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对于大体积混凝土建筑,水泥水化热引起混凝土浇筑内部温度和温度应力剧烈变化,是导致混凝土发生裂缝的主要原因。根据我国大体积混凝土结构的施工经验,为防止产生温度裂缝,应着重在控制混凝土温升、延缓混凝土降温速率、减少混凝土收缩、提高混凝土极限拉伸值、改善约束和完善构造设计等方面采取措施,而混凝土温升的控制尤为重要,本文着重对此进行了论述。
For mass concrete buildings, cement hydration heat causes sudden changes in internal temperature and temperature stress of concrete pouring, which is the main reason that cracks occur in concrete. According to the construction experience of China’s mass concrete structure, in order to prevent temperature cracks, we should take measures such as controlling the temperature rise of concrete, slowing down the cooling rate of concrete, reducing the concrete shrinkage, increasing the ultimate tensile value of concrete, improving the restraint and improving the structural design , While the control of concrete temperature rise is particularly important, this article focuses on this discussion.