Influência do Resíduo Proveniente do Corte de Rochas Ornamentais Mármores e Granitos (RCMG) como substituição parcial ao cimento portland nas Propriedades de Concretos Convencionais.

Abstract

Most of the industrial processes are sources of waste, in the form of gases, liquids or solids, causing, almost always, environmental degradation. The use of waste and industrial byproducts in Civil Construction is an excellent alternative to reduce the environmental impact caused, and greater contribution to sustainable development, considering that Civil Construction is the sector of technological activity that consumes a large volume of natural resources and appears to be one of the most suitable for absorbing solid waste. The residue generated from the processing of rocks (cutting residue of marbles and granites) is the result of the sawing process of blocks of rocks in slabs. In the sawdust, about 20% to 30% of the block is transformed into powder, which in most cases is deposited in corporate yards. In 2008, world rock production totaled about 105 million tons and in Brazil, 7.8 million tons were produced. Of this amount, five million were distributed among marbles, travertines, granites and the like, equivalent to 63% of the total Brazilian production, generating approximately 1.25 million tons of tailings resulting from this processing, that is, 25% marble, and, being the Holy Spirit, Bahia, Ceará and Paraíba the states that generate the greatest volume. In this work the physical, chemical and mineralogical characterization of the marble and granite cutting residue (RCMG) was carried out, as well as the potential evaluation as pozzolanic material. It was also carried out the feasibility of its use in concretes, with partial substitution in contents of 5%, 10% and 15% in relation to the mass of cement. For the concretes produced, the properties of the concrete in the fresh state (workability, consistency) in the hardened state (axial compressive strength, diametral compression tensile strength and flexural tensile strength and modulus of elasticity) were evaluated and durability parameters (absorption by capillary absorption by immersion). The analysis of the results allows to conclude that the cutting residue of marble and graniteVIII presented satisfactory results and has potential to be used within the productive chain of the civil construction.