RESUMO.Com o aumento da população nos últimos anos, a indústria de modo geral tem se adequado à demanda resultante. A indústria do processo de recauchutagem de pneus gera resíduos que em sua maioria têm sido descartados sem nenhum controle. Este fato contribui para aumentar a poluição ambiental e favorecer a proliferação de vetores nocivos à saúde. Visando encontrar uma aplicação para esse tipo de resíduo, neste trabalho serão apresentados resultados experimentais de blocos intertravados para pavimentos de concreto, com traços adicionados de resíduos de pneus. Foram confeccionados blocos intertravados em que se determinou, por meio de ensaios laboratoriais, a necessidade de se fixar o traço que desse maior retorno quanto às características analisadas. Verificaram-se quatro tipos de traços de concreto com resíduos de pneus. Procedeu-se aos ensaios de resistência mecânica à compressão, absorção de água e resistência ao impacto. Pelos resultados preliminares obtidos, verificou-se que são satisfatórios, confirmando-se a possibilidade de aplicação desse tipo de bloco intertravado em ambientes com solicitações baixas, o que traria, além da economia das fontes naturais de agregados, benefícios ecológicos pela reutilização dos resíduos da recauchutagem de pneus.Palavras-chave: resíduos de pneus, blocos intertravados, concreto, material alternativo.ABSTRACT. Analysis of experimental interlocking blocks of concrete with addition of residues of process the tires retreading production. With the population growth in recent years, industry in general has ajusted itself to resulting demand. the industry of tire retreading generates residues that have been discarded without any control. this adds to environmental pollution and promotes the proliferation of vectors harmful to health. aiming to find an application for this type of residues, this study presents experimental results to interlocking concrete block pavements, with addition of residues tires. interlocking blocks were built up and we determined, through laboratory tests, the need to set the mark that provide greater return regarding analyzed characteristics. there are four types of dosage of concrete with residues tires. We accomplished tests of compression strength, water absorption and resistance to impact. Through the preliminary results, we verified that are satisfactory, confirming the possibility of applying this type of interlocking block in environments with low demand, which would bring the economy of natural sources of aggregates, beyond ecological benefits through the reuse of residues from retreading of tires.

No abstract

No abstract

This research intends to link thermal comfort as an important part of achieving energy efficiency in the operational phase of a building with the use of wood as a low embodied energy and carbon efficient construction material. The thermal performance of a representative multi-story social housing unit with common construction materials is evaluated in contrast to wood-based construction systems in Brazil. A project located in São Carlos, Brazil was selected. The construction system for walls consists of concrete blocks while roofs are composed of a fiber cement sheet and a concrete slab ceiling. As alternative wood-based wall systems, plywood panels with an air chamber or three different insulation materials (expanded polystyrene, cellulose and mineralized wood fiber) were tested while two alternative roof systems were analyzed (plywood lining with air chamber or insulation material). The project with common construction materials as well as the wood-based alternatives were evaluated through the Brazilian standard NBR 15575 and the European Standard ISO 13786. Furthermore, a transient simulation was conducted following the procedure established by NBR 15575 and using the adaptive comfort model ASHRAE 55-2013. The analysis evidenced the neglection of the recommended passive design strategies according to the Brazilian Standard 15220 and the psychometric chart of Givoni. In regard to the wood-based constructions, results showed that insulation of mineralized wood fiber in panels performed better than cellulose and expanded polystyrene. The transient simulation also demonstrated better thermal comfort conditions with a hybrid wood-based model compared to the construction typology of the representative project.