With the deepening of research, people have found that there are many reasons for cracking of aerated concrete, mainly concentrated in: production process, raw material quality, construction operation factors, cracking caused by block expansion and shrinkage, carbonization Caused by cracking, cracks caused by temperature changes, cracking caused by freezing and thawing, etc. Wall-Mounted Basin Faucets,Wall Mounted Bathroom Faucet,Wall-Mounted Faucets For Modern Basin,Wall Mounted Concealed Basin Faucet Kaiping Jenor Sanitary Ware Co., Ltd , https://www.jenorsanitary.com
With the deepening of research, people have found that there are many reasons for cracking of aerated concrete, mainly concentrated in: production process, raw material quality, construction operation factors, cracking caused by block expansion and shrinkage, carbonization Caused by cracking, cracks caused by temperature changes, cracking caused by freezing and thawing, etc.
Some research scholars believe that the causes of autoclaved aerated concrete cracking are as follows:
The steam-free aeration block device a, because the thickness of the adsorbed water molecular layer depends on the relative humidity in the system, when the relative humidity decreases, the thickness of the adsorbed water molecular layer decreases, and the corresponding disassembly pressure also decreases, and the distance between the two solid particles It becomes smaller and produces shrinkage deformation. The capillary pressure changes from saturation to unsaturated. The shrinkage caused by the loss of water in the capillary hole accounts for about 80% of the shrinkage caused by the normal conditions, and it causes shrinkage at a relative humidity of 95% to 50%. Due to the drying, the water surface in the capillary å‘L is lowered, and the radius of the meniscus (r) is formed in the capillary. Under the action of the surface tension (Q) of the water and the meniscus, the pressure inside the water is smaller than the external pressure. The formula shows that the relationship between relative humidity and capillary pressure difference is: as the relative humidity decreases, the water in the capillary is continuously lost, and the pressure difference between the capillary holes becomes larger and larger, which leads to the shrinkage of the aerated concrete equipment of the aerated concrete block. Deformation. However, the large pores have a lower capillary suction function, and the absorption of moisture is mainly affected by the capillary force of the small pores.
b. Adjacent particles ask for the disassembly pressure of the adsorbed water molecules. In a system under certain conditions, a layer of water molecules with a certain thickness is adsorbed between adjacent solid particles. When the thickness of the water molecule layer exceeds the inherent distance of adjacent particles, a certain disassembly force is generated for the adjacent particles.
c. The tension of the surface of the colloidal particles.
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