Utilização de resíduos sólidos de fundição como matérias- primas para fabricação de blocos de concreto para pavimentação

Abstract

The generation of solid waste in urban centers is related mainly to the increase in population and the intensification of the processes of industrialization. The management since its origin, production, processing, recycling and final destination of such waste is currently one of the biggest challenges of generating companies, research institutions, government agencies and companies alike who seek a solution to minimize or even eliminate the generation of waste or recycling and subsequent use in various fields of industry, or even turning them into products of commercial interest. In this sense, the foundry waste generated during the production of cast alloys have been studied for use as a by-product in different industries, such as own foundry and construction. This study evaluates the feasibility of applying two different residues of foundry, spent phenolic sand and spent green sand as raw material with value added, this being used in the manufacture of concrete block paving, evaluating its transformation to co-product. Some studies have demonstrated the potential application of the wastes in various forms and in different industry sectors. The specific applicability of these residues depend on their characterizations, whether environmental, chemical, physical or phases, this being a fundamental step to assess the feasibility of recycling and economic. Thus the characterization of this waste was configured in the key step of the work and then consign them to a better technological application. Blocks were made with 0%, 25% and 50% replacement of natural sand per by-product. These blocks were analysed for compressive strength at 7 and 28 days of curing, water absorption, abrasion strength, porosity index, SEM, environmental assessment and financial feasibility of the blocks generated with the use of the by-product. The mark with having to replace 25% of combination of two foundry waste showed the best results in both compression strength as the abrasion strength. Blocks using the combination of foundry waste were environmental ly classified as Class II A - Not Inert and had lower costs in producing concrete block paving.