聚合物改性沥青低温性能指标研究

Low Temperature Performance Index of Polymer Modified Asphalt

研究了4类聚合物改性沥青的常规性能与低温流变性能,并对其混合料进行了低温弯曲试验.结合灰色关联理论,对聚合物改性沥青的多个低温性能指标与混合料低温弯曲试验结果进行了相关性分析.结果表明:聚合物改性沥青的玻璃态转变温度、低温流变性能指标、低温测力延度试验的黏韧性指标与沥青混合料低温弯曲试验结果均具有良好的关联性,其中的玻璃态转变温度关联度最高,能较好地反映聚合物改性沥青的低温性能,其次是低温流变指标和黏韧性指标.

The conventional performance and low temperature rheological properties of four types of polymer modified asphalt binders were tested. In addition, the low temperature bending test of mixtures was also carried out. Combined with grey correlational theory, the correlation between low temperature indexes of asphalt binder and performance of asphalt mixture was analyzed. For these kinds of modified asphalt binder, the results show that the glass transfer temperature, rheological index and toughness resulted from low temperature force-ductility test of polymer modified asphalt have good correlation with the low temperature performance of asphalt mixture. Glass transfer temperature has the highest relevance, which can better reflect the low temperature performance of polymer modified asphalt, followed by low temperature rheological index and asphalt toughness.