Self compacting concrete is a kind of high-performance concrete, which has high workability, i.e. high fluidity, high resistance to segregation, high clearance and high filling. It realizes that the concrete mixture can fill the space in the formwork without vibration under the condition of self weight, and forms a uniform and dense concrete structure after hardening.           
In recent years, with the development of concrete technology, the application of self compacting concrete is more and more popular, but many self compacting concrete in the mix proportion trial mixing process, there will be prepared concrete although the working performance and other indicators are ideal, but due to the large air content of concrete, its strength is low and so on. Therefore, we can add defoamer properly in the process of preparing concrete, reduce the air content in concrete, so as to improve its strength.