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Under what circumstances does concrete need to add defoaming agents?
Apr 25, 2024The situations where defoaming agents need to be added to concrete can include the following aspects:
1. Preparation of foam concrete: When preparing foam concrete, it is usually necessary to add a defoaming agent. Foamed concrete is a lightweight material that contains large amounts of bubbles or foam. The role of defoaming agents is to control the formation and stability of foam to ensure the quality, compactness and strength of foam concrete.
2. Concrete Vibration: During the concrete vibration process, a large number of bubbles and foam may be generated. These bubbles and foam will affect the density and strength of concrete, and even cause voids and defects on the surface. By adding defoaming agents, foam formation during vibration can be effectively controlled and the compactness and strength of concrete can be improved.
3. High-performance concrete: Some high-performance concrete, such as self-consolidating concrete (SCC) and high-fluidity concrete, need high fluidity and pumpability. However, these special concretes may produce more bubbles and foam during construction. Defoaming agents can control and reduce foam formation, ensuring the quality and performance of high-performance concrete.
4. Surface treatment and coating: When doing surface treatment, coating or painting of concrete, the presence of foam may affect the adhesion and surface quality of the coating. Adding defoaming agents can reduce or eliminate foam in the coating and improve the adhesion and surface smoothness of the coating.
Whether a defoamer needs to be added needs to be determined based on the specific construction requirements and concrete performance requirements. When selecting and using defoamers, it is recommended to follow the supplier's recommendations and usage guidelines to ensure the desired results are achieved.
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