technical support for paving and sustainable civil engineering practices at the municipal and regional levels.