大体积钢筋混凝土裂缝控制——水产研究所综合楼地下室大体积混凝土裂缝控制措施

Measures to control the crack in mass steel concrete--measures to control the mass concrete crack in the synthetical building basement of Aquatic Produ cts Research Institute

大体积混凝土的截面尺寸较大,在混凝土硬化期间,水泥水化过程中所释放的水化热产生的温度变化和混凝土收缩,以及外界约束条件的共同作用而产生的温度应力和收缩应力,容易导致大体积混凝土结构出现裂缝.在施工中,通过温度、收缩应力计算,倒推混凝土入模温度,改善原材料、施工作业条件等方法,合理控制温升,延缓降温速率,可有效控制有害裂缝.

The section size of mass concrete is relatinely greater. During t he hardening of concrete and the watering of cement, temperature stress and cont ract stress which are caused by the temperature change, the concrete contracts a nd the outer limited conditions can easily lead to the concrete crack in mass co ncrete. In the construction, the harmful crack can be effectively controlled by calculating the temperature and contract stress, counter-deducing the income p attern temperature and improving raw material and building conditions.