摘要
文章对高速铁路预制分离式墩柱和顶帽混凝土不同季节施工期开裂风险进行了计算评估,结果表明,该结构由于里表温差引发的开裂风险系数超过了1.0,且施工时环境温度越高,风险越大。研究提出了不同工况条件下差异化的保温养护与降低混凝土入模温度控制措施,并成功应用于京雄高铁工程,关于混凝土温度历程的监测结果与评估结果吻合较好,应变曲线未见跳点,拆模后无裂缝,达到了控制要求。
The cracking risk of concrete with precast separate piers column and top caps in Jingxiong High-speed Railway during construction in different seasons was calculated and evaluated.The assessment results showed that the cracking risk factor caused by the temperature difference between the inside and the surface of the structure exceeds 1.0,and the higher the ambient temperature during construction,the greater the risk.The research puts forward the control measures of different thermal insulation and curing and reducing the entering mold temperature of concrete under different construction conditions,and they have been successfully applied to the JingXiong high-speed railway project.The monitoring results of the concrete temperature are in good agreement with the evaluation results.There is no skipping point in the strain curve,and no cracks after detaching the mold,which meets the control requirements.
作者
彭广银
徐文
杨睿
PENG Guang-yin;XU Wen;YANG Rui(Jiangsu Senshang Engineering Design and Research Co.,Ltd,Nanjing Jiangsu 210000China;School of Materials Science and Engineering,Southeast University,Nanjing Jiangsu 211189China;Jiangsu Sobute New Materials Co.,Ltd,Nanjing Jiangsu 211103 China)
出处
《江苏建筑》
2022年第4期116-120,共5页
Jiangsu Construction
关键词
大体积混凝土
里表温差
开裂风险
保温养护
入模温度
mass concrete
temperature difference of center and surface
risk of cracking
thermal insulation maintenance
molding temperature
