Study of the properties of conventional concrete with additive or addition of water for consistency correction

ABSTRACT

The fluidity and plasticity of the concrete should be maintained during the displacement to the work, preventing possible changes in the properties. When there are changes, they should be corrected with water or plasticizer additives. Therefore, this is paper aims to evaluate the properties of fluidity and characteristic resistance of concrete. For this, concrete scans were produced with fck equal to 25MPa and S50 consistency. The analysis of the results occurred from three performed experiments, one without the correction of the Slump Test, the second with consistency checks at times of 60, 120 and 150 minutes shortly after the preparation of the mixture. The third, the verification consists of concrete with the same checks as the second, but with the addition of the plasticizer additive. The results obtained indicate that in the reference stroke there was minimization of consistency in 64% over the 150 minutes. The mean compressive strength decreased over time, while water was added. Therefore, the characteristic resistance fell by 7.25% compared to concrete without the correction of the Slump. However, for concrete with additive, the average resistance increased by 16.52% during the 150 minutes. This refers to the fact that the use of additives in the percentages analyzed favors the gain of concrete resistance. On the other hand, when adding water the concrete loses resistance. Therefore, the use of water to correct fluidity is not ideal, since it alters the final resistance of the concrete.

Keywords
Concrete; Additive; Consistency; Dispproval