Abstract
Fatigue sensitivity of four different asphalt binders and three different asphalt mixes was evaluated in the study. Binders were subjected to Linear Amplitude Sweep (LAS) test at three temperatures of 10, 20, and 30°C. Four-point beam bending test (4PBBT) was conducted on the asphalt mixes at a temperature of 20°C for strain amplitudes varying from 200 to 1000 microstrains. Tests like retained Marshall Stability and indirect tensile strength (ITS) were also carried out to judge the mix performance. Experimental studies demonstrated that elastomeric modified binder and mixes gave the best performance in fatigue. Plastomeric modification was found to be highly strain susceptible and resulted in poor fatigue performance. The fatigue life of stone mastic asphalt (SMA) was found to be almost five times higher than the dense graded mixes. For similar strain levels, the results of LAS test could be linearly correlated with the 4PBBT results.
Highlights
High stresses due to heavy vehicular loading, increase in temperature, and introduction of new axle configuration demand effective strengthening of pavements
viscosity graded (VG) 10 and VG 30 had lower fatigue lives at lower strain amplitudes
The rate of decrease in fatigue life with increase in strain level was lower than the modified binders
Summary
High stresses due to heavy vehicular loading, increase in temperature, and introduction of new axle configuration demand effective strengthening of pavements. The intermediate temperature is determined, such that |G∗| ⋅ sin δ is less than 5000 kPa [14] This stiffness based parameter, which is a development of Strategic Highway Research Program (SHRP), is measured at a fixed frequency (10 rad/sec) ensuring the strain to be below the linear viscoelastic regime of the bitumen. The test was developed based on the speculation that binder in pavements functions mostly in the linear viscoelastic range and is not likely to affect bitumen’s properties. This simple test cannot describe the actual complicated fatigue phenomena in which the binder is exposed to higher strain levels and varied frequency levels. The main objective of the study is to compare and correlate the fatigue response of different asphalt binders and mixes corresponding to different strain levels
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