What is sandblasting for exterior walls?

Sandblasting process is a new construction process of concrete surface treatment. It is mainly used to solve the wall plaster drums, easy to crack the quality of the common disease, to increase the beauty of the living surface.

I. Principle of sandblasting process

Sandblasting process is with the help of air compressor pressure, will be specially prepared slurry sprayed to the surface of the concrete base layer, the formation of uniform point-like body, after a certain period of time maintenance, so that it reaches the ideal strength, so as to increase the adhesion between the grass-roots level and the plaster layer, to achieve the purpose of preventing cracking of hollow drum.

Two, sandblasting process

Cleaning up the grass-roots level → wetting the wall surface → preparation of materials → sandblasting construction → maintenance.

Three, sandblasting construction materials and features

(1) sandblasting powder;

(2) sandblasting glue;

(3) construction sand;

(4) auxiliary materials.

Sandblasting thickness of only 1 ~ 3mm, just ordinary brushing thickness of 1 / (3 ~ 4), which will inevitably require sandblasting materials in all aspects of the index must be too hard, otherwise it can not guarantee the bonding strength and other aspects of the requirements.

Specialized sandblasting powder is prepared by high-quality water retention and enhanced high-performance additives.

Sandblasting special adhesive adopts synthetic resin emulsion as the base material, this kind of material is characterized by good permeability, can fully penetrate into the grass-roots level, water resistance, excellent resistance to freezing and thawing performance, compression, folding, tensile strength and other indicators are better than the water-soluble adhesive, the disadvantage of the penetration, and the ease of poor penetration can not be very well penetrate into the grass-roots level, the molecules in the surface of the interface to travel, and the material is easy to produce many tiny holes after degradation. Produce numerous tiny holes, these holes will reduce the strength of cement mortar, so it is not suitable as a bonding material to improve the performance of the interface.

Four, sandblasting construction precautions

Sandblasting construction should be cleaned up before the grass-roots wall dust, repair small holes, if the surface of the grass-roots level there is a film releasing agent, the application of steel wire brush will be a film releasing agent to brush clean. After the grass-roots level is cleaned up, the wall surface will be sprayed with water to fully wet the depth of 3 mm or so, and the sandblasting construction should be in a wet state.

Five, sandblasting material ratio and precautions

Sandblasting material ratio should be prepared according to the powder: sand = 1: (1.5~2.0), and add sandblasting glue mixing, mixing time should be 1.5~2.0min. mixing materials should be used up between 2.5~3.0h, to prevent hardening.

Sixth, construction steps

Construction of the air compressor pressure shall not be less than 8Mpa, in order to ensure the adhesion of sandblasting. The spray gun should be kept perpendicular to the wall at a distance of 30~50cm, and the construction should be carried out at a uniform speed from the top to the bottom or from the left to the right. The height of the sandblasting point is 1~3mm, the diameter of the bottom is about 2mm, in order to form a point, mesh uniform coverage of grass-roots level is appropriate.

Seven, sandblasting surface maintenance

Sandblasting end of the wall to be the beginning of condensation after the beginning of water spraying maintenance, general 1d water spray 3 ~ 5 times, to reach the strength of plaster construction.

VIII. Comparison of sandblasting process and traditional construction process

Artificial brushing method of low construction intensity and slow construction speed. Generally, the thickness of brushing is 3~10 mm, and the difference between concave and convex is big, so that the next plastering and leveling process is labor-intensive and material-intensive. Sandblasting construction pressure is high and fast, the construction surface is flat, uneven and even, as a reserved decorative surface is very beautiful, and the plaster leveling saves labor and materials. Because of sandblasting and plastering thickness reduction, will inevitably increase the available space, and reduce the weight of the building.

Nine, sandblasting process application range

Sandblasting process is mainly used in the need for plastering, tiling and other parts of the interface materials with excellent performance, but also a beautiful and generous reserved decorative surface.

Nowadays, many projects require 1.8 m high waterproof layer for toilet and bathroom, and the general construction method is to do plastering on the waterproof layer after pulling and pasting tiles. If the sandblasting process can be directly on the waterproof layer construction, so that the plastering, brushing process into one, both labor-saving and material-saving.

The application range of sandblasting process is far beyond this. As a decorative protective layer of the roof waterproof layer, color sandblasting can change the monotony of today's thousands of houses, adding brilliant colors, from a high place overlooking, a unique flavor. As a new style of exterior wall decoration, it is similar to real stone paint, but different from real stone paint, is a small relief pattern effect, unique.

In addition, color sandblasting can be used as the interior decoration of small decorative pools instead of pasting tiles, because small decorative pools have a variety of shapes, it is not easy to paste tiles, sandblasting instead of both beautiful and easy to construct.