多聚磷酸改性沥青老化前后高温流变性能

发布时间：2018-06-16 17:01

本文选题：多聚磷酸 + SBS改性沥青　；参考：《复合材料学报》2017年07期

【摘要】：基于动态剪切流变(DSR)试验,对老化前后三种改性沥青:多聚磷酸(PPA)改性沥青、苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青及SBS-PPA复合改性沥青的高温性能进行分析。结果表明:在不同温度及老化作用下,与SBS改性沥青相比,PPA改性剂对沥青高温流变性能的改善更为突出,沥青中黏性成分减小,弹性成分增加。在SBS改性沥青中添加PPA可以明显增强改性沥青的弹性,降低其黏性,SBS-PPA复合改性沥青的高温性能优于SBS改性沥青。在长期老化下,PPA和SBS-PPA复合改性沥青中由储存模量G′占主导作用转变为损失模量G″占主导作用的温度转化点都较高,温度转化点:PPASBS-PPA郘SBS。对于SBS改性沥青,温度和频率比老化作用对复数模量G*和相位角δ的影响更大,而PPA和SBS-PPA复合改性沥青受老化影响较大,随着老化程度的加深,可以在较宽的温度和频率范围内保持一定的弹性来抵抗变形。PPA改性沥青在老化前后,不同温度和频率下都具有较高的车辙因子G*/sinδ,且老化后G*/sinδ增加的最多,高温抗车辙能力更强,其次是SBS-PPA复合改性沥青。
[Abstract]:Based on the dynamic shear rheology (DSRs) test, the high temperature properties of three kinds of modified asphalt: polyphosphate PPA-modified asphalt, styrene-butadiene-styrene block copolymer (SBS) modified asphalt and SBS-PPA composite modified asphalt before and after aging were analyzed. The results show that compared with SBS modified asphalt, PPA modifier can improve the rheological properties of asphalt at different temperature and aging. The viscosity and elasticity of asphalt are decreased and elastic components are increased. Adding PPA to SBS modified asphalt can obviously enhance the elasticity of modified asphalt and reduce its viscosity. The high temperature performance of SBS-PPA composite modified asphalt is better than that of SBS modified asphalt. The temperature transition point from storage modulus G'to loss modulus G "is higher than that of PPA and SBS-PPA composite modified asphalt under long-term aging, and the temperature transition point is: PPASBS-PPA / SBS. For SBS modified asphalt, temperature and frequency have more influence on complex modulus G * and phase angle 未 than aging, while PPA and SBS-PPA composite modified asphalt are greatly affected by aging. It can keep a certain elasticity in a wide range of temperature and frequency to resist the deformation. PPA modified asphalt has higher rutting factor GN / sin 未 at different temperatures and frequencies before and after aging, the GN / sin 未 increases most, and the rutting resistance at high temperature is stronger. The second is SBS-PPA modified asphalt.
【作者单位】：内蒙古工业大学土木工程学院;
【基金】：国家自然科学基金(11462018) 内蒙古自治区自然科学基金(2015 MS0539) 内蒙古交通科技建设项目(NJ-2014-21)
【分类号】：U414

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