Selection and construction method of cement wall coating

The cement wall can't be brushed with ordinary paint, otherwise it will fall off, and the corresponding special paint for concrete can be used. Details are as follows:

Wall treatment

For cracks and defects on the wall surface, the civil contractor shall complete the repair work 28 days before the painting construction in accordance with the relevant technical regulations on the repair of cracks and defects in wall concrete.

Treatment of embedded parts and steel bar heads

If there are other embedded iron parts on the cement wall, a V-shaped cut with a depth of 50px should be made in the concrete around the embedded parts and the rebar head to expose the embedded parts and rebar head, and the rebar head and the embedded parts should be cut off with an electric cutting machine to make them lower than the concrete coating surface by 50px; After the surfaces of embedded parts and steel bar heads are derusted and polished, and the treatment level reaches St3 specified in GB/T8923, epoxy zinc-rich primer or epoxy thick slurry antirust paint shall be pre-coated.

surface treatment

Surface treatment, manual mechanical polishing, according to different situations, electric grinding wheel, pneumatic wire wheel, manual wire brush and other tools can be used to polish the concrete surface, remove the surface pan-alkali and attachments, and level the concrete (columns, load-bearing beams, etc.). ) The surface can be moderately roughened with electric tools to increase the surface roughness.

Apply sealing paint

No matter what the quality of reinforced concrete is, micropores always exist when sealing paint is applied. In order to close the micropores of reinforced concrete and prevent the penetration of corrosive media, epoxy sealing layer must be used for priming. Before painting, ensure that the surface treatment and dryness of the road ahead meet the requirements.

Putty scraping layer

Putty layer, according to the situation of concrete surface, fills holes and defects on concrete surface by putty scraping, improves the smoothness of concrete surface, and achieves surface strength and beauty. Special batch of wall putty can be used, which requires good scraping performance, shrinkage resistance and sag resistance, and good adhesion with sealing layer and intermediate layer. Putty must be polished before the next process can be painted.

Primer and topcoat

Apply two coats of primer, which can be styrene-acrylic. Apply topcoat for 2-3 times. Top coat not only has decorative and warning functions, but also has comprehensive properties such as corrosion resistance, wear resistance and aging resistance. If it is exterior wall coating, it is recommended to brush acrylic acid; if it is interior wall coating, it can also brush styrene-acrylic coating.