|Table of Contents|

Corrosion damage of bridge pile foundations under dry-wet cycles in strong salt marsh areas(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2023年06期
Page:
156-167
Research Field:
道路与铁道工程
Publishing date:
2023-12-30

Info

Title:
Corrosion damage of bridge pile foundations under dry-wet cycles in strong salt marsh areas
Author(s):
FENG Zhong-ju1 CHEN Hui-yun12 WANG Fu-chun1 HU Hai-bo3 XU Zhan-hui4 YAO Xian-hua5
Keywords:
bridge engineering strong salt marsh area corrosion damage mechanism of pile foundation indoor dry-wet cycle test corrosion resistance coefficient
PACS:
U446.1
DOI:
10.19818/j.cnki.1671-1637.2023.06.009
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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Last Update: 2023-12-30