Análise das propriedades mecânicas de um concreto permeável fabricado em laboratório produzido com resíduos de construção e demolição (RCD)

Abstract

With urban growth it has intensified the impermeable areas thus providing large volumes of surface runoff, which can lead to flooding and flooding. Permeable pavements appear as a good practice in rainwater management. Accelerated growth also brings a need for a sustainable alternative for the disposal of waste generated by construction. In this research was made a permeable concrete and as there is a search for alternative materials, due to the scarcity of materials found in nature, in this work was used RCD as an aggregate, thus collaborating with the destination for these wastes. An analysis of the properties of this permeable concrete was carried out. The characterization of the RA was performed, obtaining values of specific mass, unit mass, volume of voids and percentage of water absorption. It was verified that RAs have a great capacity of absorption when compared to AN. The concrete was made with two distinct traces, one with 100% RA and the other with 50% AN and 50% RA, including 5% fines. After molding of test specimens and curing process, these specimens were disrupted at 7 and 14 days, respectively, for CP-AR 2.482Mpa and 0.120Mpa, whereas for the CP-MIS, 3.165MPa were obtained. 4.160MPa. This result of compressive strength can be attributed to the great variability of the RCD composition used in the manufacturing of the recycled aggregate. Another factor is the great porosity of the permeable concrete, the resistance of this type of concrete is inferior when compared with the conventional concrete. In general, the tendency is to decrease the fine aggregates, thus increasing the porosity of the permeable concrete, aiming to increase the permeability and as a consequence the decrease of the resistance. Finally, it is emphasized that the permeable concrete has important purpose for the environment, being an alternative that generates social and environmental benefits, being a sustainable solution and substitute to other solutions of the market. It is recommended the use of permeable concrete in light traffic pavements, and in order to increase the resistance of the concrete is indicated to make mixtures between natural aggregate and recycled aggregate, there is still the alternative of using additives.