混凝土小型空心砌块墙体裂缝的防治(国外英文资料).docVIP

混凝土小型空心砌块墙体裂缝的防治(国外英文资料) The prevention and control of cracks in the cracks of small and hollow concrete blocks in concrete Small hollow concrete block masonry walls cracking happens, plus the metope water penetration and poor heat insulation effect, also affect the application of wall materials. This paper induces various cracks state, analyzes its causes, and puts forward several major anti-cracking measures to discuss with you. There are many reasons for the cracks, but there are several main reasons: One is the room temperature difference stress problem. Flat roof heat preservation and heat insulation performance is poor, or roof insulating layer on the construction, the roof temperature is high, and under the roof wall temperature is low, up and down to 20 ~ 30 ℃, temperature difference is roofing system produced dramatic temperature deformation, and the roof wall light, wall of normal stress is small, weight of caused by the friction between the block is small; And in the corners of the door window will appear stress concentration phenomenon, so will produce larger binding small parts such as close to 1 ~ 2 bay at the top of the building eaves wall or in a new window Angle oblique cracks, or the bottom ring beam are on the roof and wall body horizontal crack interface. The second is the problem of shrinkage deformation of small block. General manufacturer of small block, small scale, management system is not sound, is the quality problem of the existing product intensity is low, but the wall cracking is rare in the block itself. In order to accelerate the turnover of blocks stacked sites, to increase production, block only stand for a few days in the factory is sold, the construction unit has lack of material management, make the block masonry after prone to drying shrinkage deformation. Third, the problem of construction. Masonry construction, masonry mortar plumpness, thickness, masonry to rub out requirements, issue such as difference of metope is not flat