Research on Fatigue Performance of Asphalt Mortar Based on VECD Theory
The fatigue properties of asphalt mortar are closely related to the fatigue properties of asphalt mixture.To explore the fatigue properties of asphalt mortar.Taking base asphalt,SBS-modified asphalt,and high modulus asphalt as the research objects,the uniaxial compression dynamic modulus test,and direct tensile fatigue test was carried out;the dynamic modulus ratio was calculated based on the Viscoelastic Continuous Damage(VECD)model,and the C-S fatigue characteristic curves of three kinds of asphalt mortars were established;the fatigue evaluation parameter DR was proposed,and the fatigue damage characteristics of three kinds of asphalt mortars were evaluated.The results show thatthe relative position of the C-S damage characteristic curve can evaluate the fatigue resistance of asphalt mortar.The high modulus asphalt mortar has the best anti-fatigue performance,followed by SBS-modified asphalt mortar,and the matrix asphalt mortar has the worst anti-fatigue performance.The magnitude of the fatigue evaluation parameter DR and the rate of decrease in virtual secant modulus can also evaluate the fatigue performance of asphalt mortar.And the DR value is a material constant that is independent of the strain level.The C-S curve can better describe the damage law of asphalt mortar during the fatigue test,the fatigue evaluation parameter DR can better evaluate the fatigue performance difference between different asphalt mortars.
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