玄武岩纤维/多聚磷酸复合改性沥青性能研究

Study on the Performance of Basalt Fiber/Polyphosphoric Acid Composite Modified Asphalt

为同时提高基质沥青的高低温性能,制备玄武岩纤维/多聚磷酸复合改性沥青,通过三大指标测试其基本性能;借助动态剪切流变试验(DSR)研究高温性能;利用弯曲梁蠕变试验(BBR)研究低温抗裂性能。试验结果表明:PPA的加入使得沥青的高温性能得到明显提高,表现于针入度降低34.5%,软化点上升幅度为34.1%,车辙因子升高,相位角降低,但对低温性能也产生较大的不良影响;玄武岩纤维的加入,使得由PPA产生对低温性能的消极影响得到大幅度改善,相较于PPA改性沥青延度增加181.3%,蠕变劲度减小,蠕变速率m增大。因此,玄武岩纤维/多聚磷酸复合改性沥青既可以充分发挥出优异的高温稳定性,又可以提升其低温性能。

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.