This research aimed to investigate the mechanical and physical properties of Roller Compacted Concrete (RCC) used with Recycled Concrete Aggregate (RCA) as a replacement for natural coarse aggregate. The maximum dry density method was adopted to prepare RCC mixtures with 200 kg/m³ of cement content and coarse natural aggregates in the concrete mixture. Four RCC mixtures were produced from different RCA incorporation ratios (0%, 5%, 15%, and 30%). The compaction test, compressive strength, splitting tensile strength, flexural tensile strength, and modulus of elasticity, porosity, density, and water absorption tests were performed to analyze the mechanical and physical properties of the mixtures. One-way Analysis of Variance (ANOVA) was used to identify the influences of RCA on RCC’s mechanical properties. As RCA increased in mixtures, some mechanical properties were observed to decrease, such as modulus of elasticity, but the same was not observed in the splitting tensile strength. All RCCs displayed compressive strength greater than 15.0 MPa at 28 days, splitting tensile strength above 1.9 MPa, flexural tensile strength above 2.9 MPa, and modulus of elasticity above 19.0 GPa. According to Brazilian standards, the RCA added to RCC could be used for base layers.
Dimensionamento de pavimentos semirrígidos: identificação de fatores influentes na deflexão máximaComposite pavement design: identification of factors influencing maximum deflection Diseño de pavimento semiflexible: identificación de factores que influyen en la deflexión máxima
Esta pesquisa apresenta uma análise dos resíduos sólidos de tintas e vernizes no município de Sobradinho/RS. Busca-se identificar destinações dos resíduos desses materiais construtivos que podem ser tomadas pelos geradores sem danos ao Meio Ambiente. Concomitantemente, busca-se apresentar os riscos característicos do descarte incoerente desses resíduos, com intuito de conscientizar os geradores a não destinar seus resíduos de tintas ou embalagens a meios de reciclagem de forma divergente àquela esperada pela manutenção de um bom contexto ambiental. Para composição do panorama desses resíduos no município, foi realizada uma pesquisa bibliográfica com intuito de conceituar o tema e uma pesquisa de levantamento de dados nas lojas que vendem tintas e vernizes em Sobradinho, com intuito de aferir o quanto que os colaboradores desses estabelecimentos sabem informar seus clientes a respeito da periculosidade de tintas e vernizes ao Meio Ambiente.
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