THERMO-HYDRO-IONIC TRANSPORT THROUGH AN IMMERGED TUBE TUNNEL FOR A SERVICE LIFE OF 120 YEARS

Author(s): Xiaoyun Pang, Kefei Li and Patrick Dangla
Book Title: RILEM International Symposium on Concrete Modelling - CONMOD 2014
Editor: Kefei Li, Peiyu Yan and Rongwei Yang
ISBN: 978-2-35158-139-1
e-ISBN: 978-2-35158-140-7
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 452-459
Total Pages: 8
Language: English

Abstract: This paper investigates the multi-species transport of ions in the sea water through the concrete wall of an immerged sea tunnel. The immerged tube tunnel is a part of the sea link project of Hong Kong-Zhuhai-Macau having a service life of 120 years. The wall of the tube tunnel is subject to sea water on the external side and dry (marine) air on the internal (traffic) side. A thermo-hydro-ionic model is established for the ions transport through the tunnel wall considering the mass, heat and electrical charge conservations. With the environmental data and the physical properties from the structural concrete, the ions profiles are calculated using the THI model for a service life of 120 years. Simulation results at 120 years show that (1) the extents of internal drying and external wetting of tunnel wall are well overlapped; (2) the internal drying creates a concentration peak for ions on internal surface; (3) the external leaching drives OH- ions out and the leaching depth is 1.8cm; (4) the corrosion initiation range attains 65cm but the corrosion current is below depassivation threshold.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00