Utilização do resíduo da serragem de granito para uso em blocos de concreto sem função estrutural.

Abstract

The Brazilian industrialization of ornamental rocks has an important signification in the national scenery as well as in the international. This is due to the different types of marbles and granites and to the enormous potentiality of various Brazilian states in the production and mining of these rocks. As a consequence of the industrial process, it is generated a great amount of waste in the form of mud. The mud that is produced is usually constituted of water, iron oxide, whitewash and grounded rocks. This very polluted product is noxious to the man and normally is deposited in an inadequate way in the nature. With the objective of reducing the deleterious effects produced by these wastes, several research have been carried out in order to make an adequate use of them as well it has been studied an appropriate way for their disposal. This thesis, presents the results of an investigation that aimed to contribute to a solution for mud waste mentioned above. This solution implies a solid contribution to that process of environmental understanding and to the development of materials alternative employees in civil construction. In the latter, it was studied the possibility of introducing the mud waste of the granite sawdust in the fabrication of concrete blocks with non-structural function. In order to achieve the objectives outlined in the thesis, the mud waste from the granite sawdust was incorporated to the concrete mixture normally used to fabricate blocks in the proportions of 5%, 10%, 15% and 20% in relation to the total volume of the sand. This was done aiming to define the best amount that allows a larger use of the waste in the production of blocks. After the introduction of the waste, unconfined compressive strength (UCS) for the produced blocks was determined and the results obtained were compared with those from normal concrete mixture used to fabricate the blocks. Also the absorption of water by immersion on the blocks was measured and the obtained results were considered as technological and economical factors. It was obtained that the proportion of 1:8 (I cement: 8 attaches - sand - in volume) was the most interesting and advantageous for the accomplishment the objective of this thesis. The use of the mud waste from granite sawdust was shown highly viable, as the blocks produced with the incorporation of this material presented compatible results with those from standardization. Also it was obtained better (higher) values for UCS using alternative mixtures (which incorporated the mud waste from granite) compared with UCS values obtained using the blocks made with mixture in the conventional way.