| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
JIA Yanbing. RESEARCH ON CONCRETE DURABILITY OF MULTI-PILE CAP IN WIND POWER PROJECTS UNDER A FREEZE-THAW ENVIRONMENT IN THE COAST OF NORTH CHINA[J]. Marine Geology Frontiers, 2020, 36(12): 78-84. doi: 10.16028/j.1009-2722.2020.130
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RESEARCH ON CONCRETE DURABILITY OF MULTI-PILE CAP IN WIND POWER PROJECTS UNDER A FREEZE-THAW ENVIRONMENT IN THE COAST OF NORTH CHINA
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Abstract
The physical and engineering properties of concrete pile cap are known to be affected by the aggressive ocean environment and the freeze-thaw effects, which are commonly encountered in wind power projects in shallow waters in Northern China. In this research, compressive strength tests and flexural strength test have been carried out under simulated ocean conditions with the freeze-thaw cycles and sodium chloride solution immersion. In addition, rebar Pulling tests are performed to enhance the understanding of the impact on the bond strength of different grade of concrete due to the freeze-thaw cycles and chloride exposure. The degradation mechanism subject to the combined effect of freeze-thaw cycles and Chlorine ion are further studied using the ultrasonic testing technique. In the end, the paper presents finite element analyses conducted to model structural behavior of pile cap operating conditions. The study may provide references to wind power projects under similar operating environment in freeze-thaw waters in Northern China.
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Keywords:
- frost resistance /
- wind power foundation /
- ultrasonic testing /
- numerical simulation
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References
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JIA Yanbing. RESEARCH ON CONCRETE DURABILITY OF MULTI-PILE CAP IN WIND POWER PROJECTS UNDER A FREEZE-THAW ENVIRONMENT IN THE COAST OF NORTH CHINA[J]. Marine Geology Frontiers, 2020, 36(12): 78-84. doi: 10.16028/j.1009-2722.2020.130
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Figure 1.
Relationship between time and distance of specimens in sodium chloride solution after freezing and thawing
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Figure 2.
Relationship between depth of damaged layer and freeze-thaw cycle
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Figure 3.
Compressive strength-freeze thaw cycle curve
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Figure 4.
Flexural strength-freeze thaw cycle curve
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Figure 5.
Elastic modulus-freeze thaw cycle curve
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Figure 6.
Failure load-freeze thaw cycle curve
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Figure 7.
Average bond strength-freeze thaw cycle curve
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Figure 8.
Average peak displacement-freeze thaw cycle curve
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Figure 9.
Deterioration factor-freeze thaw cycle curve
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Figure 10.
Finite element model of concrete bearing platform
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Figure 11.
Maximum stress-freeze thaw cycles curve
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Figure 12.
Curve of maximum deformation-freeze thaw cycles