A two-component elastomeric cementitious waterproofing membrane is a type of waterproofing system used to protect concrete and masonry structures from water infiltration. This system consists of two components that are mixed together to form a waterproofing coating.
The first component is a cement-based powder, typically composed of a blend of cement, fine aggregates, and additives. This powder provides the structural strength and durability to the membrane.
The second component is a liquid polymer-based additive, which is mixed with water and added to the cement-based powder. The polymer additive enhances the flexibility, elasticity, and waterproofing properties of the membrane. It also improves adhesion to the substrate and enhances the membrane's resistance to cracking.
The mixing ratio of the two components is usually specified as a ratio, such as 4:1. This means that for every 4 parts of the cement-based powder, 1 part of the liquid polymer additive is used. The exact mixing ratio may vary depending on the specific product and manufacturer's instructions.
To prepare the membrane, the two components are mixed together thoroughly until a homogeneous paste is formed. The resulting mixture is then applied to the prepared concrete or masonry surface using a trowel, brush, or spray equipment, depending on the product and application requirements. Multiple layers may be applied to achieve the desired waterproofing thickness.
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Once applied, the membrane cures and forms a continuous, flexible, and elastomeric barrier that prevents water penetration while accommodating small movements and cracks in the substrate. It provides protection against water intrusion, moisture damage, and helps to extend the service life of the structure.
