Fabricação e adição de produto dispersante como agente plastificante na matriz de concreto

Abstract

Concrete is the second most consumed product in the world. The Brazilian cement industry plays an important role in the national and international scenario, having ranked fourth among the largest concrete producers in 2014, according to the Brazilian Association of Portland Cement - ABCP (2017). With the advancement of materials technology in the production of concrete for the most diverse applications in works, additions were developed in order to improve the characteristics in the fresh and hardened state. The present work aims at the production of a dispersant product based on biodegradable elements seeking similar effects to the commercial plasticizer additive in relation to the reduction of consistency and subsequent evaluation of its influence on resistance to simple compression and capillary absorption capacity. In the course of the research, it was possible to evaluate considerable results in terms of the reduction of consistency, indicating a higher workability of the matrix after tests of the specimens manufactured with the dispersant in the concrete, commercial plasticizer additive, sodium acetate and without additive. However, there was a reduction in compressive strength when compared to the reference concrete results, as well as higher rates of capillary absorption, compared to the reference concrete and added with commercial plasticizer. In this way, it is understood that the dispersant product gave satisfactory results of reduction, however, it caused the reduction of compressive strength, possibly by incorporation of air observed also during the mixing, being necessary study of experimental dosages in order to find the optimal proportion that allow the reduction of the abatement without causing a significant reduction in compressive strength.