Abstract
This study discusses and analyzes an alternative of IOT reuse as addition in structural mortars, evaluating the influence of IOT addition contents. The material was physically and chemically characterized. Structural mortars were molded with 10%, 20%, 30% and 40% of addition of IOT in relation to cement mass. We investigate physical properties, mechanical indicators, durability indicators and microstructure. The tailings are composed of predominantly quartz, hematite and goethite, and no components were found that could compromise the cementitious composites. The addition of IOT provided a tendency to reduce open porosity. The addition of 30% IOT was the most efficient in closing pores. All addition contents led to the maintenance or gains in mechanical properties, and a 10% gain in flexural tensile strength was observed for the addition of 10% IOT. The addition of 40% IOT promoted a 14% gain in compressive strength and maintenance of flexural tensile strength. This addition content evidences that the carbonation depth was not significantly affected. Based on the results, the addition percentages of 30-40% are interesting as to the analyzed properties.
Highlights
The mining sector is of great importance
This study discusses and analyzes an alternative of IOT reuse as addition in structural mortars, evaluating the influence of IOT addition contents
All addition contents led to the maintenance or gains in mechanical properties, and a 10% gain in flexural tensile strength was observed for the addition of 10% IOT
Summary
The mining sector is of great importance. It contributes strongly to the economy of Brazil. Iron is the main mineral extracted and exported. According to the Brazilian Mining Institute (IBRAM, 2018), 430 million tons of iron ore were produced in 2017 alone, and almost 90% of this amount was exported. Brazil occupies a prominent position as the world’s third largest producer and exporter of iron ore, following only China and Australia (National Mining Agency [ANM], 2018). With such an intense activity, large amounts of tailings are generated by the extraction (sterile) and beneficiation (tailings) of the ore depending on the deposit and the mining company. On average, each ton of ore extracted generates 400 kg of tailings during the beneficiation process (Dauce, Castro, Lima, & Lima, 2018)
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