摘要
主要对三种国产基质沥青和六种丁苯橡胶 ( SBR)改性沥青进行了测力延度试验 (FDT)、常规技术指标试验以及 SHRP的动态剪切仪 ( DSR)和弯曲梁流变仪 ( BBR)试验 ,并且将 FDT中采用的粘弹比、拉伸柔度、应变能等指标与沥青的当量脆点 ( T1 .2 )、以及损失模量、弯曲劲度模量 ( S )、斜率 ( m )相比较 ,结果显示 FDT所选的三个评价指标与 SHRP的评价指标有良好的相关性 ,从而说明了采用 FDT对沥青结合料在老化。
Low-temperature cracking which is mostly affected by low-temperature anti-cracking performance of bitumen cement is the most important failure of bitumen pavement in permafrost region. Low-temperature performance of three kinds of domestic unmodified bitumen and six kinds of SBR modified bitumen was evaluated by force-ductility test ( hereinafter for short FDT), general experiment,dynamic shear and bending beam rheometer (hereinafter for short DSR,BBR). The result showed the favorable relationship between each evaluating index by contrasting the viscosity-elasticity ratio, tensing-flexibility, yielding strain energy of force-ductility test with equivalent breaking point(T1.2) , loss shear modulus , flexural creep stiffness ,and the velocity of creeping,thus indicating that evaluation of low-temperature performance of modified bitumen by FDT is reasonable.
出处
《石油沥青》
2004年第2期30-34,共5页
Petroleum Asphalt
