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A platform for research: civil engineering, architecture and urbanism
Laboratory Evaluation of Fracture Properties of Airfield Pavement Asphalt Mixtures for Reflection Crack Modeling
The Federal Aviation Administration (FAA) is currently developing a model of reflection cracking for the thickness design of hot-mix asphalt (HMA) overlays on existing airfield concrete pavements, for eventual implementation in the standard FAA thickness design program FAARFIELD. To date, the FAA has performed six phases of full-scale tests under controlled loading conditions, using an indoor test rig at the National Airport Pavement Test Facility (NAPTF) that mimics the overlay response to temperature cycles. In addition, the FAA is monitoring a set of outdoor overlay test pavements subjected to natural climate cycles and simulated aircraft loads. In parallel with these full-scale tests, the FAA conducted advanced laboratory characterization of the fracture properties of HMA overlay materials under repeated loads. This paper presents laboratory test results for the HMA overlay specimens extracted from full-scale test pavements. Tests included the disk-shaped compact tension (DCT) test in monotonic mode, the Texas Overlay Test (OT), and non-standard tests of both notched and unnotched specimens using the Texas OT apparatus. The DCT results showed a decrease in fracture energy when the specimen temperature fell below freezing. Overlay tests on notched specimens revealed high sensitivities of fatigue strength, fracture energy, and crack propagation rate to ligament length. On unnotched specimens, fracture energy and strain energy were able to capture the effect of displacement rate on the crack growth. At 0°C, the critical energy release rate (Jc) was determined, and below this threshold, the mixture may start to lose the fracture resistance capacity.
Laboratory Evaluation of Fracture Properties of Airfield Pavement Asphalt Mixtures for Reflection Crack Modeling
The Federal Aviation Administration (FAA) is currently developing a model of reflection cracking for the thickness design of hot-mix asphalt (HMA) overlays on existing airfield concrete pavements, for eventual implementation in the standard FAA thickness design program FAARFIELD. To date, the FAA has performed six phases of full-scale tests under controlled loading conditions, using an indoor test rig at the National Airport Pavement Test Facility (NAPTF) that mimics the overlay response to temperature cycles. In addition, the FAA is monitoring a set of outdoor overlay test pavements subjected to natural climate cycles and simulated aircraft loads. In parallel with these full-scale tests, the FAA conducted advanced laboratory characterization of the fracture properties of HMA overlay materials under repeated loads. This paper presents laboratory test results for the HMA overlay specimens extracted from full-scale test pavements. Tests included the disk-shaped compact tension (DCT) test in monotonic mode, the Texas Overlay Test (OT), and non-standard tests of both notched and unnotched specimens using the Texas OT apparatus. The DCT results showed a decrease in fracture energy when the specimen temperature fell below freezing. Overlay tests on notched specimens revealed high sensitivities of fatigue strength, fracture energy, and crack propagation rate to ligament length. On unnotched specimens, fracture energy and strain energy were able to capture the effect of displacement rate on the crack growth. At 0°C, the critical energy release rate (Jc) was determined, and below this threshold, the mixture may start to lose the fracture resistance capacity.
Laboratory Evaluation of Fracture Properties of Airfield Pavement Asphalt Mixtures for Reflection Crack Modeling
Arefin, Mir Shahnewaz (author) / Ahmed, Mesbah U. (author) / Yin, Hao (author) / Ji, Richard (author) / Brill, David R. (author)
International Airfield and Highway Pavements Conference 2021 ; 2021 ; Virtual Conference
Airfield and Highway Pavements 2021 ; 145-159
2021-06-04
Conference paper
Electronic Resource
English
Asphalt Binder Properties and Airfield Pavement Cracking
| ASCE | 2017
Marshall asphalt for airfield pavement works
| TIBKAT | 1995
Airfield pavement evaluation procedures
| Engineering Index Backfile | 1965