摘要
聚焦于大体积混凝土温度监测技术在上海市浦东机场四期工程大体积结构柱施工中的研发及应用。监测数据显示,各浇筑区域初始入模温度在21.2~26.0℃波动,呈现空间异质性。热工参数分析表明部分区域存在开裂风险,如A2轴线测点A201核心层温度梯度超过临界开裂阈值84.5%。监测数据不仅揭示了温度场空间分异机制,还对开裂风险进行评估,进而为温度控制关键参数优化提供依据,如通过预冷骨料降低入模温度等。同时,指出了现行温控措施的薄弱环节并给出改进建议。研究成果对保障大体积混凝土结构质量与安全、延长使用寿命具有重要意义,也为相关工程提供了实践参考与技术支撑。
Taking the Fourth Phase Project of Shanghai Pudong International Airport as a case study,this paper focused on developing and applying temperature monitoring technology for mass concrete to construct large-scale structural columns.The monitoring data showed that the initial placing temperature of each pouring area ranges between 21.2℃and 26.0℃,being spatial heterogeneity.The analysis of thermal parameters indicated that there was a cracking risk in some areas.For example,the core-surface temperature gradient of the measuring point A201 on axis A2 exceeded the critical cracking threshold by 84.5%.Based on the acquired data,this paper revealed the spatial differentiation mechanism of the temperature field.It evaluated the cracking risk and provided a basis for optimising key parameters for temperature control,including reducing the placing temperature by pre-cooling the aggregates.Moreover,the weak links between the current temperature control measures were given,and suggestions for improvement were proposed.The research results are significant for ensuring the quality and safety of mass concrete structures and extending their service life,thus providing practical references and technical support for related projects.
作者
王燕华
WANG Yanhua(Shanghai Construction Building Materials Technology Group Co.,Ltd.,Shanghai 200038,China)
出处
《上海建材》
2025年第3期70-74,共5页
Shanghai Building Materials
关键词
大体积混凝土
温度监测
温度发展
开裂控制
mass concrete
temperature monitoring
temperature development
cracking control
