Performance Evaluation of an Innovative Fiber Reinforced Geopolymer Spray-Applied Mortar for Large Diameter Wastewater Main Rehabilitation in Houston, TX.

摘要

This report describes the performance evaluation of a fiber reinforced geopolymer spray-applied mortar, which has potential as a structural alternative to traditional open cut techniques used in large-diameter sewer pipes. Geopolymer is a sustainable green material that incorporates recycled industrial byproducts and has been shown to have improved chemical and physical properties compared with ordinary portland cement (OPC). GeoSprayTM, produced by Milliken Infrastructure Solution, LLC (Milliken), was used to rehabilitate a 60-in. reinforced concrete pipe (RCP) sewer main in Houston, Texas. The 25-ft depth of the pipe and other site-specific conditions precluded open cut excavation and the need for a shortened bypass time contributed to the selection of the GeoSprayTM technology. The project was completed in a two-week timeframe including four spraying passes on 160 ft of 60-in. RCP. The host pipe was severely deteriorated with corroded and exposed steel reinforcements and several locations of heavy water infiltration, which led to the product being manually spray applied by hand rather than using a sled.