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中国腐蚀与防护学报  2015, Vol. 35 Issue (6): 563-570    DOI: 10.11902/1005.4537.2014.123
  研究报告 本期目录 | 过刊浏览 |
海砂混凝土建筑的耐久性提升技术及应用研究
毛江鸿1,金伟良1,2(),张华2,许晨2,夏晋2
1. 浙江大学宁波理工学院 宁波 315100
2. 浙江大学结构工程研究所 杭州 310058
Technology for Enhancing Durability of Structures of Sea-sand Concrete and Its Application
Jianghong MAO1,Weiliang JIN1,2(),Hua ZHANG2,Chen XU2,Jin XIA2
1. Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
2. Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China
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摘要: 

对海砂海水浇筑的钢筋混凝土板进行了双向电渗实验。结果表明,位于电解液保持装置外侧12.0 cm处的钢筋周围均有Cl-排出和阻锈剂迁入。提出了依据电通量等效原则,通过混凝土实测及安全电压,计算工程应用所需的电流密度和通电时长。最后,对海砂混凝土建筑进行了双向电渗。结果表明,有机物浓度和有害Cl-浓度比值远大于1.0。室内实验和工程应用均表明,双向电渗起到了良好的除氯阻锈效果,为我国已存的大量海砂建筑的耐久性提升提供了一种有效手段。
关键词 ： 混凝土,  海砂,  双向电渗,  电化学除氯,  耐久性    
Abstract：

As one type of typical nondestructive technique of life extension, bi-directional electro-migration (BIEM) can enhance the durability of concrete structures, which suffered from chloride attack. During the BIEM process, rust-inhibitor can be migrated inward to the surface of steel bar while the chloride can be extracted out of the concrete cover. This paper applied the BIEM technique to reinforced concrete slabs poured with sea sand and seawater. The results showed that the migration of rust-inhibitor and the extraction of chloride could be realized for the reinforcing bars located within a range of 12 cm from the lateral side of an electrolyte maintaining device. In accordance with the electron flux equivalent principle, the needed time and current density for realizing the practical engineering applications could be calculated from the measured voltage and safety voltage of concrete. A trial application of BIEM to several engineering concrete structures with sea sand proved that the ratio of organics content to the chloride concentration was far above 1.0. Consequently, both of the laboratory experiment and the engineering applicant indicated that BIEM technique could play an excellent role in chloride extraction and rust resistance, thus could act as an effective method for enhancing the durability of the existed sea sand containing structures.
Key words： concrete    sea sand    bi-directional electro-migration rehabilitation    electro-chemical chloride removal    durability
    
基金资助:国家自然科学基金重大国际合作项目 (50920105806),国家自然科学基金项目 (51408544和51408534),浙江省自然科学基金项目 (LQ14E080007),宁波市科技服务业示范项目 (2014F10016)及宁波市科技创新团队项目 (2011B81005) 资助
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毛江鸿
金伟良
张华
许晨
夏晋

引用本文:

毛江鸿,金伟良,张华,许晨,夏晋. 海砂混凝土建筑的耐久性提升技术及应用研究[J]. 中国腐蚀与防护学报, 2015, 35(6): 563-570.
Jianghong MAO, Weiliang JIN, Hua ZHANG, Chen XU, Jin XIA. Technology for Enhancing Durability of Structures of Sea-sand Concrete and Its Application. Journal of Chinese Society for Corrosion and protection, 2015, 35(6): 563-570.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.123      或      https://www.jcscp.org/CN/Y2015/V35/I6/563

图1  双向电渗技术原理图
图2  双向电渗室内实验布置
Plate
number		 Device
number		 Steel bar number Section
area / m2
Main bar Stirrup
I 1 6 3 0.18
2 6 3 0.18
3 5 3 0.16
II 1 5 3 0.16
2 5 3 0.16
3 5 4 0.17
表1  室内实验双向电渗控制参数设计
图3  电解液中Cl-浓度检测曲线 (方法I)
图4  混凝土电阻检测曲线 (方法II)
图5  双向电渗效果评估取样点分布图
图6  装置内部Cl-分布图
图7  装置外侧Cl-分布图
Position of
sampling point		 Inhibitors concentration Chloride concentration Ratio
(N/Cl-)
% mol/g % mol/g
Right 2.5 cm 0.016 2.770×10-6 0.013 3.662×10-6 0.76
Right 5.0 cm 0.013 2.395×10-6 0.021 5.775×10-6 0.41
Right 7.5 cm 0.012 2.195×10-6 0.024 6.732×10-6 0.33
Right 10.0 cm 0.012 2.089×10-6 0.029 8.085×10-6 0.26
Right 12.5 cm 0.010 1.822×10-6 0.024 6.789×10-6 0.27
Inside device 0.025 4.499×10-6 0.013 3.549×10-6 1.27
Left 2.5 cm 0.025 4.475×10-6 0.012 3.408×10-6 1.31
Left 10.0 cm 0.008 1.512×10-6 0.025 7.155×10-6 0.21
Left 12.5 cm 0.016 2.786×10-6 0.031 8.732×10-6 0.32
表2  双向电渗后阻锈剂迁入浓度表
Position Steel bar number Section
area / m2
Main bar Stirrup
Column-1 3 4 0.1628
Column-2 3 4 0.1628
Wall-1 4 4 0.1929
Wall-2 3 4 0.1628
Wall-3 4 4 0.1929
Wall-4 3 3 0.1447
表3  工程实际的双向电渗设计参数表
图8  双向电渗工程应用现场
图9  上柱取样点详图
Distance from concrete surface / mm Position of sample point Cl- N N/Cl-
5 Inside of device 0.03 0.21 4.44
Outside of device 0.02 0.36 11.41
10 Inside of device 0.04 0.22 3.49
Outside of device 0.06 0.32 3.38
15 Inside of device 0.03 0.25 5.28
Outside of device 0.03 0.31 6.55
20 Inside of device 0.03 0.27 5.71
Outside of device 0.03 0.37 7.82
25 Inside of device 0.03 0.21 4.44
Outside of device 0.04 0.34 5.39
30 Inside of device --- --- ---
Outside of device 0.03 0.46 9.72
表4  实际工程双向电渗后Cl-及N浓度汇总表
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