Abstract
Ontario municipal government agencies have recently been afflicted by significant premature pavement cracking. In response, stricter specifications were developed and implemented for acceptance on contracts. All but a few proven additives are banned in order to provide a cleaner product and the asphalt is graded after extraction and recovery from the loose mix. A set of highly sensitive rheological and failure properties are used to effectively control hard to detect constituents (e.g., reclaimed asphalt, oils, waxes, other unknowns). This paper discusses the background to the specification, the development of acceptance criteria, potential moisture susceptibility issues to be monitored, and early implementation experience.
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Abbreviations
- AASHTO:
-
American Association of State Transportation and Highway Officials
- CTOD:
-
Crack Tip Opening Displacement
- DCM:
-
Dichloromethylene
- DENT:
-
Double-Edge-Notched Tension
- DSR:
-
Dynamic Shear Rheometer
- EBBR:
-
Extended bending beam rheometer protocol
- FC:
-
Friction course
- GL:
-
Grade loss
- HDBC:
-
Heavy duty binder course
- HL:
-
Hot-laid asphalt
- HMA:
-
Hot mix asphalt
- LTLG:
-
Low temperature limiting grade
- PAV:
-
Pressure Aging Vessel
- PCI:
-
Pavement condition index
- PG:
-
Performance grade
- PGAC:
-
Performance-graded asphalt cement
- RAP:
-
Reclaimed asphalt pavement
- RTFO:
-
Rolling Thin Film Oven
- SHRP:
-
Strategic Highway Research Program
- SP:
-
Superpave
- TP:
-
Test protocol
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Acknowledgements and disclaimer
This research was generously supported by the user agencies that supplied the materials used in this study. Agency staff is thanked for providing samples and contract information related to this study.
None of the sponsors necessarily concurs with, endorses, or has adopted the findings, conclusions, or recommendations either inferred or expressly stated in subject data developed.
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Moses Akentuna: Data collection, Data processing, Writing — reviewing and editing of draft and final manuscript. Haibo Ding: Data collection, Data processing. Ahmad Nawaz Khan: Data collection, Data processing, Writing — reviewing and editing of draft and final manuscript. Yiming Li: Data collection, Data processing, Writing — reviewing and editing of draft and final manuscript. Simon Hesp: Conceptualization, Supervision, Data processing, Writing of draft and final manuscript.
Declaration of interests
The authors declare the following financial interests/personal relationships which may be considered as potential competing interests. Professor Hesp receives personal consulting income from municipal, state and federal user agencies of asphalt cement. None of the other authors have anything to declare.
Peer review under responsibility of Chinese Society of Pavement Engineering.
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Akentuna, M., Ding, H., Khan, A.N. et al. Improved performance grading of asphalt cement and hot mix asphalt in Ontario, Canada. Int. J. Pavement Res. Technol. 14, 267–275 (2021). https://doi.org/10.1007/s42947-020-0059-3
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DOI: https://doi.org/10.1007/s42947-020-0059-3