In the process of concrete production, the generation of bubbles is almost inevitable. Moderate air bubbles can improve the durability and frost resistance of concrete, but excessive air bubbles can reduce strength, increase porosity, and even lead to surface defects. Therefore, it is crucial to choose and use defoamers reasonably.

Concrete defoamers can be divided into several categories based on their chemical composition: organosilicon, polyether, mineral oil, and composite. Each type is suitable for different concrete systems. The characteristics of organosilicon are fast defoaming and good stability, but it may affect the surface wettability of concrete, making it suitable for high-strength concrete and prefabricated components. The characteristic of polyether is good compatibility, suitable for pumping concrete, but may fail at high temperatures, suitable for the application of commercial concrete and high fluidity concrete. The characteristics of mineral oil are low price, poor durability, easy layering, and suitable for low-grade concrete and temporary engineering. The characteristics of the composite type are excellent comprehensive performance, strong adaptability, and suitability for complex environments such as high temperature and high alkali.                       

Therefore, the selection of concrete defoamers needs to comprehensively consider three factors: engineering requirements, material compatibility, and construction conditions. The correct choice can not only improve the strength and durability of concrete, but also reduce maintenance costs in the later stage. It is recommended to conduct small-scale experiments before key projects to optimize the mix ratio and ensure optimal results.