Study On Different Fibres Influences On Pavement Performances Of SMA

Wood fibre and acrylic fibre and basalt mineral fibre are often used in SMA at present. However, the systematic research on the SMA performance with varied fibre for road use has not been carried worldwide. Effective method for evaluation of the performance is necessary for choosing the fibres based on its' functions in the mixture.In the paper, Dynamic Shear Rheometer(DSR)and Bending Beam Rheometer(BBR)are used to evaluate the technic performance of fiber asphalt. With the fibre added to the asphalt mixture, the performance at high temperature are enhanced but low temperature reduced.The sample of SMA-10 is taken here for rut test and static creep test and dynamic creep test and Repeated Shear Test at Constant Height (RSCH) to evaluate the performance of SMA at high temperature with different fibre. Results of these experiments are well related and give the indications on the performance of SMA. Moreover, the viscoelastic constant obtained after the cyclic compression test can be used for the pre-evaluation of rut. The mineral fibre can highly improve the performance of SMA at high temperature contrasted to other two types of fibres.After studying the influence on fatigue of SMA with different SMA through four point bending beam fatigue test, fatigue life curve and regression equation are established. Acrylic fibre is the fibres which can increase the fatigue life most.