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在大体积承台混凝土施工中,由于混凝土方量大,水泥水化所释放的水化热会产生较大的温度变化和收缩作用。混凝土表面和内部的散热条件不同,温度外低内高,形成温度梯度,使混凝土内部产生压应力,表面产生拉应力,表面的拉应力超过混凝土抗拉强度将引起混凝土表面开裂,内部温差过大将导致混凝土出现贯通裂缝。因此,施工中必须对大体积混凝土进行温度控制。以二道松花江特大桥为例,阐述大体积承台混凝土温控措施的实施和取得的效果。
In the construction of large-capped platform concrete, due to the large amount of concrete, hydration heat released by cement hydration will have greater temperature change and shrinkage. Concrete surface and internal cooling conditions are different, the temperature outside the low and high, the formation of temperature gradient, the concrete produces internal compressive stress, tensile stress on the surface, the surface tensile stress exceeds the tensile strength of concrete will cause the concrete surface cracking, the internal temperature difference is too large Cause concrete cracks appear through. Therefore, the construction must be mass concrete temperature control. Taking the Songhuajiang River Bridge as an example, the paper describes the implementation of the temperature control measures for large-capped platform concrete and the results obtained.