The Effect of Dispersible Latex Powder on Foam Concrete

What is dispersible latex powder?

The redispersible latex powder product is a water-soluble redispersible powder, divided into ethylene/vinyl acetate copolymer, vinyl acetate/vinyl tertiary carbonate copolymer, acrylic acid copolymer, etc., powder bonded after spray drying It uses polyvinyl alcohol as a protective colloid. This powder can be quickly redispersed into emulsion after being in contact with water. Because redispersible latex powder has high bonding ability and unique properties, such as: water resistance, construction and heat insulation, etc., their The scope of application is extremely wide.

What is the role of dispersible latex powder in foam concrete?

Foamed concrete can be prepared by physical mixing of dispersed latex powder, inorganic gelling materials, active admixtures, inert fillers and admixtures. When the foamed concrete raw materials are mixed with water on site, under the action of the hydrophilic protective colloid and the mechanical shearing force of the mixer, the rubber powder particles are dispersed in the water. The time required for the dispersion of the redispersible latex powder in water is very short. But it can quickly form a film, which is enough to prove that the redispersible latex powder disperses quickly in water. The different components of the rubber powder have an impact on the fluidity of the foamed concrete and various construction properties, that is, the affinity of the rubber powder to water during dispersion, the different viscosity of the rubber powder after dispersion, the air content of the mortar and the distribution of bubbles The influence of rubber powder and the interaction of other additives, etc., make different latex powders have the functions of increasing fluidity, thixotropy and viscosity.

What is the main mechanism of redispersible latex powder to improve the workability of foamed concrete?

The main mechanism that redispersible latex powder improves the workability of foamed concrete is: the foam stabilizing effect of latex powder increases the bubble volume of foamed concrete. At the same time, it plays a role of lubrication. When the latex powder is dispersed, it protects the colloid against water. The affinity of the foamed concrete and the subsequent increase in the viscosity of the foamed concrete improve the cohesive force of the foamed concrete during the in-situ pouring process, so as not to disturb the dynamic foam, so the workability of the foamed concrete is greatly improved.

（1）The redispersible latex powder is dispersed and formed into a film, and acts as an organic adhesive to exert its reinforcing effect

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（2） The protective colloid is absorbed by the foamed concrete to make the film formation of the redispersible latex powder in the system stable

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（3）The polymer resin after film formation is distributed as a reinforcing material in the entire foamed concrete system, which increases the cohesion of the foamed concrete.

（4）For freshly mixed mortar, redispersible latex powder can improve the foam stabilization ability of foamed concrete, improve fluidity, and enhance water retention.

（5）For the hardened foamed concrete, the redispersible latex powder can increase the tensile strength, increase the bending strength, reduce the elastic mold, improve the deformability, increase the cohesive strength, reduce the carbonization depth, and reduce the water absorption of the material Sex, so that the material has excellent hydrophobicity.

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