Journal article
Chloride concentration distributions in fatigue damaged RC beams revealed by energy-dispersive X-ray spectroscopy
Construction & building materials, Vol.234, p.117396
02/20/2020
Handle:
https://hdl.handle.net/2376/120938
Abstract
•Fatigue fractured steel shows severe corrosion and high chloride concentrations.•High chloride concentrations are observed (by EDS) around the fatigue fractured sections.•Load level 0.45 or greater than 1.2 × 106 fatigue cycles affect the Cl- concentrations in compressed concrete.•Initial fatigue loading cycles barely affect the Cl− concentrations in tensioned concrete.
In this laboratory study, the chloride concentrations at the steel-concrete interfaces of fatigue damaged RC beams were investigated by energy-dispersive X-ray spectroscopy. The beam specimens were subjected to fatigue loadings followed by 3.5 wt% NaCl solution wet-dry cycles. For the two bars in one beam, the fatigue-fractured steel exhibited severe corrosion (30%–40% corrosion area) and high chloride concentrations (0.5 wt%–0.9 wt%) in the pure flexural segment. When the load level (ratio of maximum fatigue load to ultimate static strength) reached 0.45 or after 1.2 million cycles of fatigue loading, the fatigue damage affected the chloride concentrations of compressive concrete. The increase of load level from 0.4 to 0.45 caused at least 30% increase in the chloride concentrations of tensile concrete and 6.24 times decrease in the residual fatigue life, but the initial fatigue loading cycles barely affected either of them. Results of the chloride concentrations were consistent with those of the residual fatigue life test.
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Details
- Title
- Chloride concentration distributions in fatigue damaged RC beams revealed by energy-dispersive X-ray spectroscopy
- Creators
- Jieqiong Wu - School of Transportation Science and Engineering, Beihang University, Beijing 100191, ChinaBo Diao - School of Transportation Science and Engineering, Beihang University, Beijing 100191, ChinaYuan Cao - Department of Civil & Mineral Engineering, University of Toronto, Toronto, ON M5S 1A4, CanadaJing Zhong - School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, ChinaXianming Shi - Laboratory of Corrosion Science & Electrochemical Engineering, Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-2910, USA
- Publication Details
- Construction & building materials, Vol.234, p.117396
- Academic Unit
- Civil and Environmental Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900612851901842
- Language
- English
- Resource Type
- Journal article