外文翻譯---商品混凝土早期裂縫的成因及防治措施-展示頁
2025-05-27 10:23本頁面
【正文】 rinkage cracks After pouring the concrete is still in plastic state, as a result of surface evaporation caused by excessive cracks, this kind of crack on the surface appear more seamless, shape irregular, varying the length of width, was cracked like a depth less than 50mm, but sheet if the concrete in the structure of clay mixed with large quantities of silt are likely to be perated. The main causes of concrete after pouring about 3 ~ 4 hours is not covered by the surface, especially the flat structure in the hot or windy weather evaporation concrete surface too quickly, or be the basis for the excessive water templates, as well as the hydration of the concrete itself Higher heat causes rapid contraction of the concrete to the concrete strength at this time near zero, can not resist the deformation caused by stress cracking, and evaporation from the concrete to absorb water faster, plastic shrinkage cracks more easily, and the goods Because concrete can be pumped in order to satisfy, the mobility of the machine when the collapse of concrete and sand ratio much larger than that of ordinary concrete, coupled with the summer construction and mass concrete in the mixing retarder, so its low early strength particularly vulnerable to water loss, the formation of cracks in the surface easily. Prevention approach is the construction units in a timely manner after the pouring of 3 concrete covering the conservation and increase environmental humidity, concrete products can be pumped in to meet, and easy under the premise of the machine to minimize the collapse, the lower the rate of sand, and strictly control bone the volume of material containing clay, mixed materials, such as mixing fly ash, such as cracks in the concrete before the end of the second condensate clean light, then a timely manner or sprinkler coverage. Cracks in the general setting of plastic and plastic shrinkage cracks are nonstructural cracks in the structural properties of no significant impact. Plastic sink and sometimes there is no significant difference between contraction, intertwined with, the quality of concrete used in raw materials have a certain influence, but not decisive role. We have encountered a work sheet in the process of pouring, w
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