大体积混凝土温度监控的工程应用研究

The Engineering Application Research on Temperature Monitoring of Mass Concrete

为防止大体积混凝土出现因内部温度过高而导致的温度裂缝,在混凝土浇筑前通过埋设测温传感器对温度进行实时监控,掌握混凝土气表温差、表内温差、升降温速率的变化规律。结论表明:(1)混凝土内部各监测点的温度依次经历了攀升、峰值稳定、陡降、缓降四个阶段,且中部温度>底部温度>表面温度>大气温度;(2)气表温差在混凝土浇筑后的22h左右达到峰值,表内温差在混凝土浇筑后的46h左右达到峰值,此后呈阶段性下降;(3)当降温速率过快时,应采取适当的保温措施减缓其降温速率。

In order to prevent the great volume concrete appearing temperature cracks caused by high internal temperature ,temperature sensor for temperature real-time monitoring should be embedded before concrete pouring, the temperature difference between atmosphere and surface temperature. difference between surface and inner the change rule ofthe cooling rate oftemperature. Results indicate that： （1）the concrete, in turn, has experienced four stages ： the rise of temperature, the peak of the monitoring stability、 steep fall、 slow down, and the middle temperature 〉 bottom temperature 〉 surface temperature 〉 atmospheric temperature; （2）the temperature difference between atmosphere and surface in concrete pour to peak around 22 h, temperature difference between surface and inner in concrete pour to peak around 46 h, then periodically drop; （3） when the coo ling rate of concrete is too fast, appropriate heat preservation measure s should be taken to slow down the rate o fc ooling.