Influência de adições minerais pozolânicas no processo de carbonatação do concreto.

Abstract

This study aimed to analyze, the through a literature review, results of tests with the addition of fly ash, silica fume, and metakaolin in different percentages of addition and substitution in mass to cement in to obtain, thus, an analysis of the influence of these additions on the concrete carbonation process. Secondly, to help understand the influence of these additions, the results obtained for compressive strength and water absorption were also extracted from the selected works. To get the answers, we sought to analyze the results of depth and carbonation coefficient, compressive strength, and sorptivity of concrete produced by several authors. Therefore, the method of bibliographic review was chosen to obtain and collect data through a search for keywords in the primary research bases such as SciELO, Google Scholar, among others. In general, the data from the selected studies allow us to conclude that the mineral additions promote mechanical improvements in the concrete by refining the structure of the hydrated cement paste, on the other hand, the pozzolanic additions consume the Ca(OH)2 reserve of the concrete, making -the most susceptible to carbonation. Through the study, variability of methods, different test conditions, and use of materials can be seen, making it difficult to standardize the analyses. In this way, generic conclusions are obtained, but they serve as a guide for future research. Keywords: Concrete. Carbonation. Pozzolanic mineral additions.