大体积砼的蓄热养护方案.doc

大体积砼的蓄热养护

    大体积砼的养护是防止砼出现裂缝的关键工作，必须高度重视。实践证明，蓄热法养护是大体积砼养护行之有效的方法。本工程结合砼的测温，采用塑料薄膜-草袋覆盖的养护方法。
    (1) 在砼浇筑后的1～3天，由于水泥水化热作用， 砼是处在升温阶段。因此如施工期间气温较高， 则可适当推迟覆盖时间。因为过早的保温不利于热量的散发，只会提高砼内部的最高温度，增加地基对基础的约束力，对防止深层裂缝不利。所以如在气温较高的季节施工，在开始可仅采用适当覆盖遮阳，浇水润湿，以免发生龟裂。
    (2) 如砼浇筑时气温较低，则必须及时
Regenerator of conservation of mass concrete

    Conservation of mass concrete is the key to prevent the concrete cracks, we must attach great importance. Practice shows that regenerative method of mass conservation is an effective method of curing concrete. The project combines the temperature of concrete, plastic film - straw bags covering conservation methods.
    (1) Pouring 1 to 3 days after, as the role of hydration heat of cement, concrete is in a warming phase. So, if the temperature is high during the construction period, coverage may be appropriate to defer the time. Because the insulation is not conducive to premature heat, will raise the maximum temperature of concrete inside to increase the foundation on the basis of the binding, deep cracks to prevent negative. So if the higher temperature construction can begin only with adequate coverage of shade, water wet to avoid cracking.
    (2) If the temperature is lower when Pouring, you must promptly