Análise da viabilidade técnica da estabilização da taipa de pilão com rejeitos de mineração

Abstract

The use of earth as raw material for building is part of an ancient tradition. To make compacted earth constructions, such as rammed earth, more resistant, it is common to use soil stabilizers to improve its properties. Among the most common stabilizers are cement and lime. However, several authors point out the high polluting potential in almost every phase of the production process of these materials. Therefore, the search for substitutes for certain cementitious stabilizers has been encouraged. In Minas Gerais, the volume of tailings produced by iron ore mining in the region is too high, besides being stored in dams with high risk of collapse. Therefore, this work characterized the iron ore tailings sediment (IOTS) and analyzed its viability in soil stabilization for the production of rammed earth. Through the physical-chemical characterization of IOTS and soil it was possible to realize a potential stabilization by particle size substitution, since the sandy tendency of the sediment indicates good suitability for clayey soils (which is the case of most soils in the state of Minas Gerais). This possibility was proven through the resulting compaction curve, which showed higher values of apparent dry unit weight in samples with higher percentages of IOTS and the compressive strength results, which confirmed adequate compressive strength values with the incorporation of 90 % of IOTS. This research demonstrates the ability to use a residual material that is currently outside the production chain and that could be incorporated in the construction of rammed earth walls.