Utilização dos resíduos da serragem de granitos na produção de tijolos sílica-cal para uso em construção civil.

Abstract

Nowadays, Brazil has some hundreds types of different marbles and granites. The processing of granite rocks blocks to obtain ornamental rocks produce a great amoint of wastes in form of mud, generally constituted of water, lime, iron oxide and grounded rocks. Under adjusted conditions, these materials can be reused, decreasing in this way, the consumption of the natural resources and the necessity of treatment to disposal or elimination of the wastes, and so, there is the decreasing of the produced risks, and can also give utility to a material, nowadays without economic value. It is really important to change the concepts and the implantation of politics that can conciliate the rational exploitation of the natural resources, with the development of new technologies. Preliminary studies, looking for the utilization of these of wastes, can confirm, in a satisfactory way the use of these products in the industries of sand lime bricks. Sand lime bricks are construction materials obtained by mixtures of sand, small portions of lime and sufficient water to form bricks by pressing and cured in an autoclave. This work is based on the use of granite sawing wastes in the production of sand lime brick to use in civil construction. Characterizing tests was conducted: particle size distribution, chemical analysis, distinguishing thermal analysis, gravimetrical thermal analysis and x-ray diffraction, and physical-mechanical determinations according to ABNT. In the diverse compositions (wastes-sand) and using wharf calciticas and dolomíticas, was observed that in the samples with hidróxido of calcium Ca(OH)2 the mechanical resistências were superior. Pointing out the substantial growth of the resistance to the other used wharves, to the measure that, magnified the period of cure. The results corfirm that is possible to use the granite wastes with sands in the production of sand lime bricks.