Abstract Manager

Corrugated metal pipe culverts have commonly been used in construction practice across North America. However, such structures are prone to deterioration. A significant number of existing corrugated metal culverts are approaching the end of their service life and are in need of rehabilitation or replacement. The traditional excavate-and-replace approach involves considerable construction costs, traffic disruptions, and potential environmental implications, so trenchless technologies are increasing in popularity as a rehabilitation strategy. One of such rehabilitation strategies, and the focus of this article, is use of spray-applied geopolymer liner for rehabilitation of a deteriorated host culvert. This rehabilitation approach has been employed in practice across North America for the last decade; however, a unified design and construction standard does not exist. There appears to be growing interest in the industry for implementation of this rehabilitation technology due to its environmental and performance benefits, and observations from field case studies have shown encouraging results. In this article, a comprehensive literature review is presented to assess the current state of knowledge in the field. Experimental testing programs, numerical studies, and documented case studies are reviewed, along with a number of the design methodologies that are currently being employed in practice. Recommendations are made for additional work in this field to help advance the state of practice towards a unified design methodology.