外文翻译---商品混凝土早期裂缝的成因及防治措施(编辑修改稿)

外文翻译---商品混凝土早期裂缝的成因及防治措施(编辑修改稿)内容摘要：

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, when the hot season in August, the morning of pouring concrete into the cracks began to appear at noon to the afternoon final setting we propose is not part of a second hand light, the cracks disappear (Note: Second hand light to get a good time, before the initial setting due to the role of small, clean after final setting fixed) but the final setting has most of the parts of the cracks perate the plate surface, and was like cracking the evening pouring of concrete by adjusting the ratio, doped with which to remove the sand, has not detected the crack. However, after this site using the same raw material mix and the same two plates and pouring, pouring the morning or afternoon, the emergence of cracks on the cast is basically not found. Different and the same construction of concrete cracks in the ranks of different levels, the construction technology and the environment that conditions on the nonstructural cracks in concrete play a decisive role. 3, the temperature of mass concrete cracks Hydration process of cement hydration have some heat, and most of its heat is released within three days, concrete is a poor conductor of heat, especially the large volume of concrete, res。