Planejamento experimental e otimização de processos na definição de traço de concreto com resíduos para produção de tijolos

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Universidade Federal de Goiás


The volume of solid waste produced is increasing disorderly and harmful to nature, since they are not given him proper purposes. As waste that can be used in the manufacture of concrete bricks is the waste tire rubber, which is a major cause of environmental problems, and the cementitious waste generated in concrete plants, called Concrete Sludge Waste (CSW). The overall objective of this study will then be to determine a concrete trait for brick production, containing the highest percentages of concrete sludge waste and tire rubber granulate together. To do so, the applicability of the residues was analyzed separately in Studies 1 and 2, and later jointly in Study 3, that the Central Composite Delineation of Rotational was used as experimental planning and the data evaluated through Response Surface Methodology, and Study 4, being the waste tire rubber granulate replacing the aggregate and the Concrete Sludge Waste in its dry state (CSW-S) to the cement. The physical-chemical characterization of the aggregates and the test of resistance to compression and water absorption of the bricks were performed. The results showed that it is feasible to use CSW-S and waste tire rubber granulate, but the higher the rubber percentage, the lower the compressive strength and the higher the water absorption, the rubber substitution limit is dependent on the aggregate used and the molding conditions, as well as the trace used. However, the CSW-S did not present significant effects when compared to those of the rubber, thus, replacements of higher percentages could be made. There is then an optimal trace with about 4% rubber aggregate substitution and approximately 15% LRC-S, replacing the cement. However, it can be affirmed that the use of concrete bricks with residue for sealing is technically feasible, in order to reduce the volume of discarded waste, obtain a cheaper product and still meet the criteria required by the standards.



Tijolo de concreto, Resíduos de borracha de pneu, Lama residual de concreto, Planejamento experimental, Concrete brick, Waste tire rubber, Concrete sludge waste, Experimental design


PEREIRA, R. R. Planejamento experimental e otimização de processos na definição de traço de concreto com resíduos para produção de tijolos. 2018. 94 f. Dissertação (Mestrado em Modelagem e Otimização) - Universidade Federal de Goiás, Catalão, 2018.