外文翻譯---商品混凝土早期裂縫的成因及防治措施-文庫吧資料
2025-05-22 10:23本頁面
【正文】 icient of the surface plate, mass concrete walls, as well as undesirable, such as construction technology of concrete cracks caused by the problem resulting in a lot of unnecessary disputes, some cracks in the early morning, if dealt with early detection, then the structure will not affect the appearance and use. Concrete is a solid, liquid, gas, a bination of nonhomogeneous posite material, after forming as the temperature, humidity and other environmental conditions will be formed under the influence of the naked eye can not see the microcracks in the concrete position of materials and micro different structures as well as the environmental impact of different causes of 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 sh
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