加气混凝土砌块墙体构成裂缝的启事(国外英文资料).doc

加气混凝土砌块墙体形成裂缝的原因(国外英文资料) The cause of cracks in the walls of the reinforced concrete blocks There are many factors in the formation of cracks in the wall. In theory, the reason of foundation settlement, temperature change, shrinkage deformation and design construction. The most common fissures can be classified into four categories. One is the temperature crack; The second is dry operation contraction crack, short for shrinkage crack. And the fissures created by temperature and shrinkage; Third, the cracks in the design construction; Four is the crack that the construction quality causes. One, the temperature build seam Because of sunshine and the temperature difference of day and night, the temperature difference between indoor and outdoor temperature, and the temperature difference of the season, it can cause the heat and shrinkage of the material. When the constraint conditions the temperature deformation caused by temperature stress is big enough, the wall can produce temperature crack, such as frame beam under the block at the top of the horizontal crack, Windows and doors hole Angle cracks and so on, as well as the large non-stretch metope. Two, the shrinkage crack For air reinforced concrete blocks, the material can produce large shrinkage deformation as the water content decreases. The characteristic of dry shrinkage is that early development is faster. If you place a block in 28d, you can achieve about 50% dry shrinkage. This kind of deformation is spread widely on the wall, the quantity is more, the crack degree is also more serious. Such as the vertical cracks in the wall, the terraced cracks, the slanting cracks in the windowsill, and the cracks between the frame column and the filling wall. However, the various kinds of cracks formed in this form are usually formed by the combination of temperature stress deformation and drying shrinkage. The factors that cause cracks in the design The non-bearing masonry wall is a post-filled containment structure tha