少筋超长混凝土底板无缝施工现场温度监测与分析  

IN SITU TEMPERATURE MONITORING AND ANALYSIS OF OVER-LONG LIGHTLY REINFORCED CONCRETE SLAB WITH SEAMLESS CONSTRUCTION TECHNIQUE

作　　者：李新亮 LI Xinliang(The Civil Construction Company of CCCC Fourth Co.,Ltd.,Nanjing 211100,China)

机构地区：[1]中交四公局建筑工程有限公司,南京211100

出　　处：《低温建筑技术》2020年第2期129-133,共5页Low Temperature Architecture Technology

摘　　要：为考察少筋超长混凝土底板无缝浇筑施工后的水化放热过程,得到其真实的温度场变化情况,验证和指导少筋超长混凝土底板的无缝施工设计;对哈尔滨日遗化武废弃物保管库少筋超长混凝土底板浇筑及养护期的温度变化情况进行了现场监测。监测结果表明,该混凝土底板的水化放热在1d左右迅速达到峰值,与大体积混凝土3d左右才完成放热升温过程有所不同;降温阶段降温速度约为1.5℃/d,降温速度控制较好,养护结束后板未产生温度裂缝,验证了无缝施工设计的合理性和正确性;监测得到的温度场变化全曲线可用于指导少筋超长混凝土底板的无缝施工和裂缝控制;在试验研究的基础上采用ANASYS有限元软件,对施工过程混凝土板的水化热温度场进行数值模拟分析,分析结果与试验结果整体吻合较好。This paper investigates the hydration heat release process after the seamless pouring of the small-strength ultra-long concrete floor.The seamless construction design of the small-strength ultra-long concrete floor wasverified to obtain its real temperature field change.The temperature change during the pouring and curing period of the slab with little ribs and extra-long concrete in the waste storage was monitored on site.The results show that the hydration heat of the concrete floor quickly reaches its peak in about 1 day,which is different from the process of exothermic heating that is completed in about 3 days in large volume concrete.In addition,the cooling rate during the cooling stage is about 1.5℃/day,and the cooling rate control is good.Meanwhile,no temperature cracks are generated on the slab after the curing is completed,which verifies the rationality and correctness of the seamless construction design.The full temperature field curve obtained from the monitoring can be used to guide the seamless construction and crack control of the low-reinforced and ultra-long concrete floor.Based on the experimental study,the ANASYS finite element software was used to analyze the hydration heat temperature field of the concrete slab during the construction process.The analysis results agreed well with the test results as a whole.

关 键 词：温度监测 超长混凝土板 无缝施工 水化热 

分 类 号：TU745.2[建筑科学—建筑技术科学]