Brush treatment is a kind of construction method, mainly used in tiling, because the smooth wall tiling is not very safe and firm. There are three ways to roughen the wall. One is to cut many grooves in the wall with a cutting machine, and the other is to pat the wall with a broom dipped in cement slurry, so that the cement slurry will seep in and form a bulge on the surface.
The last one is high-pressure water roughening, which uses ultra-high-pressure water jet to draw many deep grooves directly on the wall. At present, the "quilt" in highway construction is also generally treated by napping. Draw many roads on the old road surface, clean them up and then roll them with asphalt stone. The purpose is also to improve adhesion.
Extended data:
Pavement roughening
1. Before plastering, clean corners and joints, remove mucilage, and fix corners and missing corners. Plastering generally uses a small electric mill. First, install the disc for rough polishing, and then install the fine blade for polishing. During operation, it should be leveled back and forth, and the operator should plaster back and forth, overlapping a part. After concrete leveling, the initial plastering will be carried out 10 minute, and the winter construction will be postponed. After the plasterer is leveled, it is sometimes gently dragged horizontally with a mop tape.
2. After plastering, when a dent with a depth of about 2mm can appear by pressing lightly with the index finger, it is the best napping time, and the napping depth is 1 ~ 2 mm. ..
3. When napping, the napping device should lean against the template and move in the direction of the cross slope, and it is not allowed to stop over once, so that the napping texture is smooth and beautiful, and a connecting groove is formed, which is beneficial to drainage.
References:
Baidu encyclopedia-nap therapy