地下室砼裂缝控制的分析（Analysis of concrete crack control of basement）.docVIP

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地下室砼裂缝控制的分析（Analysis of concrete crack control of basement）.doc

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地下室砼裂缝控制的分析（Analysis of concrete crack control of basement）

地下室砼裂缝控制的分析（Analysis of concrete crack control of basement） Abstract: combined with the engineering practice, the reasons for concrete cracking in basement are analyzed, and various treatment measures are put forward. Key words: basement accident treatment In recent years, the development and utilization of underground space is becoming more and more common. As a result of functional requirements, the basement often has a large area and large volume, which exceeds the minimum distance between the expansion joints. Basement concrete cracks caused by leakage of water is very serious, and some even affect the use of buildings, functions and safety. I. cracking: Basement side wall cracking is more, the crack width is less than 0.5mm, spacing 1 - 4m, length, some through the wall all high, the two sides of the side wall cracks less, around the central more. Cracks often appear within 60 days of concrete pouring, and as time goes by, the number of cracks increases and some cracks widen. Especially when entering the winter air temperature change. Two. Analysis of cracks: 1, the direct cause: Causes of cracks in concrete structure is more complex, there are two kinds of reasons summed up, caused by external load, and deformation due to structural bearing capacity, the other is a structure due to temperature, shrinkage and creep, caused by factors such as uneven settlement. According to statistics, in engineering practice, the cracks caused by the latter accounts for about 80-85%, and most of the cracks in the basement belong to the latter. In the concrete pouring, due to the hydration of the cement, release a lot of heat of hydration, because the concrete component surface and component section of central temperature more than 25 DEG C is caused by concrete cracks, surface temperature and air temperature components around more than 25 DEG C, it caused crack. After the concrete is poured, the temperature increases, and the initial volume of the concrete has a slight expansio