Laboratory characterization of mining waste as an alternative aggregate for asphalt mixtures
DOI:
https://doi.org/10.6008/CBPC2179-6858.2018.005.0009Keywords:
Mining Residue, Characterization of Aggregate, Asphalt MixtureAbstract
The processes of extraction and beneficiation of iron ore, while promoting the economy and world development, generate large amounts of waste that need adequate destination and/or disposition. In turn, the great environmental appeal generated by this scenario requires technical and economical-sustainable solutions so that mining companies and the environment can coexist. Brazil, which has a transport matrix based on the modal road, with predominance of flexible pavements based on asphalt mixtures in the coating layer, is part of the world market with an economy directly associated with mineral extraction and recently suffered its greatest disaster environmental degradation due to the rupture of a dam of this type with environmental, material and human losses. In the present work, the physico-chemical characterization of residues of the process of iron ore beneficiation for use in asphalt mixtures was carried out through conventional granulometry and laser diffraction tests, Aggregate Image Measurement System (AIMS), Electron Microscopy (MEV), sand equivalent, density, Dispersive Energy Spectroscopy (EDS), leaching and solubilization. The laboratory characterization showed that the residue behaves as a small aggregate and filler, tending to the fine silty sands, taking into account the physical-chemical, mineralogical and geotechnical parameters required by the current technical standards, being its use in asphalt mixtures as an alternative aggregate conditioned to small percentages in replacement of little aggregate and fíler.
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