摘要The asphalt mixture, AC-13C, is aged in an oven for five different periods, and then, stress relaxation tests are conducted at -5℃ on the aged samples to study the effect of aging on the relaxation of the asphalt mixtures and to build the relaxation modulus of the asphalt mixture coupled with the aging factor. The relaxation modulus curves of the asphalt mixtures with different aged degrees show that there exists equivalence between the ageing degree and relaxation time. The shift factor formula between the aging degree and the relaxation time is obtained based on free volume theory of the material viscosity through hypothesizing that there exists a linear relationship between the fractional free volume and the aging degree. The relaxation modulus master curve is nonlinear, fitted with Burgers model and general Maxwell models with different element numbers. The general Maxwell model was superior to the Burgers model in expressing the obtained relaxation modulus master curve; the more the elements are, the higher the fitting precision is. The general Maxwell model with six elements is recommended and the relaxation modulus of asphalt mixture coupled with aging factor is built according to the fitting precision and elements.
Abstract：The asphalt mixture, AC-13C, is aged in an oven for five different periods, and then, stress relaxation tests are conducted at -5℃ on the aged samples to study the effect of aging on the relaxation of the asphalt mixtures and to build the relaxation modulus of the asphalt mixture coupled with the aging factor. The relaxation modulus curves of the asphalt mixtures with different aged degrees show that there exists equivalence between the ageing degree and relaxation time. The shift factor formula between the aging degree and the relaxation time is obtained based on free volume theory of the material viscosity through hypothesizing that there exists a linear relationship between the fractional free volume and the aging degree. The relaxation modulus master curve is nonlinear, fitted with Burgers model and general Maxwell models with different element numbers. The general Maxwell model was superior to the Burgers model in expressing the obtained relaxation modulus master curve; the more the elements are, the higher the fitting precision is. The general Maxwell model with six elements is recommended and the relaxation modulus of asphalt mixture coupled with aging factor is built according to the fitting precision and elements.
田小革, 刘良骏, 于发袂, 何林. 老化沥青混合料的松弛模量模型[J]. Journal of Highway and Transportation Research and Development, 2015, 9(3): 1-6.
TIAN Xiao-ge, LIU Liang-jun, YU Fa-mei, HE Lin. Relaxation Modulus Model of Aged Asphalt Mixture. Journal of Highway and Transportation Research and Development, 2015, 9(3): 1-6.
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2015, Vol. 9 
