The enhancement of performance on road tunnel lining by epoxy injection and carbon fiber reinforcement

Author(s): JinHo Choo, HongKyun Kim, TeaJong Lee, SungWoo Park, TeaGook Yoon
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 411- 412
Total Pages: 2
Language: English

Abstract: 
Two road tunnels have been inspected to provide a precise diagnosis for condition and safety by KISTEC. The typical defects of the road tunnel were cracking, leakage, spalling, corrosion, carbonation, and collapse. Among the investigated defects, cracks were mainly analyzed for shape, location and direction: longitudinal cracks, transverse cracks, inclined cracks, and round shaped cracks. Two types of cracks in tunnels with duct slabs were analyzed with numerical analysis and countermeasures were determined by field investigation and NDT. One type of crack was longitudinal cracks caused by structural reasons, the other was a network of fine cracks beneath the duct slab which was suspected to have been caused by shrinkage, difference of temperature for curing, and connection of rebar between lining and duct slab. The longitudinal cracks were repaired by epoxy injection and carbon fiber reinforcement. The quality of injection within the cracks was proved by coring with Φ43 mm core samples and the strength of attached reinforcement was verified with pull-off tests. The analyzed tension zone was rehabilitated and its stability evaluated. Also, guidelines for maintenance were suggested for the repaired and rehabilitated area.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00