Influence of different dosage of Defoamer For Concrete

Among the additive components, the defoamer should be a small material with the lowest use frequency and addition amount. The smaller the size of the study, the more difficult it is, and the less universal the experimental data and conclusions are. Differences in concrete materials, water reducing agent materials, and defoamer types may make the experimental results have no laws or even point to the opposite direction of theory and experience.
Let's start with a conclusion that has been fully verified by a lot of experiments and supported by theory: the workability of concrete will deteriorate with the increase of the amount of defoamer, while the strength of concrete will increase.
Once in the mixing station customer to make a test, I raised the defoamer from 0.01% of the applied dose to 0.03% after the concrete workability significantly reduced. Therefore, based on past experience, I am also very cautious about the use of defoamer, and I am very worried about the deterioration of concrete workability.
Recently, however, modified air entraining agents have been developed, so the effects of the amount of defoamer on the workability of concrete have been systematically tested several times. The results are strange, but they stand up to verification. After several tests, I have a new view on the use of antifoaming agents.