Stray current increased by underground space extension and underground space structure service life

Title: Stray current increased by underground space extension and underground space structure service life
Author(s): Yongjing Tang, Koujun Wei
Paper category : conference
Book title: 2nd International Symposium on Service Life Design for Infrastructures
Editor(s): K. van Breugel, Guang Ye, Yong Yuan
Print-ISBN: 978-2-35158-096-7
e-ISBN: 978-2-35158-097-4
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 1139 - 1148
Total Pages: 10
Nb references: 8
Language: English

Abstract: Deterioration of reinforced concrete structures of Metro tunnel is often caused by corrosion of steel reinforcement due to stray current. Although some measures have been taken for decreasing stray current, extension construction always changes the original protection system that steel reinforcement has been welded together for mitigating stray current. However, the difference of stray current before and after extension construction of metro line is unknown.
And the challenge is how to guide the later extension construction. This paper presents preliminary experiment to simulate the Metro tunnel in the extension condition with two steel reinforcement cages weled and binded by tie wire which are given impressed current. The results provided show significant differences between the cages. The further experiment with the same steel reinforcement cages embedded in concrete will be carried on recently.

Online publication: 2011-04-20
Publication type : full_text
Public price (Euros): 0.00