PCC/AC Shoulder Joint Sealant Evaluation

Details

• Creators:
  Johnston, Dan
• Corporate Creators:
  South Dakota. Department of Transportation. Office of Research
• Subject/TRT Terms:
  Asphalt Concrete Pavements Evaluation Joint Sealers Longitudinal Joints Paved Shoulders Portland Cement Specifications
• Publication/ Report Number:
  SD90-13-F
• Resource Type:
  Tech Report
• Geographical Coverage:
  South Dakota ; United States
• Edition:
  Final Report May 1989 to December 1994
• Corporate Publisher:
  South Dakota. Department of Transportation
• Abstract:
  In July 1989 a test section of Dow Corning 890SL self-leveling silicone joint sealant was installed on Eastbound Interstate 90 near the Tilford Weigh Station. The application involved the routing and sealing of a 450-foot stretch of asphalt shoulder adjacent to the jointed plain PCC pavement. Two different vessel widths -2" and 1 ¼" -were used. Sealant depth varied between ¾" and l" with the seal recessed about½" below the pavement edge to avoid adhesion problems due to residual sealant which h.ad been previously used in the shoulder joint. A ¾" bond-breaking tape was placed on the vessel bottom to prevent three-sided adhesion of the sealant. A short section of the seal was placed without tape to determine whether use of a bond-breaker is critical. Installation of the sealant was cumbersome due to both the difficulty in routing the vessel and the relatively slow placement of the self-leveling sealant. None of the equipment used was appropriate for this application including the router head, the pump and the sealing tip. The test section was monitored twice yearly for 5 years and during this period all sections performed well with no loss of adhesion or penetration of debris through the sealant. The ultra-low modulus of the material apparently prevents stress concentration at the pavement-shoulder interface and the material is compatible with both the PCC and the AC. The minor drawback of inefficient installation could probably be addressed with appropriate modifications to existing equipment without undue difficulty. The major drawback to the use of this material for routine PCC/ AC shoulder joint sealing is the cost associated with the relatively large volume of the sealant vessel. It would take approximately 5.5 times more sealant material to seal the shoulders of one mile of PCC than is required to seal " transverse joints at a 20-foot joint spacing. This material is not recommended for shoulder joint sealing owing to its high cost. Use of smaller vessel dimensions may make its future use cost effective.
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:8a350a9b5b7e34d7ede3dcb70c9cb4894a50037d57be544b492be060362627ad16d23837af895c7131ab34b709a0cc3b0e1b652dc4aad2f38336074d3977a2f1
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/80157/dot_80157_DS1.pdf
• File Type:
  [PDF - 2.18 MB ]