Estudo da durabilidade de tijolos solo-cal incorporados com resíduos de demolição da construção civil.

Abstract

Besides being responsible for more than half of the generated urban solid residues, the construction industry is also considered the greatest natural resources consumer. The impacts caused by this industry have motivated researches that aim on developing new techniques for reuse and recycling of the construction residues for the production of alternative materials and promote sustainable development. Among the alternative materials, soil-lime brick has advantages such as simplicity of production, compression resistance similar to the conventional bricks, and not going over the cooking process. The introduction of construction debris to the soil-lime brick becomes feasible because of the possibility that such residues, when finely ground, exhibit cementing properties, which may replace part of the lime used in the material. Despite that, to assure confidence in the applications of these new materials it is crucial to assess its durability. This study aimed to evaluate the durability of soil-lime bricks embedded with demolition residues. Test specimens were prepared using mixes in a 1:10 ratio of limeisoil, and the residue used in partial replacement of lime in the proportions of 25%, 50% and 75% for curing periods of 28, 60 and 90 days. The materials were then applied to physical and mineralogical characterization through the following tests: particle size distribution by sieving, laser diffraction, chemical analysis, thermogravimetric analysis, thermal analysis and X-ray diffraction. The durability study was performed using the accelerated aging method by evaluating the compression strength of the tests specimens used, over the cycles of wetting and drying. The results showed that increasing the amount of residues in the soil-lime affect the durability, and percentages over 50% compromises the mechanical behavior. It was also found that the usage of moderate percentages may make possible to introduce the demolition residues into method of for construction purpose.