Volume 40, Issue 1 (January 2012)
Research of Bituminous MortarFatigue Test Method Based on Dynamic Shear Rheometer
This paper presents a new test method that allows fatigue characterization on bituminous mortar by means of dynamic shear rheometer (DSR). The studied mortar is composed of bitumen, filler and fine sand at a mass ratio of 0.34:0.30:0.36. Dynamic shear rheometer instruments are widely used for bitumen testing by using parallel plate geometry. However, the parallel plate geometry is not suitable for mortar testing due to the fact that the mortar contains fine sand. To take good advantage of DSR instruments, mortar specimen and clamp system were specially designed so that mortar testing can be performed by using DSR instruments under parallel plate control mode. Due to the complex specimen geometry, finite element simulations were performed to translate the torque and deformation that the specimen was subjected into the real mortar stress and strain. An intensive experimental program indicated that the developed test method was capable to capture the shear fatigue behaviour of mortar at meso-scale by using DSR instruments.