Abstract: Taking?rubber?powder?of?ramp?and?meridian?waste?tire?as?the?modifier,the?modified?asphalt?tests?of?routine?performance,?dynamic?shear?rheometer?（DSR）?and?bending?beam?rheometer（BBR）?are?conducted?with?three?kinds?of?particle?size,?including?20?mesh?,40?mesh?and?80?mesh,?as?well?as?the?condition?of?20%?mixing?amount.?The?modification?mechanism?and?thermodynamics?performance?of?rubber?powder?are?researched?from?the?experiments?of?differential?scanning?calorimetry.?The?results?indicate?that?modified?asphalt?performances?of?anti-rutting,?anti-fatigue?and?low?temperature?performance?are?improved?after?rubber?powder?modification;?the?rubber?powder?modification?effect?of?ramp?tire?is?superior?to?that?of?meridian?tire?;?the?improvement?effect?of?penetration?index,?anti-rutting?factor?and?elastic?recovery?of?modified?asphalt?is?better?in?the?case?of?greater?particle?size?rubber?powder,?and?the?low?temperature?performance?is?similar?to?that?of?smaller?particle?size?;?so?considering?the?performance-price?ratio,the?optimal?particle?size?is?20?mesh?and?the?optimal?mixing?amount?is?20%.

Key words: asphalt , crumb rubber , crumb rubber modified asphalt , differential scanning calorimetry（DSC） , performance ;

摘要： 以斜胶胎和子午胎两种废胎胶粉作为改性剂,对20、40和80目3种粒径以及20%掺量下改性沥青进行了常 规性能、动态剪切(DSR)和弯曲梁流变(BBR)试验,系统研究了废胎种类、胶粉粒径对改性沥青高温和低温性能的 影响;采用差热分析(DSC)试验方法,分析了20%胶粉掺量下胶粉粒径对沥青的改性效果和胶粉改性沥青的热力 学性能。结果表明:掺入废胎胶粉后的沥青,其高温抗车辙、低温抗裂和抗疲劳等性能改善明显,斜交胎胶粉的改 性效果优于子午胎胶粉;较大粒径的胶粉对沥青的软化点、抗车辙因子、弹性恢复改善效果较好,而低温性能与胶 粉粒径小的改性沥青相当。综合性价比,建议采用斜交胎胶粉,胶粉的最佳粒径为20目,掺量为20%。

关键词: 沥青, 废胎胶粉, 废胎胶粉改性沥青, 差热分析(DSC), 性能