Quantifying the benefits of improved rolling of chip seals : final report, June 2008.

Details

• Creators:
  Kim, Y. Richard ; Lee, Jaejun
• Corporate Creators:
  North Carolina State University. Department of Civil, Construction, and Environmental Engineering
• Subject/TRT Terms:
  • Additives
  • Asphalt additives
  • Asphalt pavements
  • Asphalt concrete pavements
  • Testing
  • Evaluation
  • Pavements--Additives
  • Pavements, Asphalt--Additives--Evaluation
  • Pavements, Asphalt concrete--Additives--Evaluation
  • Pavements, Asphalt concrete--Performance--North Carolina--Testing
• Publication/ Report Number:
  FHWA/NC/2006-63
• Resource Type:
  Tech Report
• Geographical Coverage:
  North Carolina
• Edition:
  Final report; July 2005-June 2007.
• Corporate Publisher:
  North Carolina. Department of Transportation. Research and Analysis Group
• Abstract:
  This report presents an improvement in the rolling protocol for chip seals based on an evaluation of aggregate ; retention performance and aggregate embedment depth. The flip-over test (FOT), Vialit test, modified sand circle ; test, digital image processing technique, and the third-scale Model Mobile Loading Simulator (MMLS3) are ; employed to evaluate the effects of the various rolling parameters and to measure chip seal performance. The ; samples used to evaluate the chip seal rolling protocol were obtained directly from field construction. In order to ; determine the optimal rolling protocol, the effects of roller type, number of coverages, coverage distribution on the ; sublayers of a multiple chip seal (i.e., the split seal and triple seal), and rolling pattern are evaluated using the results ; of aggregate retention performance tests, the modified sand circle method, and the digital image process. It is found ; that two types of roller, the pneumatic tire roller and the combination roller, are recommended as the optimal rollers ; for the chip seal. In addition, it is found that the optimal number of coverages for the chip seal is three coverages. ; Moreover, the performance of the triple seal without coverage at the bottom layer does not affect the aggregate ; retention performance, although the split seal does require coverage at the bottom layer. Finally, it is found from the ; MMLS3 results that the delayed rolling time between the spreading of the aggregate and the initial rolling ; significantly affects the aggregate loss, and that the delayed rolling time is related to the aggregate moisture ; condition and the ambient temperature. Effects of different rolling patterns are investigated based on the delayed ; rolling time and roller speeds, and recommendations are developed for two- and three-roller scenarios.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17184/dot_17184_DS1.pdf
• File Type:
  [PDF - 2.26 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:14ac25f2ce558724fcf14539eed8c166368b716745307c898f6e09d09cd69a79