6. Poor construction environment In cold areas, there is no insulation facility on the construction site, and the condensate is absorbed by the gypsum board. When heating, the indoor humidity is still exceeding the standard, which aggravates the cause of the gypsum board being dampened and becoming a cracking deformation.
The Bath Towel is convenience for our bath drying. The smooth microfiber material can massaging our skin and dry our body quickly. It is grateful for our daily use and suitable for all the ladies. Its luxury lovely design is attractive and convenient for all your bathing needs. It is especially suitable for all the ladies. Its elegant design is attractive for ladies. The bath towel is extremely suitable for our daily life.
Bath Towel Bath Dry Towel,Quick Dry Towel,Soft Bath Dress Towel,Smooth Drying Towel FengRun Commodity Co.,Ltd. , https://www.sponges.nl
1. The characteristics of the gypsum board volume stability The general decoration materials are afraid of water, and there is a phenomenon of swelling and shrinking. However, the gypsum board can be said to be a material with better performance in various types of panels. This is because industrial gypsum is formed by heating dihydrate gypsum and discharging crystal water. The gypsum board is shaped and shaped, and water is added to the burned and ground hemihydrate gypsum to re-form the important characteristics of the dihydrate gypsum structure. It separates the needle-like crystal from the gypsum slurry. During the drying process, micropores are formed, which makes the gypsum building material have the characteristics of “gypsum respirationâ€, that is, when the humidity of the air changes, it can absorb moisture, and can quickly re- Dissipated. The linear expansion and contraction of the gypsum board in the air-dry state is negligible. Even if the air humidity reaches 90%, the maximum lateral expansion of the gypsum board is only 0.015% in 24 hours. Therefore, the slight amount of expansion and contraction does not cause the board. The main reason for surface deformation and joint cracking.
2. The influence of the strength of the gypsum board on the deformation The structure of the gypsum board is a plate which is firmly bonded together by the gypsum core and the facing paper. The facing paper acts to withstand the tension and reinforcement, and the face paper The layer has a great influence on the quality of the board, and the sheet that is not firmly adhered to the paper cannot be used. The longitudinal and transverse fibers of the face paper have different strength and elasticity, the longitudinal direction is larger than the transverse direction, and the longitudinal bending resistance and deformation resistance are also stronger. The gypsum board has strong moisture resistance, and the paper layer can extend the time the plate absorbs water, but it does not prevent water absorption. During installation and construction, the strength of the plasterboard will be reduced for a longer period of time or continuous wetness. Therefore, wet boards must never be installed. High temperatures have a certain effect on the strength of the plasterboard. When the ambient temperature of the gypsum reaches 42 OC, the solidified gypsum will start to change the crystal structure and the strength is impaired, so the gypsum board cannot be directly connected to the heater or the like.
3, the design and construction of the light steel keel skeleton structure The rational design of the dragon skeleton, the use of qualified materials and parts, and strict control of construction quality, is an important guarantee to ensure that the ceiling of the QST system is not deformed or cracked. Any mistake or negligence in any of these links can lead to deformation and cracking. For example, if the fixing between the gypsum board and the keel is not in order or the fixing is not strong, the internal force of the plate is generated, and the joint is sheared to cause deformation and crack; the rigidity and straightness of the light steel keel are insufficient, and the spacing is improper. Deformation cracking will occur.
4. The caulking process is the direct factor for the success or failure of the joint treatment. The light steel keel gypsum board ceiling is in various stress states. Therefore, the longitudinal and transverse joints of the gypsum board are affected by various stresses, which requires the board. The joint should be properly seamed, the joint material itself has sufficient strength and cohesive force, and there must be reasonable joint construction technology and high operational skills to offset the tensile stress and avoid cracks. At present, there is no clear regulation on the design of caulking materials. Most of the construction units use caulking putty arbitrarily, and the strength cannot meet the requirements; some construction units use high-grade rubber materials, but the price is expensive; some construction units use double-layer perforated paper tape. Strengthen, or strengthen with a mesh cloth to achieve good results. Therefore, how to grasp the caulking process is very important.
5, not according to the process and the impact of uncivilized construction. When the caulking process is completed, even after the wallpaper paint is finished, the installation work of water, electricity and wind on the ceiling of the wall has not been completed, and the installer steps on the dragon skeleton. Or skid the fixed board, it will cause the joint to crack, and even deform the board surface. Some ceiling designs are not on the subject. Some operators also step on the secondary keel to make the deformation of the skeleton deformed. This situation is especially common in the progress of the project, and management must be strengthened to overcome it. 
October 06, 2020