大体积混凝土的温度监测及控制技术措施

在大体积混凝土施工中,温度裂缝是最易产生的病害,也是施工控制的重点和难点.对于大体积混凝土的浇筑,由于混凝土体积较大,混凝土内水化热作用产生的温度升高较快,而体积大散热较慢,致使混凝土体内温度较高、混凝土表里温差较大,极易引起混凝土开裂.因此,对大体积混凝土进行温度监测并实施有效控制十分必要.通过在混凝土内布设温度传感监测系统进行温度监测,并在混凝土内埋设通水冷却系统,根据温度监测数据实时进行有效的温度控制,以降低混凝土体内温度,减少表里温差,使混凝土表里温差始终处在允许范围内,避免温度裂缝的产生,保证大体积混凝土的工程质量.

Temperature Monitoring and Control Technical Measures for Mass Concrete

In the construction of mass concrete, the temperature crack is the most easily caused disease, and is also the key point and the difficulty in the construction control. For the pouring of mass concrete, due to the larger concrete volume, the temperature produced by the hydration heat in the concrete rises faster, but the large heat dissipation of the volume is slower, which make the temperature in concrete higher, the temperature difference inside and outside of concrete larger, and the concrete easily cracking. Therefore, it is very necessary to monitor and effectively control the temperature of the mass concrete. The temperature is monitored through the temperature sensor monitoring system installed in the concrete. And the water cooling system is installed in the concrete. Based on the temperature monitoring data, the temperature is effectively controlled in time in order to reduce the temperature in the concrete and decrease the temperature difference inside and outside of the concrete, which can make the temperature difference inside and outside of the concrete always at the permitted range, can avoid the temperature cracks and ensure the engineering quality of mass concrete.