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- W576945765 abstract "Recent permanent deformation modeling research at North Carolina State University has resulted in the shift model, which is capable of expressing the permanent strain growth of asphalt concrete as a function of deviatoric stress, load time, and temperature on the basis of the time–temperature superposition and time–stress superposition principles. This paper presents an efficient calibration test protocol for the shift model as well as verification of the model. The proposed test protocol is comprised of triaxial stress sweep (TSS) tests and a reference test. The TSS test is suggested to reduce the number of tests required by applying three deviatoric stresses within one test. Each TSS test was performed at three temperatures: high (TH), intermediate (TI), and low (TL). The reference test was a triaxial repeated load permanent deformation test conducted at TH only. The shift model was calibrated for the polymer-modified dense-graded NY9.5B mix, and the calibrated model was applied successfully to predict strain growth for the composite tests at the three study temperatures and for random load tests at TH. The calibration testing procedure was optimized for the asphalt mixture performance tester. The TSS tests take approximately 2.9 h at TH and 1.5 h at TI and TL. Thus, about a day was required to complete one set of calibration tests under the proposed test protocol. Within 2 to 3 days of testing, depending on the number of replicates, the calibrated shift model is capable of predicting permanent strain growth for different temperatures, load times, and deviatoric stresses." @default.
- W576945765 created "2016-06-24" @default.
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- W576945765 date "2013-01-01" @default.
- W576945765 modified "2023-09-23" @default.
- W576945765 title "Development of Calibration Testing Protocol for Permanent Deformation Model of Asphalt Concrete (With Discussion and Closure)" @default.
- W576945765 hasPublicationYear "2013" @default.
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