Aproveitamento de resíduos da construção civil na produção de tijolos solo-cal.

Abstract

In Brazil there are serious environment problems regarding the indiscriminate extraction of natural resources and constant generation of construction and demolition waste. Researching solutions to minimize this degradation, new techniques for reusing and recycling of construction waste for the production of alternative materials have been developed, encouraging sustainable development. With the aim of obtaining pozzolonic binder from recycling of construction waste, for its application in the manufacture of soil-lime bricks, it was studied a sample of demolition waste, from the reform of Soil Laboratory I, a soil and a sample of lime. The samples were characterized by chemical analysis, thermogravimetric analysis, X-ray diffraction, surface area and determination of pozzolanic activity. The demolition waste was milled in mill climbs, until obtaining a particle size similar to the lime. Specimens were prepared for test-soil-lime and lime-soil-residue on the das and 1:10, as binders and lime waste from demolition, the following compositions: 0%, 10%, 20%, 30%, 40%, 50% and 75% waste and soil as aggregate. Then, they were made of soil-lime bricks incorporated with 25% waste, what is the best composition of the specimens used in evidence. The specimens and the bricks were cured for periods of 28, 60 and 90 days and tested for determine unconfined compressive strength and absorption, which showed that the recycling of waste demolition presented itself as a promising material to be used in the manufacture of bricks used in buildings and that its use implies the preservation of the environment and improving the quality of population lives in general. But it's necessary further study in relation to standardization. The results were not satisfactory with the demolition waste as a binder.