Wall cracks are the most common problems in home improvement. This paper briefly explains the solution to the cracking of the wall due to the cracking of the wall.
First, problem analysis - five kinds
The situation leads to wall cracking
After the accumulation of thousands of home improvement projects, the experts summarized the causes of five kinds of wall cracks:
1) There is a crack in the insulation layer of the original house, which results in cracking of the wall surface after renovation;
2) Improper repair of the wall after slotting, resulting in wall cracking;
3) The proportion of cement in plastering is inaccurate, and if the ratio is high, it is easy to crack;
4) The wall putty is not properly proportioned or scraped unevenly;
5) The mix ratio of latex paint and water is not suitable.
Second, the solution
1. Problems to pay attention to when constructing a wall
The first is the proportion of cement and sand, the best ratio is 1:3, improper matching will affect the toughness and tension of the wall; second is to find the ratio of putty and latex paint, when painting latex paint, More water will cause problems. The transformation of the circuit must begin with the carpentry foundation. Because after the slot to allow time to repair, cement mortar drying rate, shrinkage and putty powder is different, the first repair will appear after the contraction sinking, so do the wall when the construction of the second repair, so as to leveling Walls to avoid cracking. When the color wall paint cracks and other issues, the effect of local repair is often not good, because the color wall paint repainting will appear significant color difference. If the insulation board is cracked, use a putty knife to cut the cracks as deep as possible, fill in the plaster, be sure to fill in the plaster, fill it evenly, and then use a bandage, bean bag cloth or white cloth to stick the cracked place, and then dry it. Putty or do other processing. If the crack is serious, you can also use kraft paper or newspapers to make joints, and the effect is better.
2. Elastic mortar technology
Polymer mortar technology, its technical characteristics is that by adding some special polymer materials to the cement mortar (putty, coatings, etc.), thus changing the performance of the mortar, so that the mortar has a certain degree of elasticity (extension can be done according to the needs of 200 %), at the same time improve the adhesive strength, strength, etc. of the mortar to overcome the problem of wall cracks caused by the rise and shrinkage of the slat wall caused by humidity changes and temperature changes.
Its use is also varied:
1) Strip-bonded elastic mortar: Used for bonding (materials) between the plate and the plate in the concave and convex grooves. The main role is as follows: With the seasonal temperature and humidity changes in the sheet metal shrinkage, stress concentration at the joints of the slats, and play a regulatory role. Under normal circumstances, one wall (generally about ten seams) can be done for each seam, or one or two expansion joints (as the case may be), and several other seams are made of ordinary mortar as the joint material. The method of use can determine the specific mortar formulation and construction method according to the climatic conditions in different regions, different construction seasons, and the like.
2) Surface treatment of strip joints Elastic mortar: The surface of the slats at the joints of the slats after the slats are installed in the wall, in front of the putty (or before painting). The joints reinforce the elastic mortar to solve the problem of the stress concentration of the slats at the joints of the slats, that is, the contraction stress is dispersed, and cracks on the wall surfaces of the slats are avoided.
3) Elastic putty (a kind of elastic mortar): used for scraping the surface of the slat wall after installation.
4) Elastic coating: It has a high elasticity itself and can cover the wall surface microcracks.
3. Fiber Mortar Technology
Principle: The paint on the wall of a house is generally used as a plaster-like material called "majiang lime". The raw material is a mixed plaster material of lime paste and plant fiber (mash) to improve the painting material on the wall surface. The tensile strength prevents the appearance of crack cracks. The use of fiber mortar can increase the tensile strength of wall paint materials and prevent the appearance of wall cracks. The fiber used for the mortar is a special fiber for mortar. At present, the special fiber for mortar produced by DuPont Co., USA has the best performance, high strength, stable chemical properties, good affinity and binding force with mortar, no water absorption, high resistance to acid and alkali salts, and non-toxic materials. . It not only changes the physical structure of the mortar, but also does not affect the chemical properties of various materials in the mortar. The special fiber placed in the mortar can contain about 50 million fibers per cubic meter of mortar, about 20 fibers per square centimeter, forming micro-fiber cement interwoven structure, strong cohesiveness, good mortar toughness, and improved mortar performance.
Third, construction examples
During the construction process of a project, the construction unit will share experiences with Party A and supervisors and adopt some good pre-control measures on detailed practices.
1) All the joints of different bases, after the closure of the mouth and the mouth, water and electricity box plugging the joints, before the putty must be coated with white latex paste fiberglass cloth, to prevent the occurrence of cracks in the wall surface;
2) Before the aerated concrete masonry is plastered, double-faced steel nets are attached and watered to wet the walls to prevent cracks in the plaster surface;
3) Since the balcony vertical plate is a 50 mm thick C20 fine stone concrete cast-in-place board, this work is prioritized when the secondary structure is constructed so that possible cracks develop first and stabilize as early as possible. All over the elastic paint, a layer of glass fiber cloth is applied to the inner wall paint during construction;
4) Use high-quality water-resistant putty for wall decoration to avoid cracking on the surface of the decorative layer. Through the above measures, the phenomenon of wall cracking has been controlled. In a similar manner to this method, a wooden face is embedded at the joint between the wooden frame of the closet and the concrete upright, and a wood trim is applied at the joint between the lower edge of the wooden curtain case and the aluminum alloy side keel to cover the cause. Cracks that may occur due to different materials have a good effect. The hinges, handles and other hardware accessories used for installing wooden doors and closet doors are made of high-quality materials to ensure the quality of the works.
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