Study on self-healing performance of asphalt based on rheological properties.

In order to analyze the rationality of evaluation indexes HI₁, HI₂, HI₃, HI₄ and HI₅ based on rheological properties for self-healing performance of asphalt, DSR (dynamic shear rheometer) is used to test the relationship between the complex modulus and loading times of virgin asphalt, SBS modified asphalt and rubber modified asphalt. Based on four-point bending fatigue test, the fatigue-self-healing properties of virgin asphalt mixture, SBS modified asphalt mixture and rubber modified asphalt mixture are studied. The results demonstrate that evaluate the self-healing performance of asphalt with different indicators may obtain different results, the order of self-healing ability of virgin asphalt, SBS modified asphalt and rubber modified asphalt is inconsistent, and the evaluation result of HI5 index on self-healing ability of three asphalts is consistent with mixtures, the self-healing ability of rubber modified asphalt and SBS modified asphalt is better than virgin asphalt obviously. [ABSTRACT FROM AUTHOR]