ANALYSIS OF CARBONATION IN CONCRETE WITH REPLACEMENT OF RECYCLED AGGREGATRES
Keywords:
Civil Construction, Materials recycling, SustainabilityAbstract
Due to its high volume, concrete has become an increasing generator of waste and debris in civil construction. Concrete is obtained by mixing primary materials such as cement, aggregates, and water, which its per capita consumption surpassed only by water. Therefore, the need arises to minimize environmental impacts by exploring the possibility of reusing this waste. This research aims to analyze the influence of carbonation on concrete produced with different percentages of recycled aggregates. Thereby, concrete test specimens were produced using varying levels of recycled fine aggregate substitution and cure proccess. The ARC specimens showed significant strength loss during compression tests, especially compared to those subjected to external curing. While the recycled aggregate exhibited greater susceptibility to carbonation, the differences were not as drastic comparing the reference specimen, indicating that the use of recycled aggregates may be feasible. The results from the 28-day tests showed that, in relation to the reference specimen, there was a 26% reduction in concrete strength, making their use restricted by structural applications. However, this reduction does not prevent their use for other purposes such as paving and subfloors. On the other hand, the test results for the specimens cured in a parking lot using the reference mix showed a minimum 21% increase in concrete strength, enable its use for structural purposes.
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