外文翻譯---商品混凝土早期裂縫的成因及防治措施-wenkub
2023-05-19 10:23:58 本頁面
【正文】 f the cracks in the concrete have a very plicated and only works in this article the author encountered in the actual situation on the early cracks in the prevention of the causes and a little note. 1, aggregate concrete cracks caused by plastic setting When in the pouring of concrete, due to vibration and gravity the role of rods, sinking aggregate, cement increased, until this fall when the side to stop the concrete to harden, when such a fall by the plastic template, steel and embedded parts of inhibition ( subsidence or a template, move) the cracks will appear, which cracks appear in most of half an hour after pouring concrete to 3 hours, still in the plastic state of concrete, 2 concrete surface when the immediate disappearance of Shuiguang along the beams and plates reinforced the direction of the above occur, mainly Slump Concrete, and subsidence caused by too much. Also during the construction process of banding, if the bad template, templates, subsidence, movement of such cracks will appear. Prevention measures to meet the pumping and construction under the premise of minimizing the collapse of concrete, the construction process should be kept under observation in the displacement of the template and trace the dense poured concrete, the vibration can not leak, overvibration, and in the first Vibration 20 ~ 30mm after the interval after the resumption of the second vibration. If such cracks in the concrete before the final setting of concrete trowel surface to reuse of wood rubbed smooth hair, can heal the cracks. 2, plastic shrinkage 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 Highe
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