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Although slip-lining is the most common rehabilitation technique, few research studies have been conducted on the behavior of rehabilitated reinforced concrete pipes (RCPs). Experiments were conducted on a RCP rehabilitated with a grouted corrugated steel pipe (CSP). The RCP rehabilitated by the CSP showed an increase in both load-carrying capacity and stiffness. The grout played an important role in distributing the loads when the RCP was deteriorated, whereas the load shared by the CSP represented only a small part. When the CSP was closely fitted to the RCP at the invert, the load was shared between the PCP and CSP and the CSP carried most of the load when the RCP was fully deteriorated. The slip-lined pipe acted as a “pipe within a pipe” system. A load-sharing theory was proposed in this study and provides estimates of the load-carrying capacity of the slip-lined pipes.

Experimental Investigation of an Existing RCP Rehabilitated with a Grouted Corrugated Steel Pipe