早强型高强度预应力水工钢筋混凝土温度裂缝控制预防措施研究
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摘要
早强型高强预应力混凝土现浇过程中经常出现温度裂缝,如不事先控制预防,长期暴露在高湿环境容易造成水工构筑物表缝扩大、外壁渗漏、钢筋腐蚀、内层缩裂、强度丧失等严重病害问题。以问题原因为导向,以控制预防为目标,全过程分析该类混凝土出现温度裂缝的各种影响因素,结合普溪河渡槽项目工法研究成果,提出养护阶段温度场变化分析数模、控制内外温差不大于15℃的全过程防裂组合措施。研究成果可为野外高空施工、高湿环境运行的渡槽工程提供借鉴和参考。
The early strength high strength prestressed hydraulic reinforced concrete is prone to temperature cracks during in-situ construction. If the cracks are not controlled and prevented in advance,long-term exposure in high humidity environment is likely to result in expansion of surface joints of hydraulic structures,outer wall leakage,steel bar corrosion,inner layer shrinkage crack,strength loss and other serious diseases. Problem cause is regarded as orientation,and control and prevention are regarded as goals,to analyze the various factors affecting concrete temperature cracks for the whole process. Research results of Puxi River aqueduct project method are combined to put forward the whole process crack prevention combined measures of the temperature field analysis mathematical model during maintenance phase and controlling the internal and external temperature difference within 15 ℃. The research results can be used for reference for aqueduct projects in high altitude construction and high humidity environment.
The early strength high strength prestressed hydraulic reinforced concrete is prone to temperature cracks during in-situ construction. If the cracks are not controlled and prevented in advance,long-term exposure in high humidity environment is likely to result in expansion of surface joints of hydraulic structures,outer wall leakage,steel bar corrosion,inner layer shrinkage crack,strength loss and other serious diseases. Problem cause is regarded as orientation,and control and prevention are regarded as goals,to analyze the various factors affecting concrete temperature cracks for the whole process. Research results of Puxi River aqueduct project method are combined to put forward the whole process crack prevention combined measures of the temperature field analysis mathematical model during maintenance phase and controlling the internal and external temperature difference within 15 ℃. The research results can be used for reference for aqueduct projects in high altitude construction and high humidity environment.
引文
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[2]张旭.如何防止混凝土温度裂缝施工技术的若干问题[J].城市建设理论研究(电子版),2012(7).
[3]骆波涛.关于混凝土温度裂缝的防治及对策[J].管理学家,2010(9):274.
[4]王铁梦.工程结构裂缝控制[M].北京:中国建筑工业出版社,1997.
[5]蒋俊峰.超大体积薄壁渡槽施工温控技术及其应用应用技术[J].科技创新与生产力,2014(2):77-80.