Geopolymer Lining of Corroded Reinforced Concrete Sanitary Sewer Pipes

摘要

Sewer renewal technologies that are currently used for the repair, replacement and/or rehabilitation of deteriorating wastewater collection systems are generally effective, but there is room for improvement of existing technologies and for the development of new technologies. Many utilities are seeking innovative rehabilitation technologies, particularly for large-diameter pipes. However, information about these emerging technologies is not always readily available. As part of the U.S. Environmental Protection Agency's Aging Water Infrastructure Program, a field demonstration program of innovative rehabilitation technologies was initiated with the purpose of: (1) gathering reliable performance and cost data for new technologies; and (2) making the capabilities of these technologies better known to the industry. This paper describes the demonstration of corrosion testing for a spray-applied geopolymer mortar during the rehabilitation of a 60-inch reinforced concrete pipe approximately 25 feet deep in Houston, TX. The demonstration section was 165 feet of severely deteriorated pipe that terminated at a wastewater treatment plant (WWTP). Unique aspects of this project included: (a) use of an innovative and emerging large-diameter structural rehabilitation technology on a severely deteriorated pipe located beneath a large open stormwater channel; (b) an independent, third-party assessment of the technology; and (c) difficult flow control issues at the WWTP.