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2020 Vol.11, Issue 1 Preview Page

General Article

Durability assessment for PSC girder member usedfor 46 years in urban area - Resistance to chloride ingress
Seungjun Kwon1
,
Seunghee Kwon2*
1Professor, Department of Civil and Environmental Engineering, Hannam University, Daejeon, South Korea
2Professor, Department of Civil and Environmental Engineering, Myongji University, Gyeonggi-do, South Korea
* Corresponding Author
31 March 2020. pp. 16-28
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Abstract

Bridge structures exposed to metropolitan cities are composed of several piers of mass concrete, girders and slabs that resist bending and shearing forces. Particularly in the case of the superstructure, the deterioration degree is evaluated differently since the design strength grade of the slabs and PSC (Pre-Stressed Concrete) girder differs, and the conditions of resisting the loads as well as localized environmental conditions differ. In this study, 60 core specimens were obtained from the PSC girder bridge used for 46 year in urban area in order to assess the compressive strength characteristics and resistance to chloride ingress (total passed charge and chloride diffusion coefficient). Engineering and durability characteristics are investigated for each location of the core specimens. In the lateral side of the slab, the average passed charge was 4164 C and the core strength was 19.1 MPa, which were 115 % of [HIGH: 4000 C] rating for steel corrosion risk and 80.0% level of the design strength. In the bottom surface of slab, the results were 5251.6 C and the 19.2 MPa, while central portion of the slab has the most satisfactory condition with 4403.3 C and 20.6 MPa. The top flange of girder has relatively sound conditions both for strength and durability with 4993.6 C and 27.2 MPa. In the web of girder, the results were the most satisfactory with 4190.1C and 23.6 MPa. The maintenance plan and assessment for bearing capacity should consider the local member properties since local environmental conditions and strength grade differ.

Keywords
compressive strength
psc-i girder
slab
passed charge
chloride diffusion
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Information
  • Publisher :Sustainable Building Research Center (ERC) Innovative Durable Building and Infrastructure Research Center
  • Publisher(Ko) :건설구조물 내구성혁신 연구센터
  • Journal Title :International Journal of Sustainable Building Technology and Urban Development
  • Volume : 11
  • No :1
  • Pages :16-28
  • Received Date : 2019-07-26
  • Accepted Date : 2020-03-21
  • DOI :https://doi.org/10.22712/susb.20200003
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