纳米改性乙烯-乙酸乙烯酯对丁苯橡胶改性沥青性能的影响  

Effect of nano-modified ethylene-vinyl acetate on performance of styrene-butadiene rubber modified asphalts

作　　者：韩卫娜 凡明杰 HAN Wei-na;FAN Ming-jie(Yellow River Engineering Consulting Co Ltd,Zhengzhou 450000,China)

机构地区：[1]黄河勘测规划设计研究院有限公司,郑州450000

出　　处：《合成橡胶工业》2022年第4期314-319,共6页China Synthetic Rubber Industry

摘　　要：为了考察纳米改性乙烯-乙酸乙烯酯(MEVA)对丁苯橡胶(SBR)改性沥青物理和流变性能的影响,采用共混法制备了MEVA掺配比例不同的MEVA/SBR复合改性沥青。测试了复合改性沥青的基本物理性能,采用动态剪切流变仪的温度扫描分析了流变特征,通过多重应力蠕变恢复试验及弯曲梁流变仪分别评价了高低温性能及所能承受的交通荷载等级。结果表明,MEVA的加入可有效改善SBR改性沥青的物理及流变性能,且随掺量增加改性效果逐渐增强。综合考虑高低温性能,推荐MEVA掺量为质量分数5%。与SBR改性沥青相比,最佳掺配比例下的MEVA/SBR复合改性沥青的高温等级提高了18℃,并可在76℃下承受“S”等级的交通荷载,且其低温性能可满足-28℃的使用温度等级要求。In order to investigate the effect of nano-modified ethylene-vinyl acetate(MEVA)on physical and rheological properties of styrene-butadiene rubber(SBR)modified asphalt,MEVA/SBR composites modified asphalt with different proportion of MEVA were prepared by blending method.The basic physical properties of the composite modified asphalt were tested,and rheological characteristics was analyzed by using temperature scanning of dynamic shear rheometer.The high and low temperature performance and traffic load grade that the composite modified asphalt could withstand were evaluated by multiple stress creep recovery test and ben-ding beam rheometer.The results showed that the addition of MEVA could effectively improve the physical and rheological properties of SBR modified asphalt,and the modification effect gradually increased with the increase of MEVA amount.Consi-dering high and low temperature properties,the re-commended amount of MEVA was mass fraction of 5%.Compared with SBR modified asphalt,the high temperature grade of MEVA/SBR composite modified asphalt with the best mixing ratio was increased by 18℃,and it could bear traffic load of“S”grade at 76℃,and its low temperature performance could meet the service temperature grade requirements of-28℃.

关 键 词：丁苯橡胶 改性乙烯-乙酸乙烯酯 复合改性沥青 高温抗变形能力 低温性能 

分 类 号：U416.217[交通运输工程—道路与铁道工程]