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大体积混凝土工程由于结构截面大,混凝土浇注后,水泥放出大量水化热,混凝土温度升高,而且混凝土导热不良,相对散热较小。因此,混凝土内部水化热积聚不易散发,外部则散热较快,很容易由于温度的不均衡分布产生应力,故而产生温度裂缝。这里详细地介绍了大体积混凝土产生裂缝的机理,并从材料、设计、施工方面提出控制手段,引用具体实例进行论证。
Large-volume concrete works due to the structure of large cross-section, concrete pouring, the cement release a large number of hydration heat, concrete temperature increases, and poor thermal conductivity of concrete, the relative heat is smaller. Therefore, the internal hydration of concrete is not easy to dissipate the accumulation of heat, the external heat faster, it is easy due to the uneven distribution of temperature stress, resulting in temperature cracks. Here a detailed description of the mechanism of cracks in mass concrete, and from the material, design, construction control measures proposed, citing specific examples to demonstrate.