A study on creep and recovery behavior of asphalt binders

作者：Saboo Nikhil^*; Kumar Praveen

来源：Construction and Building Materials, 2015, 96: 632-640.

DOI：10.1016/j.conbuildmat.2015.08.078

• Permanent deformation
• Delayed elasticity
• Asphalt binders
• Polymer

This study investigated the strain response of different asphalt binders when subjected to multiple creep and recovery cycles. Test was conducted at three altered temperatures (40, 50 and 60 degrees C) and four stress amplitudes (0.1, 3.2, 5 and 10 kPa). Burgers four element model and a Power law model were used to simulate the measured response. It was demonstrated that the modified binders outperformed the conventional binders at all the test conditions. Conventional binders were found to be highly sensitive to change in stress level and temperature. It was proved from the test results that the traditional Superpave criteria for characterizing rutting behavior of asphalt binders is not appropriate. Both the Burgers and Power model gave poor experimental fit for the recovery domain, mainly for the modified binders. The viscous parameter eta(M) of the Burgers model correlated well with the non-recoverable creep compliance (J(nR)) and R value. The modified Power model, as proposed in the study, was in good agreement with the measured creep and recovery response for all the binders. The new model parameter 'alpha' was found to be able to predict the delayed elastic response of the binders. Critical values of rim and cc were assigned corresponding to different traffic levels and suggested as a rutting measuring tool.

• 出版日期2015-10-15