Laboratory Testing of Paving Mixes-Dynamic Material Functions and Wheel Tracking Tests

J. Zak ； J. Stastna ； L. Zanzotto ； D. MacLeod

《International Journal of Pavement Research and Technology》 6卷3期 (2013/05) Pp. 147-154

https://doi.org/10.6135/ijprt.org.tw/2013.6(3).147

並列摘要

Five asphalt paving mixes prepared with different asphalt binders (one conventional, two oxidized, and two modified by styrene-butadien-styrene copolymer, 2% and 4% by weight) were studied in small amplitude oscillation and wheel tracking tests. The main focus of the study was to investigate these materials at a relatively high service temperature (58°C). From dynamic testing at temperatures ranging from -10°C to 80°C, the master curves of dynamic material functions (storage modulus, loss modulus, and loss tangent) were prepared at a reference temperature of 58°C. The relaxation and retardation spectra were calculated for all the materials, and the corresponding (compressive) compliance, D(t) (linear viscoelastic), was also determined from the retardation spectrum. It was shown that D(t) can be effectively approximated from the magnitude of the complex compliance by transforming the domain of the reduced frequencies to the time domain. From the wheel tracking test performed at 58°C, the accumulated compliance function (deformations larger than in the dynamic tests) was calculated and appended to the linear viscoelastic D(t). A simple model of the compounded compliance with stretched time (developed earlier) was used. It was shown that, in most of the tested materials, the information from the dynamic testing seemed to be poorly correlated with the trend of the compliance obtained from the wheel tracking data when the compounded compliance was plotted. On the other hand, when the model of compliance was fitted only to a subset of the linear viscoelastic data (the subset generated by points defining the peak of the loss tensile modulus), the accumulated compliance from the wheel tracking test can be estimated by the same model.

並列關鍵字

Compliance function ； Dynamic testing ； Paving mix ； Wheel tracking

參考文獻

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