Contribuição ao estudo da durabilidade de blocos de concreto produzidos com a utilização de entulho da construção civil.

Abstract

The accelerated process of industrialization and modernization has contributed to a significant increase in the generation of urban solid residue and causing social and economics damages. Beside the environmental problems, the shortage of raw materials can cause concern about the future. This problematic is request the attention of the experts in the way to add value to the re-use of the generated residue from the industrialization process. The trash volume, that is a great source of residue from civil construction, is almost two times the urban solid volume. Therefore, it is necessary to estimate the behavior of the alternative products made with these residues in relation to the conditions acceptable by society. This estimation is the aim of this work that deal with the use of the civil construction residue to make concrete building block. It was studied an accelerated weathering (wetting/drying cycles) as a methodology to evaluate the durability of the alternative composite. The results show that the increase in the residue content can increase the ratio water/cement due to the presence of materials with high water absorption, such as milled mortar and ceramic materials. The mechanical behavior of the alternative concrete indicate that the ideal composition to the alternative structural blocks is to the proportion 1:6 (cement/sand) and 1:8 to the no structural blocks, both with 60% of residues. In relation to the durability, it can be stated that the combination between the small consumption of cement (proportion 1:8) and 30% of residue substituting the natural aggregates can reduce the degradation effects of wetting/drying cycles. This composition is the best sample that stress the pozzolanic effect give by the presence of ceramic material in the milled residue.