Test and Analysis of Crystallization State and Rheological Performance of Sulfur Asphalt
To overcome pavement rutting disease and reduce the use of petroleum asphalt,sulfur is used to modify the virgin asphalt.Four kinds of sulfur extended asphalt were prepared with different sulfur contents(10%,20%,30%and 40%),and cured for different days(7,14 and 30 d)at room temperature.The crystal morphology,penetration,softening point and rheological properties of different sulfur asphalts were evaluated respectively.It was found that the crystallization of sulfur in the sulfur asphalt can significantly improve the rutting resistance at high temperature.Specifically,sulfur can significantly improve the softening point,complex shear modulus and rutting factor of virgin asphalt.Additionally,low sulfur content(10%)has slight effect on the rheological properties of base asphalt,therefore it is recommended to prepare sulfur asphalt with high sulfur content(no less than 20%).
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