Experimental Study on Polyphosphoric Acid (PPA) Modified Asphalt Binders
- 作者：Cao WeidongLiu ShutangCui XinzhuangShang Qingsen
- 会议时间：2009-08-06
- 关键词：polyphosphoric acid ( PPA ) ; modified asphalt binders ; performance ; mechanism
- 作者单位：School of Civil Engineering, Shandong University. No. 73 Jingshi Road,Jinan,PR China, 250061
- 母体文献：第三届中国沥青材料国际学术会议论文集
- 会议名称：第三届中国沥青材料国际学术会议
- 会议地点：青岛
- 主办单位：哈尔滨工业大学
- 语种：chi
摘要
Polyphosphric acid (PPA) modified asphalt binders were produced in the laboratory using one base asphalt and four levels of PPA contents (0.6%,1.0%,1.5% and 2.0% by weight of base asphalt).Penetration test,softening point test,rotation viscosity test,creep test with bending beam rheometer (BBR) and four components test were carried out to study the performance of PPA modified asphalt binders and possible modification mechanism.The results indicate that the high-temperature performance of PPA modified asphalt binders are obviously improved and temperature susceptibility are decreased,but the low-temperature performance slightly decline compared with base asphalt.The PPA content has a very significant effect on softening point whereas it has no significant influence on low-temperature performance according to variance analysis (ANOVA).Finally,four components test reveals that the primary modification mechanism of PPA is the change of chemical composition of asphalt binder.