Comprehensive Laboratory Evaluation of Crack Resistance for an Asphalt Rubber Stress-Absorbing Membrane Interlayer (AR-SAMI)

Reflective cracking is a common distress of semi-rigid base asphalt pavements and overlay pavement projects. An rubber stress-absorbing membrane interlayer (AR-SAMI) prepared by waste tires an effective engineering solution for treating reflective cracking. This method can also reduce black pollution. However, there no unified test index crack resistance evaluation. In this work, AR-SAMIs with different air voids gradations were investigated. A small beam bending (BBT) at −10 °C 15 °C, expansion SCB (CE-SCB) test, low-temperature (LT-SCB) Overlay Test (OT) performed to evaluate the AR-SAMI comprehensively. Statistical analysis was performed. Results showed that improved as decreased. The 10-A gradation more fine aggregate excellent. coarse had better extension under condition pre-existing cracks. There are differences in evaluation results methods due various focus. BBT, CE-SCB, OT recommended Research guide or selection optimization mixture design working conditions.