Effect of Specimen Thickness on the Fracture Resistance of Hot Mix Asphalt in the Disk-Shaped Compact Tension (DCT) Configuration
In this study, the effect of specimen thickness on the fracture resistance of a dense-graded hot mix asphalt (HMA) is investigated. The fracture toughness, Kc and fracture energy, Gf in triplicate DCT specimens with width-to-thickness ratios ranging from 1.46 to 4.4 is measured at 27 °C. The coefficient of variation (COV) of Kc and Gf is calculated to determine reliability as a function of thickness. Photos of cracked specimens and 3D surface scans are employed to study how the crack path and fracture surface changed with thickness. The ASTM specifications and linear-elastic fracture mechanics theory are applied to show that Kc does not reach a plane-strain condition, Kc ≠ KIc , for the given ratios. The average Kc increases with thickness while the COV is inconsistent with thickness. The average Gf is independent of thickness but the COV decreases with thickness; thus, Gf is thickness-dependent. The crack path and fracture surface cannot be used to identify the plane-stress or plane-strain condition due to large aggregates dominating the fracture process. A method for estimating the specimen thickness required for the plane-strain condition and a method to estimate the thickness at which fracture toughness is maximized is demonstrated.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/09500618
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Supplemental Notes:
- Abstract reprinted with permission of Elsevier.
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Authors:
- Stewart, Calvin M
- Oputa, Chinedu W
- Garcia, Eduardo
- Publication Date: 2018-1-30
Language
- English
Media Info
- Media Type: Web
- Features: Figures; Photos; References; Tables;
- Pagination: pp 487-496
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Serial:
- Construction and Building Materials
- Volume: 160
- Issue Number: 0
- Publisher: Elsevier
- ISSN: 0950-0618
- Serial URL: http://www.sciencedirect.com/science/journal/09500618?sdc=1
Subject/Index Terms
- TRT Terms: Fracture properties; Hot mix asphalt; Specimens; Thickness
- Subject Areas: Highways; Materials; Pavements;
Filing Info
- Accession Number: 01664551
- Record Type: Publication
- Files: TRIS
- Created Date: Mar 28 2018 10:53AM