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Redispersible polymer is an essential component of joint filler, which is used to fill gaps and cracks in concrete surfaces. The main role of redispersible polymer is to improve the mechanical properties of the joint filler and enhance its bonding strength.

Redispersible polymer is a powder that is made from a combination of polymer resin, filler, and additives. When mixed with water, it forms a liquid emulsion that can be applied to concrete surfaces. The emulsion dries to form a flexible and durable film that fills the gaps and cracks in the concrete.

The addition of redispersible polymer to joint filler improves its adhesion to the concrete surface. It also enhances the flexibility and toughness of the filler, making it more resistant to cracking and deformation. Additionally, redispersible polymer improves the water resistance of the joint filler, preventing water from penetrating the surface and causing damage.

Overall, the role of redispersible polymer in joint filler is to improve its mechanical properties, enhance its bonding strength, and increase its durability. This makes it an essential component of joint filler for concrete surfaces.