The aim of this research was first to determine the master curve of dynamic modulus of the SMA mixtures with crumb rubber modifier (asphalt-rubber) and mineral fiber additive (asphalt-fiber) both unconfined and confined through the complex modulus test. Subsequently, a series of repeated sinusoidal loading tests on permanent deformation were performed for the asphalt-rubber and asphalt-fiber SMA mixtures at the same testing condition. The results of dynamic modulus master curves were used to evaluate the rutting performance between the two mixtures. The asphalt-rubber SMA mixtures contain an amount of 20 percent crumb rubber by the weight of the asphalt cement, and the asphalt-fiber SMA mixtures were sampled by blending mineral fiber with 0.4 per cent by weight of the total mixtures. Test results showed that the asphalt-rubber SMA mixtures exhibited the higher dynamic modulus master curves compared to the asphalt- fiber SMA mixtures both unconfined and confined. The repeated loading tests demonstrated the superior rutting resistance for asphalt-rubber SMA mixtures. Moreover, both SMA mixtures illustrated the validity of the principles of time-temperature superposition in the stages of viscoplastic straining during the repetitive loading tests. (a) For the covering entry of this conference, please see ITRD abstract no. 0612AR242E.
Samenvatting