Effect of Filler on Glass Transition of Asphalt Mastics

A study has been carried out on the glass transition of fifteen asphalt-filler mastics in three different filler types. The dynamic mechanical analysis (DMA) and differential scanning calorimetry (D SC) method were used. The results show that DMA method can measure the glass transition temperature (Tg) of asphalt-filler mastics more accurately than DSC; The glass transition temperature measured by DMA is generally higher by 20 similar to 40 degrees C than that measured by DSC; The glass transition temperature of the asphalt-filler mastics increase with the increase of the filler volume fraction, and andesite is the most sensitive; When the volume fraction of filler is greater than 0.5, the enhance capability of glass transition temperature of asphalt-filler mastics is in the order of andesite > granite > limestone, when the volume fraction of filler is smaller than 0.2, the enhance capability is in the order of granite > limestone > andesite.