The Raveling Characteristic of Porous Asphalt Mixture

In order to obtain a clearer understanding of the PAM raveling characteristic, laboratory Cantabro tests were carried out to evaluate the raveling of long term aged and unaged PAM. The Cantabro test conditions consisted of standard condition, soaked condition, low temperature condition and freeze-thaw condition. The test results indicated the Cantabro loss of PAM containing the same polymer modifier decreased with 60°C absolute viscosity of modified asphalt increasing. However, for long term aged PAM with different polymer modifier, there are no correlation between 60°C absolute viscosity and Contabro loss of PAM under four different conditions. The research found that Cantabro loss of long term aged PAM has good correlation with 5°C ductility of aged modified asphalt. In order to ensure the durability of PAM, the paper recommended Cantabro loss of samples should be tested under low temperature condition and freezing-thawing condition. Finally, the study recommend restriction range for contabro loss of unaged and long term aged PAM.