The importance of concrete floor grinding in floor paint construction

Epoxy floor paint must first confirm the ground condition before construction. If the ground is uneven, there is old paint, there is a loose layer, etc., it will directly affect the overall construction effect of the floor. This can reduce the amount of paint used, increase the adhesion, make the paint film not easy to damage, and make the overall effect look smoother and more beautiful. Before the epoxy floor paint is applied, the ground is ground to face the cement blocks on the new cement floor, and the ash powder plays a good role in removing it, which can effectively open the pores of the cement, so that the epoxy resin primer can better penetrate and exude. Absorption, the quality of epoxy floor paint project plays a vital role.

Therefore, it is especially important to use a special grinder to grind the cement or concrete floor to remove the laitance layer on the surface and make the surface of the base layer reach the required roughness. The purpose is to enhance the adhesion of the coating material to the base layer. There is no requirement for the specific grinding thickness, depending on the original quality of the base layer.

When grinding the concrete floor with a grinder, you can’t miss any places that are not polished, especially many areas with poor strength, must be polished to a place with strength, otherwise, the loose areas will fall off with the coating, and the time It will be very fast, and it may be taken off before the project is settled. At the same time, it is recommended to carry out two rounds of grinding, and the two times are in a criss-cross pattern to prevent leaks and polish more thoroughly.


a. Grinding the base surface before floor construction: use a vacuum grinding machine to polish it

Appropriate roughness is provided for terrazzo base surfaces and smoother and denser cement base surfaces.

1. Remove the floating dust that is not easy to clean on the surface and roughen the base surface to enhance the bonding force between the coating and the ground;

2. The unevenness of the base surface to be treated is basically smoothed to play a leveling role.

b. Grinding by hand grinder:

For places that cannot be hit by a large grinder or oil that cannot be removed, it can be polished with a hand grinder. Note that special diamond polishing pads should be used.

c. Sandpaper polishing:

For places that cannot be hit by large sanders and hand grinders, or areas that do not need to be polished by hand grinders, such as under the production line, sandpaper or wire brushing can be used to achieve the polishing effect.


The basic ground treatment steps before epoxy floor paint construction:

1. Before the construction of epoxy floor paint, the ground should be ground, and the garbage should be initially cleaned first;

2. Use a 2-meter ruler to initially check the flatness of the ground, and clearly mark the parts that affect the flatness and adhesion;

3. When grinding the ground with the dust-free grinder, be careful, especially for the marked parts, and the average walking speed of the grinder is 10-15 m/min;

4. Expansion joints with asphalt, if there are no special requirements in the contract, as long as the asphalt is cut to one millimeter below the ground, so as to prevent the asphalt from being brought to other places during grinding and cause the paint surface to turn yellow; if there are special requirements When the expansion joints are used, the contents in the expansion joints should be completely removed;

5. When the sandblasting machine treats the ground, it should first use a dust-free grinder to grind the raised parts. The flatness basically meets the requirements, and then the sandblasting treatment is unified, so that the sandblasting machine can drive at a basic uniform speed, and the specific speed should be based on the ground strength. And sandblasting effect may be;

6. For the corners, the edge of the equipment or the places that cannot be reached by the dust-free grinder, use a manual grinder to handle and vacuum, but do not damage the walls and equipment;

7. Check the flatness again, and continue to polish the parts that do not meet the construction requirements of the floor paint until the flatness meets the requirements (2m by the ruler is not more than 3mm);

8. Check oil stains, water marks, asphalt, cement lumps, latex paint, cement floating ash, etc., whether the cleanliness requirements are up to standard;

9. The floor paint primer can be applied only after the ground treatment reaches the standard before painting.

Post time: Jun-16-2022