Rutting potential of warm mix asphalt and possible misleading results due to reheating

The main objective of this study is to evaluate the rutting potential of warm mixes produced with various warm mix additives (Evotherm, Sasobit, and foamed asphalt). To achieve this objective, an experimental matrix was developed to determine the mechanical properties of warm mixes and the control mix. Laboratory performance testing includes evaluation of modulus, strength, and rutting potential using dynamic modulus test, indirect tensile (IDT) strength test, flow number (FN) test, and loaded wheel track (LWT) test. The test results show that the warm mix could have slightly greater or less rutting potential than the control mix depending on the type of warm mix additive and the recycled material used in the mix. In the laboratory tests, plant-produced mixes were compacted in the laboratory without and with reheating. It was found that the reheating process could significantly stiffen the mixture and the stiffening ratios varied from 1.2 to 2.0 depending on the performance characteristics and the type of mixture. In addition, the rutting test results show different levels of correlation with the dynamic modulus and the tensile strength, depending on the stress state in the performance test. This suggests that attention should be paid to the measured characteristics of each performance test based on the loading conditions.

Language

  • English

Media Info

  • Pagination: pp 627-636
  • Monograph Title: Bearing capacity of roads, railways and airfields: proceedings of the ninth International Conference on the Bearing Capacity of Roads, Railways and Airfields: Trondheim, Norway 25-27 June 2013. Vol 1-2

Subject/Index Terms

Filing Info

  • Accession Number: 01596560
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • ISBN: 9788232102853
  • Files: ITRD, VTI
  • Created Date: Apr 21 2016 12:30PM