Incorporação de resíduos da indústria de calçados (EVA - etileno vinil acetato) em tijolos prensados de terra crua.

Abstract

Concerning shoes export, Paraíba state is in the fifth place in Brazil. Some of these industries use a type of polymeric EVA (Etilene vinyl acetate) that generate many waste that causes problems to environment. Two types of residues are present: in form of plates and as a powder. A way to liberate the environment of that inconvenient material is its incorporation in compressed earth blocks as shown in this work. The characterization of the materiais was made. Several mixtures soil-EVA were tested, with the percentage of residues varying from 0 to 50% in relation to the soil volume. To employ of the residue, that comes in form of plates a mill was used to produce particles smaller than 2,4 mm. In the case of the powdered residue, none transformation process was needed. As stabilizer, cement was used in rates of 6, 8 and ^ 10% by weight of soil. Compression strength of the mixtures was obtained in the bricks, ^ fabricated in a small manual press. With some of these mixtures bricks were manufactured £o and four paneis with about lm2 were built. They were instrumented with 5 strain gages and a ™ compression test was made. Two others walls, one with incorporation of EVA and another £j without, were prepared for thermal performance. Results show that increasing the amount of ^ EVA strength of the bricks drops sensibly. More than 10% of EVA incorporation are not adequate. The walls performed well, even if the press with doesn't get great compactation on the soil and consequently the resistances were not high. They can be used for non-structural walls. In the thermal point of view, it is shown that the incorporation of 10% of rubber drove to a decrease of approximately 5 °C in relation to a wall made with bricks without EVA, exposed to the same boundary conditions.