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发表日期:2011-06-16 摄影器材: 点击数: 投票数:
 An overpass early cracks in concrete column pier Analysis and Countermeasures 
 500ram × 80 (~ ramX4400mm the most serious cracks in column B4. Fractures mainly based on Pier 4 for the origin of its angular width and thickness of two side horizontal extension, irregular hair crack spacing loo ~ 500ram range. asked the width of cracks, two wax thin, widest 0'4mm, up to 600ram. rebound test,Beats By Dre Studio, 10d static strength of concrete 24.4MPa, accounting for the design strength of 81.1 1.1 crack investigation of cement raw materials, general Silicon 11.1 525 qualified cement boiling stability, setting time lhO7min, final setting 2h24min # 3d intensity 35.716.1MPa (compressive / flexural strength), 28d strength 53.2/8.1MPa. cement mortar strength test , obviously feeling the heat of hydration of cement re-examination of the same period than other common silicon manufacturers, mines and other varieties of cement Xinjiang high concrete specimens with the consistency of concrete by mixing cement when the loss so quickly, the slump loss of 3 ~ 5cm construction lOmin specimen with the conditions of conservation field strength of 3d design strength is 72,28 d 63,7 d only 97 1.1.2 Aggregate aggregate amount of ancient mud and other indicators are in line with requirements of sand fineness modulus of 2.7, shift in the river 'stone lO ~ 30mm grain size gravel. 1.1.3 water and tap water plus a selection of Jing-6-type drought RH Cheng Jing strong reduction, rate reduction step 8 does not reduce the amount of cement in the case, significant improve the strength of concrete. 1.2 foot work environment and construction in the summer, the ground temperature is highly selective 5l'c, concrete mixing, transport, pouring when the plate with 4 hours more than the cement final setting time,herve leger toronto, and take any measures to cool investment. Pier forming 3 to 5d form removal, plastic cover for a closed self-maintenance addition to the template and the feel from the director before and after the demolition of Pier no load, no basis for settlement. 2 crack Ji Analysis Based on a survey of raw materials, the cement used in concrete pier knot lump,herve leger sale, high heat of hydration, 3d fast-growing strength, 28d relatively low intensity,MBTシュ?ズ ??店, while, on-site observation, Pier concrete surface cracks and the color white, conservation moisture deficits cracks may 4O √ Song Lijun Liu Genghua f7 / ?, mainly due to the concrete pier unilateral cement and the cement c; A high content of mineral Qi copies, plus morning coffee with a strong dose of combustion, and the ambient temperature is high, the construction is not standardized, resulting in a temperature close early fin concrete crack. decided that for different S & P 525 silicon manufacturers of the same species and then pouring a concrete column,Beats By Dre Headphones, were analyzed. removal after cracks found no such B4 column, the apparent good quality were observed 134 columns, there are cracks in cylinder co] trend thus confirmed, B4 column indeed the early cracks of concrete shrinkage cracking temperature 3 crack crack Ji measures to meet on 3-1 for no apparent external decoration columns quality, most up-free foot of the recurrence of similar cracks in concrete work, take the following measures foot: (1) S & P 425 produced Huludao used cement mixed with silica-based high-deposited Xinjiang condensate preparation of concrete superplasticizer, pumping pouring, to ensure that the cement before the final setting of concrete pouring (2) Concrete mixing, transporting, scratch building measures taken to cool the foot, so enter mold temperature control calamity j in 30'c the following (3) ensure that the concrete after the Qi type 12h adequate moisture conservation. 3.2 patch crack detection of concrete crack width and degree of relationship (see Table 1) Table 1 crack width and crack depth of the relationship between the crack width (mm) l.. f. .2 O.25.. a [.. t0.8 crack depth (ram) 3-45-66-13H-l617l9 the protective layer of concrete overpass pier design thickness 5cm , explore the degree of crack does not penetrate the protective layer, the column will not cause structural impact in accordance with relevant provisions, considered Pier durability requirements of the existing cracks in the concrete pier to take epoxy repair methods and stand up, first, carved into the surface cracks on the width of a 2 ~ 3cm, 3 ~ 4em explore the V-type, including, washed with a commitment then, and then epoxy resin mixed with acetone, ethylene diamine, benzene and dimethyl-butyl ester transfer paste mixing to fill, after a little strength with sandpaper. 3.3 crack take effect after the construction of the pier concrete measures does not occur again due to temperature such as B4 column shrinkage cracks its strength after a comprehensive assessment of all homes statistics grid. and stand up to one year after the current column B4 Young review, investment and expansion of cracks, and the apparent quality of concrete to meet the requirements. 4 Conclusion hot summer concrete construction, concrete into the mold temperature is high, water loss and more concrete commitment of the fast, if the measures foot properly, not only affect the strength of the concrete stage of growth to be more likely to cause the temperature tuna crack Zha received, so the summer of concrete construction, should take the necessary measures to cool the Ravenna, to ensure that the concrete at a certain age period, there is sufficient moisture conservation, and Xinjiang condensate mixed with some of the best type of ink work by Jing Cheng weight 2000.N. .5 
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