ANÁLISE DA REATIVIDADE POTENCIAL ÁLCALI-AGREGADO EM ROCHAS QUARTZITICAS PROVENIENTES DO SUL DE MINAS

Abstract

The construction industry is one of the sectors that most move the national economy, consequently the largest consumer of natural resources. Portland cement is one of the most used materials in civil construction, and is also one of the main sources of pollutants in the activity. Another aggravating factor is the exploitation of quartzites in mining operations, which generates a large volume of waste, generating negative environmental impacts. For the reduction of waste from improperly disposed quartzites, one of the alternatives is the use as aggregate in civil construction, as a component material of concrete. The work aimed to evaluate the potential alkali-aggregate reactivity in quartzite rocks from the south of Minas. Mortar expansion tests and visual analysis were performed. As a comparison, the same analyzes were made on two different lines. A good performance was found for the standard trace (CPV ARI + Areia IPT), in the analysis of expansion in mortar bars, compared to trace 1 (CPV + Quartzite), which presented expansions that exceeded the limits determined by NBR 15577-4: 2018. The results presented in general are in accordance with the studied biographies. In addition, none of the samples showed visible surface degradation or bending. Although CPV-ARI has a high purity and no additions capable of controlling the development of the alkali-aggregate reaction, in the standard trace (CPV ARI + Areia IPT) the RAA did not develop.