摘要
重庆市郭家沱长江大桥南锚碇散索鞍长20m、宽27m、高20.8m,属于大体积混凝土结构。为控制大体积混凝土中心温度,减缓降温速率,使温度均匀变化,防止温度裂缝的产生,采用冷却措施与相变材料联合控温。经计算,拟控制大体积混凝土中心最高温度降低3℃,相变材料所需用量为22.00kg,体积用量为每立方混凝土体积的2.40%,中心降温速率为1.37℃/d,与未加入相变材料相比,降低11.04%。该文采用的冷却措施与相变材料联合控温方法可为类似工程温度裂缝控制提供参考。
The south anchor of Guojiatuo Yangtze River Bridge in Chongqing is 20 m long,27 m wide and 20.8 m high,which can be called a mass concrete structure.In order to control the central temperature of the mass concrete,slow down the cooling rate,make the temperature change evenly and prevent the generation of temperature cracks,cooling measures and phase change materials were used to control the temperature.After calculation,the maximum temperature in the center of mass concrete is planned to be reduced by 3℃,the required amount of the phase change material is 22.00 kg,the volume amount is2.40% of the volume of each cubic concrete,and the central cooling rate is 1.37℃/d,11.04% lower than that without the phase change material.The cooling measures adopted in this paper and the combined temperature control method of phase change materials can provide reference for the control of temperature cracks in similar projects.
出处
《重庆建筑》
2022年第5期51-52,61,共3页
Chongqing Architecture
基金
重庆市教委研究生联合培养基地“基于预制装配式构件生产效能提升的材料应用研究”(JDLHPYJD2019002)。
关键词
相变材料
温度场
自控温
封装管布置
phase change materials
temperature field
automatic temperature control
packaging tube arrangement
