Abstract
A study has been carried out of the glass transition of fifteen asphalt-filler mastics in three different filler types. The dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC) method were used. The results show that DMA method can measure asphalt Tg of asphalt-filler mastics more accurately than DSC; The glass transition temperature measured by DMA is generally higher by 20~40oC 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; while the volume fraction of filler is smaller than 0.2, the enhance capability is in the order of granite > limestone > andesite.
Highlights
Asphalt-filler mastics is an important part of asphalt mixture, and its properties influences the performance of asphalt pavement directly
The glass transition temperature of all asphalt-filler mastics have a same regularity, which is Tg increases with the increase of the filler volume fraction, and andesite is the most sensitive, which indicating that the more filler makes more interfacial layers, making the motion of asphalt molecular chain adsorbed on the surface of the filler particles become more difficult
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, which means that the more andesite filler will make the worst low-temperature performance; while the volume fraction of filler is smaller than 0.2, the enhance capability is in the order of granite > limestone > andesite, which indicates that less granite will the most decrease of glass transition temperature of asphalt-filler mastics
Summary
Asphalt-filler mastics is an important part of asphalt mixture, and its properties influences the performance of asphalt pavement directly. As the glass transition temperature (Tg) is a very important parameter of amorphous polymers [2], it should be useful in interpreting the properties of asphalts.
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