This research studies the mechanical behaviour of mortars with the addition of increasing percentages of rubber from used tires. This type of mortaris usually destined to wall coating and components, in which case it should present the required properties. In this study natural sand has been partially substituted by fine aggregate from recycled rubber and the hard state properties have been evaluated. The results obtained indicate the technical viability of the substitution. With the use of recycled aggregate the quality of the mortars has been preserved, which shows the possibility to properly adequate the destination of discharged rubber aiming to minimize environmental impacts and to reduce natural sand extraction from non renewable sources.
Waste residues derived from the breaking process of rocks have been many times inadequately discarded on the environment generating an environmental passive. The residues could be used in the production of self-compacting concrete (CAA) providing more sustainable constructions. To study different CAA mixtures the following tests have been performed in the fresh state: Water Absorption, L - Box, V - Funnel and Slump Flow Test. For the evaluation of mechanical performance, the concrete Compression Strength Test, Flexural Strength Test and Tensile Strength by Diametric Compression Test have been performed in the hard state. Technical and environmental viability in the addition of this type of residue for the studied percentages have been verified.
Resumo AbstractO Brasil é considerado um laboratório riquíssimo de solos e clima tipicamente tropicais de grande importância para a geotecnia e a infra-estrutura de The production of waste by tire industry has been a growing problem, indicating the need for research to find out new ways for its reuse. This study deals with the evaluation of the mechanical properties of modified concrete with the addition of rubber fibers provided from tire crushing to be used in roadway pavements. Different concrete traces were produced, within which part of the fine aggregates were substituted by tire rubber in 10%, 20%, 30% and 40% in mass. Material characterization and mechanical experiment testing were performed, which show that, due to the great resistance loss and operational difficulties, the addition of tire rubber in concrete for pavements is not recommended. Palavras-chave:reaproveitamento, resíduos, borracha de pneus, pavimentação, concreto, propriedades mecânicas.
The production of waste by the tire industry has been a growing problem, indicating the need for its reuse. More than thirty million tires are discharged per year in Brazil, where regulation for the environment states that for each four new tires, five unusable ones must be adequately disposed by manufacturers and importers. Paving consumes an extremely large quantity of materials, which can be the source of rational application of waste and rejected materials. Research shows that tire rubber can be added to asphalt, which increases its durability and improves pavement quality and safety conditions by absorbing the rubber elastic properties, and also be used for architectural applications, among others. This study deals with the addition of rubber fibers from tire crushing in concrete for roadway pavements in order to provide proper indication about the alternative material disposal through an evaluation of the mechanical behavior of the modified concrete. Different concrete mixes were produced, within which, part of fine aggregates were substituted by tire rubber and mechanical experiment tests were performed, which show that, due to great resistance losses, the disposal of this alternative material in concrete should be considered for light traffic pavements, with the addition of rubber ranging up to 10% in mass
This study aims to assess the potential for wind power generation in the town of Caraguatatuba-Sao Paulo North Coast-Brazil. The statistical analysis of wind speed will contribute to this evaluation. Data of wind speed from 2004 to 2013, corresponding to the meteorological station Caraguatatuba (code 32521) Sinda/INPE system were used. Weibull distributions for the four seasons were analyzed, and their shape and scale parameters for the wind speed data, from which an extrapolation of the vertical profile of the wind to height of 100m was performed. It was found that the average power of the wind speed is favorable to the installation of wind turbines in all seasons.
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