It is very important to select plates to eliminate

2022-07-22
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In the complaints about interior decoration, the cracking of partition walls and ceiling plates has become one of the most prominent problems. Insiders pointed out that plate cracking is closely related to design, material selection, construction and other factors. Unreasonable design, material selection fails to meet the requirements and construction does not pay attention to details will lead to plate cracking

in the complaints about interior decoration, the cracking of partition walls and ceiling plates has become one of the most prominent problems. Insiders pointed out that plate cracking is closely related to design, material selection, construction and other factors. Unreasonable design, material selection fails to meet the requirements and construction does not pay attention to details will lead to plate cracking

Runtai decoration Leiyang decoration

the most common cracks in partition walls and ceiling plates are middle full-length cracks, corner cracks, and cracks in contact with the wall. In terms of the characteristics of the material itself, there are mainly the following reasons for cracking:

first, the material is brittle, with low tensile and bending strength and low ultimate stress

second, the material has high hardness and poor impact strength, so it is easy to crack as a whole during damage, which has durability problems

third, the material has a high moisture expansion rate, and the damp plate will absorb moisture and expand, which is easy to cause wall deformation, and even lead to the cracking of the whole wall in serious cases

fourth, the material has high water absorption, which is easy to cause joint cracking and surface decorative layer peeling

take the gypsum board and calcium silicate board, the most common decorative boards in the market, for example. Gypsum board belongs to light flexible materials, while calcium silicate board belongs to brittle materials. In terms of impact resistance, flexible materials will be more stable, and brittle materials are more prone to cracking. In addition, the stacking drying and autoclave process used in the production process of calcium silicate board may bring performance differences at different positions of the same board, and the post-processing and production of wedge-shaped board may lead to changes in the mechanical properties of the finished product, which also become a hidden danger of cracking

it is understood that gypsum board not only has excellent thermal insulation performance (its thermal conductivity is 71% lower than calcium silicate board), but also has very good ventilation and moisture storage functions. When the humidity is high, it absorbs moisture, and when it is dry, it releases moisture. The moisture expansion and water absorption of gypsum board will be relatively low, and some technical gypsum boards can reach 0.015% and 4%

calcium silicate board is reinforced by tobermorite (“ tobermorite ” crystal) plus asbestos, pulp and other fibers& ldquo; Tobe mullite ” Crystals are formed by the reaction of siliceous materials (quartz sand) and calcareous materials (hydrated lime) under high temperature and high pressure (autoclave). The strength of calcium silicate board is determined by the formation of tobermorite crystals. If tobermorite crystals are not formed enough, the strength of calcium silicate board will drop sharply. In order to control the production cost, the tobermorite crystal of the general calcium silicate board is not formed enough, only using the strength of the cement itself and a small amount of calcium, which also makes the board have adverse reactions such as unstable quality, easy deformation, high moisture swelling rate (generally 0.20%), high water absorption rate (generally 40%), and easy cracking. Its moisture swelling rate and water absorption rate are ten times that of the paper gypsum board. The congenital deficiency makes its cracking inevitable

the wall board has a high wet expansion rate. When the board is damp, it will absorb moisture and expand, and the drying shrinkage is significant, which will cause wall deformation, and even lead to the cracking of the whole wall. With high water absorption, the material will be more vulnerable to moisture erosion. During joint treatment, the moisture in the joint material will be quickly absorbed by calcium silicate board, which will affect the final joint strength, and it is very easy to crack in wet seasons. Tests have shown that 20 ~ 25mm wide cracks will appear in a 10 meter wall or ceiling facing a wet expansion rate of more than 0.20%

plate cracking not only affects the effect of decoration, but also brings waste of labor and materials and increased maintenance costs, as well as safety hazards such as ceiling accommodation and fire prevention. In some hotel decoration projects that require acoustics, plate cracking will sharply reduce the acoustic effect. Take a 45 dB partition wall as an example. Once cracks occur, the sound will be transmitted through the cracks, even if 99.9% of the sound can be separated, At most, the sound insulation can only reach 20 dB, which is certainly not in line with the hotel sound insulation standard

experts in the industry suggest that selecting high-quality boards can not only effectively avoid cracking and achieve beautiful results, but also create a more comfortable and safe decorative space. Choosing gypsum plasterboard to avoid cracking should be a good choice

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