Study on the Performance of Basalt Fiber/Polyphosphoric Acid Composite Modified Asphalt
In order to improve the high and low temperature performance of matrix asphalt at the same time,basalt fiber/polyphosphoric acid composite modified asphalt was prepared,and its basic performance was tested by three indexes.The high temperature performance was studied by means of dynamic shear rheological test(DSR).The low temperature crack resistance was studied by bending beam creep test(BBR).The test results show that the addition of PPA significantly improves the high temperature performance of asphalt,which is manifested in the decrease of penetration by 34.5%,the increase of softening point by 34.1%,the increase of rutting factor and the decrease of phase angle,but it also has a great adverse effect on the low temperature performance.The addition of basalt fiber greatly improved the negative effect of PPA on low temperature performance,and the ductility increased by 181.3%compared with PPA modified asphalt.Therefore,basalt fiber/polyphosphoric acid composite modified asphalt can not only give full play to its excellent high temperature stability,but also improve its low temperature performance.
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