橡胶/多聚磷酸复合改性沥青高低温性能研究

摘要:

为分析多聚磷酸对橡胶改性沥青的高低温性能的影响,采用动态剪切流变仪、弯曲梁蠕变劲度试验及常规试验分别对基质沥青、橡胶改性沥青、不同多聚磷酸掺量的复合改性沥青5种沥青进行温度扫描试验、多应力重复蠕变试验和软化点试验研究沥青的高温稳定性,采用弯曲蠕变劲度试验和延度试验研究沥青的低温抗裂性。结果表明,橡胶粉改性剂可以显著改善沥青的高温稳定性和低温抗裂性；多聚磷酸可以改善橡胶改性沥青的高温性能,且掺量越多,改性效果越明显；多聚磷酸对橡胶改性沥青的低温性能没有明显的影响。

Abstract:

For the analysis of phosphoric acid polymer to the influence of high and low temperature performance of rubber modified asphalt, using dynamic shear rheometer creep stiffness, bending beam test and routine test of matrix asphalt, rubber modified asphalt, different phosphate content of composite polymer modified asphalt 5 kinds of asphalt temperature scanning experiment was carried out, more repeated stress creep test and softening point test study of the high temperature stability of asphalt, The low temperature crack resistance of asphalt was studied by bending creep stiffness test and ductility test. The results show that the rubber powder modifier can significantly improve the high temperature stability and low temperature crack resistance of asphalt. Polyphosphoric acid can improve the high temperature performance of rubber-modified asphalt, and the more the dosage is, the more obvious the modification effect is. Polyphosphoric acid has no obvious effect on the low temperature performance of rubber-modified asphalt.