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Title:: Rheological properties and micro distribution of amorphous poly alpha olefin /styrene-butadiene rubber composite modified asphalt

Author(s):: WANG Li-jun; LIU Ke-yan; School of Civil Engineering, Northeast Forestry University, Haerbin 150040, China

Keywords:: styrene-butadiene rubber; amorphous poly alpha olefin; composite modified asphalt; rheological property; fluorescence microscope

摘要:: 为改善丁苯橡胶（SBR）改性沥青的高温性能，选取非晶态α-烯烃共聚物（APAO）作为改性剂，制备了高低温性能良好兼顾流变性能的APAO/SBR复合改性沥青。研究了不同掺量APAO/SBR复合改性沥青的高中低温流变性能；利用荧光电子显微镜观察了沥青中聚合物的分布状态，以从微观上反应流变性能。结果表明，APAO的加入降低了沥青的不可恢复蠕变柔量和高温区温度敏感性，提高了沥青的软化点、抗车辙因子、弹性恢复率及疲劳破坏加载次数，说明APAO提高了沥青的高温性能和耐疲劳性能。尽管APAO对沥青的低温蠕变劲度模量（S）和蠕变速率（m）都有负面影响，但APAO掺量不大于5％（质量分数，下同）时基于K（S/m）指标的低温性能仍好于苯乙烯-丁二烯-苯乙烯嵌段共聚物改性沥青。综合考虑各项性能，建议选用APAO掺量为5％，在此掺量下APAO与SBR的相容性较好。

Abstract:: In order to improve the high temperature performance of styrene-butadiene rubber （SBR）modified asphalt, amorphous poly alpha olefin （APAO） was selected as the modifier, and APAO/SBR composites modified asphalt with good high and low temperature performance and rheological properties were prepared. The high, medium and low tempe-rature rheological properties of APAO/SBR composites modified asphalts with different amount APAO were studied. Fluorescence electron microscope was used to observe the distribution of polymers in the asphalt to reflect the rheological properties from the microscopic view. The results showed that the addition of APAO reduced the non-recoverable creep compliance and temperature sensitivity of asphalt in high temperature areas, and increased the softening point, rutting resistance factor, elastic recovery rate and fatigue fai-lure loading times of asphalt, indicating that APAO increased the high temperature performance and fatigue resistance of asphalt. Although APAO had a negative effect on the low-temperature creep stiffness modulus （S） and creep rate （m） of asphalt, the amount of APAO was not more than 5% (mass fraction, the same below) based on K （S/m）. The low temperature performance of the index was still better than that of styrene-butadiene-styrene block copolymer modified asphalt. Considering all properties, it was recommen-ded to use APAO amount of 5%, under which APAO and SBR compatibility was better.