Utilização de agregados reciclados de resíduos da construção civil em camadas de pavimentos de tráfego leve: estudo de caso no município de Americana

Abstract

Construction activities have, as a consequence, the production of by product. It represents several problems in the management of cities both by the large volume produced, as by its improper disposal. Nowadays, this construction and demolition waste has aroused interest as a source of recycled material for the own construction, such as inputs of urban pavements, which provides environmental and economic advantages for the cities. This dissertation analyses the economic and technical viability of the use of recycled aggregates from construction waste mixed in layers of base and sub-base light traffic pavements that were generated in the region of Americana in the state of São Paulo. The research involves laboratory tests, typical pavement dimensioning taking into account the use of conventional and recycled materials and the presentation of estimated values for the execution of structures that were obtained from the use of those materials. The physical and mechanical properties of the recycled aggregates were determined by means of laboratory tests: characterization of the constituents of recycled aggregates, percentage of unwanted materials, particle size analysis, shape index, compaction, California Bearing Ratio and resilient modulus. Based on the outcomes of the studied CBR materials and the pattern of conventional simple graded crushed rock, it was designed pavement structures to assess the technical and economic viability. The outcomes show that when the recycled materials are submitted to an appropriated compression, they act just like a simple graded crushed rock. It was found similarity in the sized structures with two kinds of aggregates. The final cost of the implementation in one of the proposed pavements was 47% less than with the use of recycled, despite the structure designed with this material have showed larger thicknesses.