The main factors that affect the epoxy mortar floor coating
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The common substrate materials for epoxy resin mortar floor coatings are concrete, cement mortar, terrazzo, and steel. The main factors affecting floor painting are as follows:
1. Substrate Surface Flatness The substrate surface roughness refers to the unevenness of the substrate surface. Judgment method: Use a 2m ruler and use a feeler gauge to measure the gap under the ruler, generally below 3mm.
2. Insufficient basal strength The strength of the basal plane will cause the epoxy mortar floor coating to be pulled away from the substrate, or the failure of the underlying layer, causing damage to the entire surface. General requirements for substrate compressive strength ≥ 25Mpa. Judgment method: Use a wire brush or a metal rod to rub the base surface. If sand starts, the strength is not enough. Use a small hammer to hit the base surface. If there is an empty drum, you must take measures such as grouting.
3. Basement Dryness Concrete and mortar contain water in the ground, which reduces the bond strength between the coating and the base layer. It also causes blistering and delamination of the coating. The method of determination is as follows:
1 Moisture content testing equipment to detect the base surface water content, generally required to control below 6%.
2 According to the method of ASTM 4263, take a 46cmx46cm plastic film flat on the surface of the concrete and seal the periphery with tape. After 16 hours, water droplets or blackened concrete surface appeared under the film, indicating that the concrete base layer was too wet to be used for construction.
3 Grass-roots drying time generally requires 28 days or more.
4. Substrate attachments are on the surface of the cement base and are usually attached to cement dust during construction. Especially on the newly constructed concrete surface, there will usually be cement laitance (concrete free body, loose