Application

Cement additives, and molding adhesives.

Polyvinyl alcohol (PVA) is a high molecular weight polymer commonly used in the production of materials such as fibers and membranes, and is also widely used as an additive in building materials. PVA building admixtures can improve the performance of cement concrete, including increasing its strength and plasticity, improving its crack resistance and durability.

The use of polyvinyl alcohol in cement:

1. Reduce cement usage

By adding an appropriate amount of polyvinyl alcohol, concrete can have better fluidity and plasticity, thereby reducing the amount of cement used. The amount of polyvinyl alcohol added to concrete is generally between 0.1% and 0.5% of the total amount of concrete, and can be adjusted according to the actual situation.

2. Improve the performance of concrete

After adding polyvinyl alcohol, the voids in the concrete decrease, leading to an increase in the density of the concrete, thereby improving its strength and durability. Meanwhile, polyvinyl alcohol can improve the crack resistance of concrete and reduce its shrinkage rate.

3. Improve the plasticity of concrete

Cement can cause shrinkage during the solidification process, leading to cracks and defects in concrete. Adding polyvinyl alcohol can increase the plasticity of concrete, reduce cement shrinkage, and thus reduce the defect rate of concrete.

4. Improve the durability of concrete

Moderate addition of polyvinyl alcohol can improve the durability of concrete. Polyvinyl alcohol can reduce the permeability and moisture absorption of concrete, slow down the aging and corrosion rate of concrete, and thus improve the durability of concrete.

In summary, polyvinyl alcohol is widely used as an admixture in the field of concrete, which can improve the performance of concrete, reduce cement dosage, and improve the durability and plasticity of concrete. Meanwhile, the rational use of polyvinyl alcohol can also reduce the cost of concrete construction and improve engineering quality.