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基于弯曲流变试验(BBR)并结合DSC试验测得的玻璃化转移温度,对不同掺量的多聚磷酸(PPA)改性沥青和乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)-PPA 复合改性沥青的低温性能进行了研究。用单因素方差法分析了不同温度下,PPA掺量对沥青低温性能的影响。利用荧光显微镜观察并分析了 SBS-PPA复合改性沥青的相态结构特征。结果表明：PPA的加入对基质及复合改性沥青的低温性能有所提高,且随着PPA掺量的增加,对低温抗裂性能的改善越好,但随着温度的降低,低温改善效果逐渐减小。不同温度下,PPA对基质沥青低温性能的影响程度不同,在-18~-12℃时,对基质沥青低温性能的改善较显著,而在-30~-24℃时,对基质沥青低温性能的改善不显著；对于 SBS-PPA改性沥青,不同温度下,PPA 对其低温性能的改善均不显著。SBS-PPA 改性沥青的低温抗裂性能优于PPA改性沥青,PPA的添加可以有效促使 SBS分散为细小颗粒,并在沥青中的分布变得更加均匀,使 SBS改性沥青的储存稳定性和空间网状结构得到有效改善。

Based on the bending bean rheometer test (BBR)and DSC measurement of the glass transition tempera-ture,the low temperature properties of asphalt with different dosage of poly phosphoric acid (PPA)and SBS-PPA were studied.The effect of PPA content on the performance of asphalt at low temperature was analyzed using the method of single factor variance.The phase structure characteristics of SBS-PPA composite modified asphalt were observed and analyzed by fluorescence microscope.The results shows that PPA addition can improve the low temperature performance of matrix asphalt and SBS modified asphalt,and with the increase of PPA content,low temperature anti-crack performance of bitumen is better.But with the decrease of temperature,the effect of low temperature improvement is gradually reduced.Effect degree of PPA on the properties of base asphalt at low temperature is different at different temperature.At the temperature of -1 8 -1 2 ℃,PPA has significant effects on the low temperature performance of base asphalt.At the temperature of -30 -24 ℃,PPA has no significant impact on the low temperature performance of base asphalt.While the effect of PPA on the low temperature performance of SBS-PPA modified asphalt at different temperatures is not significant.The low temperature anti-crack performance of SBS-PPA modified bitumen is better than that of PPA modified asphalt,and the addition of PPA can effectively promote the SBS to disperse into small particles and become more uniform distribution in the asphalt,so the storage stability and the space mesh structure of SBS modified asphalt can be improved effectively.