基于正交试验的纳米ZnO/SEBS复合改性沥青性能  

Performance of Nano-ZnO/SEBS Composite Modified Asphalt Based on Orthogonal Test

作　　者：钟曦 苏延桂[1] 刘延金[1] 王青志 严德超 ZHONG Xi;SU Yan-gui;LIU Yan-jin;WANG Qing-zhi;YAN De-chao(School of Civil Engineering,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学土木工程学院,西宁810016

出　　处：《科学技术与工程》2023年第25期10965-10974,共10页Science Technology and Engineering

基　　金：国家自然科学基金(42161026,41801046);青海省自然科学基金(2021-ZJ-716)。

摘　　要：为使改性沥青混合料具有良好的性能,能够在一些极端环境下正常使用,选择纳米ZnO和苯乙烯-乙烯-丁二烯-苯乙烯(styrene-ethylene-butadiene-styrene,SEBS)两类改性剂复合对70号沥青进行改性。利用正交试验对复合改性沥青的制备方案进行优化,并通过布氏旋转黏度、针入度、延度、软化点和高低温流变等实验,对纳米ZnO、SEBS、纳米ZnO/SEBS改性沥青以及基质沥青的黏滞性、温度敏感性、高低温流变性能以及性能分级(performance grading,PG)进行比较分析,以此确定最优配方。试验结果表明,纳米ZnO/SEBS复合改性沥青最优制备改性剂掺量为3%纳米ZnO+5%SEBS,最优制备方案为先加SEBS后加纳米ZnO;此掺量复合改性沥青的温度敏感性显著降低,低温抗裂性能以及PG连续分级的高低温服务温度范围均有明显改善,对沥青高温性能提升最为显著。In order to make the modified asphalt mixture have good performance and can be used normally in some extreme environments,nano-ZnO and styrene-ethylene-butadiene-styrene(SEBS)were selected to modify asphalt 70.The preparation plan of composite modified asphalt was optimized using orthogonal experiments,and the viscosity,temperature sensitivity,high and low temperature rheological properties,as well as performance grading(PG)of nano-ZnO,SEBS,nano-ZnO/SEBS modified asphalt and matrix asphalt were compared and analyzed through experiments such as Brinell rotation viscosity,penetration,ductility,softening point,and high and low temperature rheological properties,in order to determine the optimal formula.The experimental results show that the optimal amount of modifier for preparing nano-ZnO/SEBS composite modified asphalt is 3%nano-ZnO+5%SEBS,and the optimal preparation plan is to add SEBS first and then nano-ZnO.The temperature sensitivity of composite modified asphalt with this dosage is significantly reduced,and the low-temperature crack resistance performance and PG continuous grading􀆳s high and low temperature service temperature range are significantly improved,with the most significant improvement in the high-temperature performance of asphalt.

关 键 词：道路工程 纳米ZNO SEBS 复合改性沥青 沥青流变性能 PG分级 

分 类 号：U414[交通运输工程—道路与铁道工程]