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基础底板大体积砼浇筑后,由于初期水泥水化热作用而使内部温度升高,且不易散热,外部容易散热。因而产生了内外温差,引起了自约束应力,同时在降温过程中,由于砼本身的收缩,在地基约束下产生收缩应力,当应力值超过了砼抗拉强度时,就造成了砼结构裂缝。在金源大厦工程基础底板施工中,我们采用砼分段,分层浇筑施工工艺适当的砼配合比,控制砼内外温差,加强测温监控等措施,防止了温度裂缝的产生,取得了良好的技术经济效益。
After the basic floor pouring large volume of concrete, due to the initial role of hydration heat of cement internal temperature increases, and not easy to heat, external easy to heat. Resulting in a temperature difference between inside and outside, causing self-restraint stress, while in the cooling process, due to the contraction of concrete itself, under the constraints of the foundation to produce shrinkage stress, when the stress exceeds the tensile strength of concrete, resulting in concrete structure cracks. In the construction of Jinyuan Building foundation floor, we adopt concrete sub-layer, layered concrete construction process appropriate mix, control the temperature difference between inside and outside the concrete, strengthen the temperature monitoring and other measures to prevent the occurrence of temperature cracks, and achieved good Technical and economic benefits.