Volume 23 Issue 6
Dec.  2023
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FENG Zhong-ju, CHEN Hui-yun, WANG Fu-chun, HU Hai-bo, XU Zhan-hui, YAO Xian-hua. Corrosion damage of bridge pile foundations under dry-wet cycles in strong salt marsh areas[J]. Journal of Traffic and Transportation Engineering, 2023, 23(6): 156-167. doi: 10.19818/j.cnki.1671-1637.2023.06.009
Citation: FENG Zhong-ju, CHEN Hui-yun, WANG Fu-chun, HU Hai-bo, XU Zhan-hui, YAO Xian-hua. Corrosion damage of bridge pile foundations under dry-wet cycles in strong salt marsh areas[J]. Journal of Traffic and Transportation Engineering, 2023, 23(6): 156-167. doi: 10.19818/j.cnki.1671-1637.2023.06.009
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Corrosion damage of bridge pile foundations under dry-wet cycles in strong salt marsh areas

doi: 10.19818/j.cnki.1671-1637.2023.06.009
  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, Sichuan, China

  • 3.

    Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, Zhejiang, China

  • 4.

    Highway Survey and Design Institute of Qinghai Province, Xining 810008, Qinghai, China

  • 5.

    School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450045, Henan, China

Funds:

National Key Research and Development Program of China 2018YFC1504801

Science and Technology Project of Transportation Department of Qinghai Province 2014-07

Expressway Technology Project of Fujian Province 2018Y032

More Information
  • Author Bio:

    FENG Zhong-ju(1965-), male, professor, PhD, ysf@gl.gfscw.cn

    CHEN Hui-yun (1995-), female, assistant professor, PhD, Victoria_CHY@163.com

  • Received Date: 2023-06-15
  • Publish Date: 2023-12-25
    Abstract
  • To investigate the damage mechanism of concrete material of bridge pile foundations under the action of dry-wet cycles and strong salt marsh corrosion, indoor simulation tests were conducted, and the mass loss rates, relative dynamic elastic moduli, and corrosion resistance coefficients of the concretes with different material mass ratios immersed in composite salt solutions with different concentrations after dry-wet cycles were studied. The corrosion resistance micro-mechanisms of the concrete in pile bodies were investigated by using a combination of scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and chemical composition analysis. Research results indicate that the increase in concrete mass after dry-wet cycles is due to the formation of expansive crystals such as calcium aluminate and Friedel's salt in the material. The presence of chloride ions can inhibit the corrosive effect of sulfate ions on pile foundation concrete. When the composite salt solution concentration is different, after 120 dry-wet cycles, for the pile foundation concrete specimens with a mass ratio of cement, aggregate, sand, water, fly ash, water reducer, silica fume, and expansion agent as 327∶1 103∶767∶170∶87∶7∶22:44 (mass ratio Ⅲ), the relative dynamic elastic modulus is 92.7%, and the minimum corrosion resistance coefficient is 0.91. In comparison, the pile foundation concrete specimens without silica fume and expansion agent or only with silica fume have a maximum relative dynamic elastic modulus of 89.7% and a minimum corrosion resistance coefficient of 0.80. The pile foundation concrete specimens with mass ratio Ⅲ exhibit better corrosion resistance performance and have no internal cracks even when they are subjected to the expansion force, indicating that the addition of silica fume and expansion agent improves the corrosion resistance of pile foundation concrete while ensuring no crack appears in the pile foundation concrete. Obviously, the factors such as the category of corrosive ions must be comprehensively considered, and further optimization of mass ratio of pile foundation concrete material must be carried out based on the mass ratio Ⅲ in practical engineering. 6 tabs, 12 figs, 30 refs.

     

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