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随着高层建筑与大型设备基础日益增多,大体积混凝土的应用也日益广泛。大体积混凝土断面大、水泥用量多,水泥水化后释放的水化热会使混凝土产生较大的温度应力和收缩应力,导致混凝土产生表面裂缝和贯穿性裂缝,影响结构的整体性、耐久性和防水抗渗性。因此在大体积混凝土浇筑前应进行裂缝控制计算,估算混凝土浇筑后可能产生的最大水化热温升值、温度差和温度收缩应力,以便在施工中采取有效的技术措施。
With the increasing number of high-rise buildings and large-scale equipment, the application of mass concrete is also increasingly widespread. Massive concrete has a large cross-section and large amount of cement. Hydration heat released after cement hydration will cause large temperature stress and shrinkage stress of concrete, resulting in surface cracks and penetrating cracks in concrete, affecting the structural integrity and durability And waterproof impermeability. Therefore, before the mass concrete pouring should be calculated to calculate the crack control, concrete pouring may estimate the maximum heat of hydration temperature rise, temperature difference and temperature shrinkage stress in order to take effective technical measures in the construction.