自密实混凝土泵送压力变化规律分析

Analysis on the Changes of Pumping Pressure of Self-compacting Concrete in Pipes

采用水平盘管模拟自密实混凝土超高层泵送过程,监测泵送管道沿程压力,探索C70自密实混凝土在超长泵送管道中的全过程压力变化规律,掌握不同的泵送介质、泵送排量、管道类型及脉冲压力传递等变化规律。研究结果表明:排量一定时泵送压力与泵送介质的塑性黏度呈正比关系;介质一定时泵送压力随泵送排量增大而增大;脉冲压力传递与泵送距离无关;水平管道的压力损失小于弯头处的压力损失;越靠近泵管入口,压力损失越大。现有泵送管道内压力损失计算公式已不适用于自密实混凝土。

The high-rising building pumping process of self-compacting concrete was simulated with a horizontal pipeline coil. The pressure change along pipeline was monitored to explore the pressure change of C70 self-compacting concrete during the super-long distance pumping. The influence of pumped material,delivery capacity,pipe type and pulse pressure transfer were investigated. The results show that the pumping pressure is proportional to the plastic viscosity of materials when the delivery capacity is constant and increases with the delivery capacity for a determined material. The pulse pressure transfer is independent of the pumping distance. The pressure loss in horizontal pipeline is less than that in elbow.The closer to the inlet of pipeline,the larger pressure loss is. The existing empirical equation of pressure loss in the pipeline is not suitable for self-compacting concrete.