Characterization of aggregate interlocking in hot mix asphalt by mechanistic performance tests
The interlocking of aggregate is critical during compaction. Nevertheless, few mix design specifications include any specific requirements for locking points, mainly because it is difficult to determine when interlocking happens during compaction precisely. This study's objectives were to validate the locking point concept by applying performance tests and evaluating aggregate interlocking influence on the rutting resistance and the fatigue cracking. Two types of asphalt mixture composed of limestone aggregates and PG 64–22 binder and designed at different Ndesign were used in this study. Two types of performance tests, the Flow Number and the IDEAL CT, were used to determine and confirm the locking point's definitions. Results showed that the locking point (LP)2-2-3 and LP3 definitions during Superpave gyratory compaction were the most reasonable to define the locking point based on the vertical axial strain from the Flow Number and the Cracking Tolerance Index (CTindex) from the IDEAL CT test..
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/14680629
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Supplemental Notes:
- © 2021 Informa UK Limited, trading as Taylor & Francis Group. Abstract reprinted with permission of Taylor & Francis.
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Authors:
- Polaczyk, Pawel
- Ma, Yuetan
- Xiao, Rui
- Hu, Wei
- Jiang, Xi
- Huang, Baoshan
- Publication Date: 2021-6
Language
- English
Media Info
- Media Type: Web
- Features: References;
- Pagination: pp S498-S513
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Serial:
- Road Materials and Pavement Design
- Volume: 22
- Issue Number: S1
- Publisher: Taylor & Francis
- ISSN: 1468-0629
- EISSN: 2164-7402
- Serial URL: http://www.tandfonline.com/loi/trmp20
Subject/Index Terms
- TRT Terms: Asphalt mixtures; Axial compression; Fluid dynamics; Gyratory testing machines; Hot mix asphalt; Interlocking aggregates; Mechanistic design; Performance tests; Strain (Mechanics); Superpave
- Subject Areas: Highways; Materials; Pavements;
Filing Info
- Accession Number: 01778180
- Record Type: Publication
- Files: TRIS
- Created Date: Jul 28 2021 1:49PM