By Woo Seok Chin, Jae Wook Kwon, & Dai Gil Lee
Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea

Abstract The excavation technology that conventionally used in repairing and replacing worn-out underground pipes induces traffic congestion and large amount of waste. To overcome the problems of conventional excavation technology, various trenchless (or excavation free) repair-reinforcement technologies have been developed and tried. But trenchless technologies so far developed have some drawbacks such as high cost and inconvenience of operation.

In this study, to overcome the problems of conventional trenchless technologies a repairingreinforcing process for underground pipes with glass fiber fabric polymer composites using RTM (Resin Transfer Molding) has been developed. The developed process requires shorter operation time and lower cost with smaller and simpler operating equipments than the conventional trenchless technologies.

From the investigation, it has been found that the developed repair technology with appropriate process parameters and on-line cure monitoring has many advantages over conventional methods.

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