Water quality implications of culvert repair options : cementitious and polyurea spray-on liners.

Details

• Creators:
  Donaldson, Bridget M. ; Whelton, Andrew J.
• Corporate Creators:
  Virginia Center for Transportation Innovation and Research
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Culverts
  • Cured in place pipe
  • Trenchless technology
  • Environmental impact analysis
  • Water quality
  • Aquatic life
  • Sprays (Materials)
  • Leaching
  • Immersion tests
  • Laboratory tests
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• Publication/ Report Number:
  FHWA/VCTIR 13-R3
• Resource Type:
  Tech Report
• Geographical Coverage:
  Virginia
• Edition:
  Final report.
• Corporate Publisher:
  Virginia Center for Transportation Innovation and Research
• Abstract:
  Many commonly used culvert rehabilitation technologies entail the use of a resin or coating that cures to form a rigid ; liner within the damaged culvert. However, the potential environmental impacts of leaching or release of contaminants during ; normal installation practices have not been well studied. Evaluations of previous culvert repair operations by the Virginia ; Department of Transportation (VDOT) were conducted for conventional (styrene-based) cured-in-place pipe and fold and form ; repair technologies. The study reported herein included an evaluation of two additional technologies available for use by VDOT: ; a polymer-enhanced cement mortar (or cementitious) spray-on liner and a polyurea spray-on liner. ; To evaluate the potential for these lining technologies to impact water quality, installations were monitored up to 49 ; days. Three water quality tests were conducted for each installation, and water samples were analyzed for water quality ; indicators and constituents listed in material safety data sheets. Tests included a water flow simulation with low dilution ; potential; an immersion test to simulate a standing water scenario; and a laboratory leaching test. Results were then compared ; against established regulatory standards and published toxicity criteria for aquatic species. ; For the cementitious spray-on liner evaluated, pH and alkalinity exceeded specified Virginia water standards in ; laboratory tests but pH and other evaluated compounds were within the acceptable range in water flow and immersion tests. For ; the polyurea spray-on liner evaluated, elevated water quality indicators (i.e., biochemical oxygen demand, chemical oxygen ; demand, total organic carbon, and total nitrogen) in laboratory tests suggested that contaminants were released from the polyurea ; liner, particularly during its initial contact with water, but water quality impacts were not detected in the other tests. Water flow, ; dilution, and volatilization appear to play an important role in reducing water quality impacts from contaminant leaching. ; The study recommends that VDOT specifications include protective controls for spray-on liners to prevent exceeding ; water quality standards or toxicity thresholds for aquatic species in receiving waters with low flows and little dilution potential.
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• Format:
  PDF
• Funding:
  98482
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25491/dot_25491_DS1.pdf
• File Type:
  [PDF - 476.52 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:9bc3eedcb67db9d7dddf3e7feef857e823a0d98cc6c3bfaf7311577ac80ab4293e793a5860673590108661d2f9fe911718d176f972a1f77574f83a9b259f56d4