Short-term crack sealant performance and reducing bumps and transverse cracking in new hot mix asphalt overlays over crack sealants.

Details

• Creators:
  Shuler, Scott
• Corporate Creators:
  Colorado State University
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Asphalt pavements
  • Cracking of asphalt concrete pavements
  • Testing
  • Pavements, Asphalt--Cracking--Colorado
  • Pavements--Colorado--Testing
• Publication/ Report Number:
  CDOT-2009-9
• Resource Type:
  Tech Report
• Geographical Coverage:
  Colorado
• Edition:
  Interim Report; Sept. 2007-Sept. 2009.
• Corporate Publisher:
  Colorado. DTD Applied Research and Innovation Branch
• Abstract:
  This interim report is intended to provide preliminary information regarding the performance of crack sealants produced by three ; manufacturers during a two-year period in service in three pavements in Colorado. In addition, preliminary conclusions have been ; developed regarding the propensity of three of these sealants to contribute to bumps in new overlay hot mix asphalt. Results of ; performance evaluations made, to date, indicate that the crack sealants failed at a surprising rate after only one winter. However, ; subsequent performance surveys after twelve months and twenty-one months indicate a tendency for the sealants to heal. Routing the ; cracks prior to filling appears to provide the best performance when the filler is overbanded, and filling the cracks to within ¼ inch of ; the surface instead of flush with the surface or overbanding produced the poorest performance. ; Bumps accompanied by transverse cracking occurred over the crack sealants when a new hot mix overlay was placed after the crack ; sealants had been in service two years. The bumps and transverse cracks were exacerbated by utilizing steel rollers with vibration on ; breakdown of the hot mix asphalt overlay. The number of passes of the vibrating steel rollers further exacerbated the presence of the ; bumps and cracks. The same rollers used in static mode reduced the effect, and pneumatic rollers used for breakdown eliminated it. ; The ambient temperature and temperature of the substrate pavement during construction appears to have had little effect, as the same ; bumps and cracking occurred during vibratory breakdown after a small rain shower moistened the substrate pavement surface prior to ; the overlay hot mix asphalt placement.
  More +
• Format:
  PDF
• Funding:
  12.69
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17452/dot_17452_DS1.pdf
• File Type:
  [PDF - 1.00 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:97fe9a826af5578ebfeec6f0f894a70bbad2d9a9b4ec45343cad53bc5d84f014