目前对多聚磷酸改性沥青和多聚磷酸改性沥青混合料低温性能所得结论不尽相同，有些结论甚至矛盾。该文采用低温延度、BBR 试验研究了多聚磷酸及其复合改性沥青的低温性能，基于低温弯曲试验、低温 SCB试验、预切口 J －积分试验和四分点加载疲劳试验研究了多聚磷酸及其复合改性沥青与沥青混合料低温抗裂性能和抗疲劳耐久性。试验结果表明，多聚磷酸对沥青混合料低温性能改善效果不明显，甚至有负面影响，可通过掺加SBR、SBS、纤维或橡胶改性沥青来改善其低温抗裂性能，多聚磷酸与 SBR 复合改性沥青对沥青混合料低温性能的改善效果优于多聚磷酸与 SBS 复合改性沥青，多聚磷酸与 SBS 复合改性沥青对沥青混合料疲劳性能的改善效果优于多聚磷酸与 SBR 复合改性沥青，将多聚磷酸与橡胶沥青或玄武岩纤维复配可提高沥青混合料的抗疲劳耐久性。仅采用沥青的低温指标并不能全面反映多聚磷酸改性沥青混合料的低温性能，断裂能密度、破坏应变作为抗弯拉强度与抵抗低温破坏变形能力的综合评价指标可综合反映多聚磷酸改性沥青混合料的低温抗裂性。%The modified asphalt of polyphosphate and polyphosphate modified asphalt mixture at low temperature performance resulting conclusions are not the same,some even contradictory conclu-sions.In this paper,the use of low-temperature ductility,BBR were studied polyphosphate and low tem-perature performance composite modified asphalt-based low-temperature bending test,low temperature SCB test,integration test and pre-cut J-quartile studied poly-loading fatigue testing its phosphate com-pound modified asphalt and asphalt mixture for cracking resistance and fatigue durability.The results show that polyphosphate of low-temperature asphalt mixture performance improvement effect is not obvi-ous,and even have a negative impact,by adding SBR,SBS,fiber or rubber modified asphalt to improve its low temperature crack resistance,polyphosphate and SBR composite modified asphalt on the effect of im-proving the low temperature performance of asphalt mixture than polyphosphate and SBS compound modi-fied asphalt,polyphosphoric acid and SBS compound modified asphalt improvement effect on asphalt mix-ture fatigue performance better than polyphosphate and SBR composite modified asphalt,the rubber as-phalt and polyphosphoric acid compound or basalt fiber can improve the asphalt mixture fatigue durabili-ty.Using only the low-temperature asphalt index does not fully reflect the polyphosphate modified asphalt low temperature performance,fracture energy density,failure strain as flexural strength and low resistance to deformation damage evaluation index may reflect a comprehensive reform polyphosphate low tempera-ture crack resistance of asphalt mixture.
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