Validation of Time Temperature Superposition Principle for High Modulus Asphalt Concrete in the Linear Viscoelastic and Fatigue Domains

Validation of time-temperature superposition principle (TTSP) in the fatigue domain for a high modulus asphalt concrete (HMAC) is presented in this paper. All tests were performed in tension-compression under strain control mode. First, TTSP was validated in the linear viscoelastic domain. Then, fatigue tests were performed under three loading conditions, 9.2 degrees C and 5 Hz, 11.0 degrees C and 10 Hz and 12.9 degrees C and 20 Hz, which are equivalent regarding TTSP. Two fatigue protocols were adopted: continuous fatigue test (FT) and fatigue test with rest period (FTRP). For FT, three samples were tested at 180 mu m/m for each loading condition whereas for FTRP, one sample was tested at 100 mu m/m. The data were analysed by comparing the dynamic modulus evolution as a function of time or the fatigue life duration. The results showed that HMAC with fatigue damage remains thermorheologically simple (i.e., respects the TTSP) in the studied temperatures range.