长江科学院院报 ›› 2022, Vol. 39 ›› Issue (6): 1-8.DOI: 10.11988/ckyyb.20210924

• 专家特约稿 • 上一篇    下一篇

高寒地区水工混凝土防护修复技术与应用

李珍1,2, 熊泽斌2,3   

  1. 1.长江科学院,武汉 430010;
    2.华南理工大学 材料科学与工程学院,广州 510641;
    3.长江设计集团有限公司,武汉 430010
  • 收稿日期:2021-08-31 修回日期:2022-01-29 出版日期:2022-06-01 发布日期:2022-06-30
  • 作者简介:李 珍(1971-),女,湖南湘乡人,正高级工程师,博士研究生,主要从事水工建筑物除险加固与混凝土防护新材料研发应用。E-mail:lizhen@mail.crsri.cn
  • 基金资助:
    科技部“科技助力经济2020”重点专项(2020YFF0426368);国家大坝安全工程技术研究中心开放基金(CX2019B10)

Protection and Repair Technology for Hydraulic Concrete in High and Cold Region: Research and Application

LI Zhen1,2, XIONG Ze-bin2,3   

  1. 1. Yangtze River Scientific Research Institute,Wuhan 430010,China;
    2. School of Materials Science andEngineering, South China University of Technology, Guangzhon 510641,China;
    3. Changjiang DesignGroup Co., Ltd., Wuhan 430010, China
  • Received:2021-08-31 Revised:2022-01-29 Online:2022-06-01 Published:2022-06-30

摘要: 高寒地区水工混凝土建筑物处于超大温差、极端低温、强辐射、大风、干燥等复杂条件,混凝土结构容易产生以冻融破坏为代表的劣化病害,防护修复技术是常用的劣化防治措施之一。通过有限元方法对冻融循环作用下水工建筑材料劣化过程及影响规律进行了模拟计算。结果显示,在周期变温荷载作用下,孔隙水结冰产生的冻胀应力是导致混凝土耐久性降低的主要因素。除了改善混凝土本体抗冻性外,还应采用表面防渗处理,如表面涂层防护,以控制混凝土内部含水量和冻胀应力,提高抗冻融能力。介绍了高寒地区水工建筑物防护修复材料的选择原则、种类特点和施工工艺,总结了防护修复技术在高寒地区的典型工程应用,为高寒地区水利水电工程维护提供了一定的参考借鉴,并从材料性能、配套设备、工艺拓展、标准制定4个方面进行了展望。

关键词: 水工混凝土, 冻融破坏, 防护修复, 工程应用, 高寒地区

Abstract: Due to complex conditions such as large temperature difference, extremely low temperature, strong radiation, strong wind and drying, hydraulic concrete structures in high and cold region are prone to suffer from deterioration diseases represented by freeze-thaw damage. Protection and repair technology is a commonly used preventive measure against deterioration. The degradation process and the law of influence on hydraulic building materials under freezing-thawing cycle are simulated by finite element method. Results suggest that the frost heave stress caused by freezing of pore water is the main factor leading to the decrease of its durability under cyclic varying temperature-caused load. In addition to improving the antifreeze capacity of concrete, surface anti-seepage treatment such as surface coating protection should also be taken to control the interior water content and frost heaving stress in concrete and to improve freeze-thaw resistance. Moreover, the selection principles, types and characteristics as well as construction techniques of protective repair material for hydraulic structure in high and cold region are summarized, and some typical engineering applications of protective repair technology in high and cold region are introduced for reference. The development trends of material performance, equipment, technique extension, and standard formulation are also discussed.

Key words: hydraulic concrete, freeze-thaw damage, protective repair, engineering application, high and cold region

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