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Cracks in concrete block building wall Analysis


Architectural features and improve construction efficiency and many other advantages. December 28, 1999, Shenyang Construction Committee promulgated the O0 section above, are prohibited and the use of solid clay brick design, and recommend the use of hollow clay brick, concrete hollow block, light wall board and other new wall materials. This is the city's extensive use of concrete block and brick building has laid a solid foundation. However, due to the design and construction measures unreasonable, block the production quality and the quality of construction fail to meet requirements and other factors, prevalent in the block building wall cracking problems, the people of the negative impression of block building this, we must be seriously and addressed. 1 block masonry brickwork more than the cause of cracks in concrete hollow block masonry brick masonry shear tensile strength of only 50%, 190ibm thick block wall shear capacity of thick brick walls just 240ibm 40%; another block of the coefficient of expansion and shrinkage than the large brick, masonry brickwork than Homogeneity Homogeneity poor; and because the block wall is thin, gray mortar joints of the joint surface is small, vertical slit relatively large, full-degree difference, so the stresses are concentrated, more cracks. 2 main reasons for cracks to uneven settlement of foundation wall under the action of bending shear in the main tensile stress leading to cracking too large; and Masonry, a notable feature is its high compressive strength and shear low intensity, there is a large concentrated load at the office or load changes,tods shoes outlet, will have additional internal masonry shear tensile stress, a large concentrated load in the masonry along the 45. Transmission line, when a large hole and the hole away from the load support at the close, the hole at 45. Force transmission range, the stress becomes concentrated along the hole, resulting in a hole cut at the corner formed by the principal tensile stress, causing cracks in masonry produce oblique, cantilever beam, lintel support office,vibram five fingers outlet, will be due to local pressure cracks. Block wall, slab and other parts are deformed as the temperature changes, but they are very different deformation, and mutual restraint, and often have to cut masonry, pull [Received Date] 2005--03--07 stress caused by the wall cracking. If the flat roof top of buildings prone to cracks in the wall, flat roof and wall is due to temperature and solar radiation suffered different, they are large differences between the deformation of the roof of the wall had a great level of thrust, which cause the wall cracking. During the construction process, due to on-site management, construction quality and other aspects of the imperfect, but also make masonry cracks. These aspects are: gray mortar joints are not full; block surface not clean; masonry do not strictly overlap seam on the wrong hole; assist block with large concentrations in a particular part of the wall: T-walls, doors and windows crenel etc. rows of blocks properly, wood tiles off, filled with brick puzzle and so on. And when the rain water or masonry block, do not take the necessary measures directly added new block puzzle, and get wet block instability,Beats By Dre Studio, differences between the upper and lower skin of the large masonry creep effects due to the second dry reduce the stability of the short duration of speed,Beats By Dre Headphones, so its inevitable cracks in the junction. In addition, the block's quality is mainly caused by block wall cracking is an important factor. If block size do not meet requirements, especially the highly error, difficult to adjust in the construction, the horizontal seam bending twists and turns, block uneven force, greatly weakened the masonry shear strength, the wall cracks. 3 measures to avoid cracking of the first wall block to strict quality control. Block of the quality must meet the national standards promulgated regulations to ensure the conservation of concrete block production period, so that the block is not less than age on the wall, and to strictly control block of the linear shrinkage and water absorption. Stacking blocks at the construction site facilities to increase cover to avoid rain and moisture, are not immediately used to wet the masonry masonry block, block should be dried before use. In order to facilitate the spread slurry and reduce the bond strength is not only hot and dry in the particular case, water can be a little wet. Masonry block to clear the surface of dirt to keep the walls clean; masonry should be relatively rib holes,Salvatore Ferragamo outlet, joints take the wrong puzzle, puzzle using bottom-up anti-law, increase the block shear strength. Mortar strength rating of not less than M5, preferably block special mortar; mortar joint should be smooth vertical and horizontal mortar full, to ensure strength of masonry. In short, the block as a new wall material, although the history of our country for decades, but its promotion and application, remains to be done. We only seriously sum up experience, trial and error innovation, deepen the understanding of the characteristics of block wall, and step up publicity efforts to develop comprehensive professional and technical personnel, to take effective measures in all aspects, wall cracks can be avoided. ▲
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