FRP Lining Adhering to Secondary concrete of Shield Tunnel

Abstract

Recently, concrete corrosion at sewage treatment facilities has caused trouble in various fields. Specially, the situation at the facility which treats industrial drains is serious and necessary to take some urgent countermeasure.
At Ibo River Regional Sewage Public Works, Hyogo Pref., which is planned to treat sewage from tanners, it has been necessary to protect unused underground drainage (I. D. 1, 650 mm) from corrosion which was drilled by the shield method and successively lined by concrete. For this purpose, suitable corrosion resistant lining materials were selected, FRP test-lining was carried out, and finally fullscale FRP lining was completed. This report also describes the cause of partial peeling of the FRP coating which occurred at the beginning of full-scale FRP lining as a countermeasure to overcome its trouble and further the cross sectional difference of concrete property of concrete drainage.