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Matt Tabor, Maryam Salehi , Ph. D., Jesus Estaba , Andrew J. Whelton , Ph.D.

Influence of Infrastructure Rehabilitation Liners on Rinse Water Quality: Polymer Enhanced Cement Mortar and Polyurea Liners. Matt Tabor, Maryam Salehi , Ph. D., Jesus Estaba , Andrew J. Whelton , Ph.D. Department of Civil Engineering University of South Alabama August 6, 2012. Overview.

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Matt Tabor, Maryam Salehi , Ph. D., Jesus Estaba , Andrew J. Whelton , Ph.D.

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  1. Influence of Infrastructure Rehabilitation Liners on Rinse Water Quality: Polymer Enhanced Cement Mortar and Polyurea Liners Matt Tabor, Maryam Salehi, Ph. D., Jesus Estaba, Andrew J. Whelton, Ph.D. Department of Civil Engineering University of South Alabama August 6, 2012

  2. Overview • Significance of stormwater infrastructure rehabilitation • Laboratory leaching testing • Objectives • Methods • Results • Conclusions, Recommendations

  3. To Avoid Expensive Open Trench Techniques Trenchless Technologies are Being Used Trenchless Technologies CIPP Polyurethane (PU) Polyurea (PEUU) PU/PEUU Blends Cement Mortar (CM) Polymer Enhanced CM (PECM) Stormwater Study Open-trench repair: Traffic, Heavy Equip. Excavation, Inconvenience Installation, Cover

  4. Polymer Enhanced Cement Mortar (PECM) Provides Structural Strength to Host Pipe Cures in 24 hr Extreme temperature resistance High early and long-term strength Low porosity Ingredients Calcium silicate cement, Crushed stone or gravel, Sand, Mineral clays, Fly ash, Crystalline silica Polymer type unspecified Crosslinked coating achieved when fully cured No Data for PECM Possibly Water Quality Impacts?

  5. Polyurea Coatings Only Require Minutes for Complete Cure and are Reportedly Economical Coating cures within minutes Thin wall thickness Cold temperature curing ability Low cost because of ingredient versatility No Data for Polyurea Possibly Water Quality Impacts? Organics?

  6. Our Goal was to Characterize the potential that PECM and PEUU alter rinse water quality Specific Objectives: • Expose newly installed lining materials to synthetic water for 30 days • Document inorganic and organic contaminant levels in those contact waters • Analyze and interpret results

  7. Methods: A Static Leaching Procedure was Applied 1 day 10 days Install Removal Testing Synthetic Water Water pH 7.1 + 0.2 Alk. 42.5 + 3.1 mg/L as CaCO3 3-day water changes, 22° C Control PEUU PECM Organic TOC, COD, UV254 Aquatic Significance TN, BOD5 Inorganic pH, Alkalinity Water Quality was Characterized

  8. Results: Water pH was Significantly Affected by both PECM and PEUU Coatings * Every 3 days old water was replaced PECM Control PEUU

  9. Water pH Changes can be Explained by Understanding Material Chemistry! PECM 14=pH + pOH PEUU Diisocyanate Resin Carbamic Acid Functional Group Diamine

  10. Results: PECM Increased Alkalinity due to the Addition of Hydroxide Ions PECM

  11. PEUU Consistently Released Organics to the Water For 30 days while PECM Released Organics for Only 6 Days PEUU

  12. COD Results Imply Organics Released from PEUU have an Oxygen Demand PEUU

  13. BOD5 Results Demonstrated that the Majority of Contaminants Released were Not Readily Consumed by Aerobic Organisms BOD5 Raw Data Control 0 PEUU 9.2 + 0.5 mg/L PECM 0

  14. Total Nitrogen was Detected in PEUU Leachate Waters After the first Three Day Exposure Period 2.8 + 0.3 mg/L of Total Nitrogen Detected Average TN naturally occurring in rivers of Virginia is between 0.21 mg/L to 0.87 mg/L of TN US EPA (2000) • Fate of Nitrogen Unknown • Biodegradation (Nitrification) • Chemical Transformation • Recalcitrant

  15. Based on Experimental Data Contaminant Concentrations Should Increase as Pipe Diameter Decreases • † Results were calculated by applying experimentally data to a 10 foot long pipe where surface area and water volume calculations were completed.

  16. Conclusions • PECM and PEUU altered water quality for 30 days • PECM raised the pH and alkalinity for 30 days and released TOC for 6 days • PEUU released organics for 30 days (COD and TOC) and nitrogen and BOD5 for 3 days • Dynamic test procedure is needed • Document water quality impacts caused by different formulations, installation procedures • Cautious approach: Rinse coatings after installation and responsibly dispose of waters

  17. Acknowledgement Ms. Laura Linn(Dauphin Island Sea Laboratory) Ms. Bridget Donaldson (Virginia Department of Transportation) Ms. Eddy Colmenarez (University of South Alabama) Dr. Kevin White (University of South Alabama) Ms. Suzanne Lindblom (Mobile Area Water and Sewer System)

  18. Matthew Tabor Department of Civil Engineering University of South Alabama mlt1002@jagmail.southalabama.edu Dr. Andrew J. Whelton Department of Civil Engineering University of South Alabama ajwhelton@usouthal.edu

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