Abstract
Effects of particle shape on the durability (as determined from micro-Deval test) and performance [as determined from resilient modulus (), and permanent deformation (PD) tests] of unbound aggregate base (UAB) used in road structures have been evaluated in detail. Four crushed aggregates with different mineralogy (but similar angularity) were selected, and each aggregate type was mixed based on varying particle shapes (ranging from flat to equidimensional) to create dense- and open-graded gradations. The findings showed that the increase in flatness ratio affects the compaction and interlocking characteristics of the open-graded UAB materials much more than the dense-graded UAB materials. For open-graded UAB samples, the of the aggregates, regardless of the mineralogy, increased with increasing flatness ratio. The values of the dense-graded aggregates had an observed peak value at a flatness ratio of 0.6, whereas the final permanent strain during PD testing increased with increasing flatness ratio at the higher stress conditions tested. The effect of the particle shape was modeled using the MEPDG model, and the results showed that particle shape may have an effect on the overall performance.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 2 • February 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 9, 2015
Accepted: Jul 11, 2016
Published online: Sep 22, 2016
Published in print: Feb 1, 2017
Discussion open until: Feb 22, 2017
ASCE Technical Topics:
- Aggregates
- Compaction (material)
- Continuum mechanics
- Deformation (mechanics)
- Engineering materials (by type)
- Engineering mechanics
- Highway and road management
- Highway and road structures
- Highway transportation
- Infrastructure
- Material mechanics
- Material properties
- Materials characterization
- Materials engineering
- Particles
- Pavements
- Resilient modulus
- Solid mechanics
- Strain
- Structural mechanics
- Transportation engineering
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