1.School of Traffic and Transportation,Shijiazhuang Tiedao University,Shijiazhuang 050043,China
2.State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China
3.School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China
4.School of Transportation,Southeast University,Nanjing 211102,China
5.School of Management,Shijiazhuang Tiedao University,Shijiazhuang 050043,China
In order to evaluate the effect of filler particles on the properties of asphalt mastic, its high-temperature rheological performance of asphalt mastic is investigated by using a modified multiple stress creep recovery (MSCR) test. The difference in Jnr values between an asphalt binder and its corresponding asphalt mastic is proposed as an index to evaluate the filler stiffening effect in asphalt mastic quantitatively. The results showed that the filler stiffening effect was highly related with the type of asphalt binder. For the SBS-modified asphalt mastic, the addition of mineral filler tends to stiffen the binder until a critical filler content where any further addition of filler would not yield any stiffening effect in the resulting asphalt mastic. It was found that the critical filler contents can be regarded as appropriate filler content for the SBS-modified mastic. It was also found that the critical filler contents can be regarded as appropriate filler content for the SBS-modified mastic and they are found to be 120% and 100% of asphalt binder by mass for the asphalt mastics made by modified binders with 3.5% and 4.0% SBS respectively. Multiple linear regression modelsfor quantifying the filler stiffening effect are derived and the effect of creep stress, SBS content and filler content on filler stiffening is discussed.
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