Performance of the corrugated metal pipe sliplining method using FRP pipes

Corrugated Metal Pipes (CMP) have been extensively used in culverts for decades. Currently, there is a significant growing demand for CMPs to be either replaced or rehabilitated due to their deterioration caused by corrosion. Sliplining is one of the simplest and cost-effective methods of CMP culvert rehabilitation. This paper examined the structural performance of CMP sliplined by Fibre Reinforced Polymer (FRP) composites considering the effects of host pipe and the grout infill. In this research, CMP, FRP pipe and FRP sliplined CMP were subjected to parallel plate load test (PPLT) and the load deflection behaviour and failure modes were examined. A low strength flowable mortar mix was used as the Controlled Low Strength Material (CLSM) to fill the annular space between pipes. It was observed that the core failure of the FRP pipe governs the failure of the sliplined CMP. A change in load deflection behaviour of the host pipe of sliplined CMP system was also observed with reference to the PPLT results of the FRP pipe sample itself. Further, the failure modes of the FEM and the failure modes observed in the experiments were in good agreement.