SBS改性沥青低温粘度的动态剪切流变测试方法

Low temperature Viscosity Determination of SBS Modified Asphalt with Dynamic Shear Rheometer Method

摘要:

根据动态剪切流变仪试验原理,建立了沥青的复数模量G*、相位角δ与复数粘度η*、动力粘度η′之间的相互关系.通过1种基质沥青,4种聚苯烯苯乙烯聚苯烯(SBS)改性剂制备的7种改性沥青的动态力学试验,得出了不同掺量、不同改性剂类型对动力粘度η′的影响规律,通过60℃粘度实测值与预估值η′=sin δ-4.862 8G*/ω的比较,证明了用动态剪切流变仪测试沥青和改性沥青的低温粘度的可行性.

Abstract:

Based on the fundamental principle of Dynamic Shear Rheometer(DSR),the relationship between the complex shear modulus G*,phase angle δ and complex viscosity η*,dynamic viscosity η′ was established.Through the DSR tests of 7 types of SBS modified asphalts which are composed of one baseasphalt and 4 SBS polymers,the dosage and types effects of SBS on the dynamic viscosity η′ were discussed.The comparison of measured viscosity and estimated viscosity of η′=sin δ-4.862 8G*/ωat 60℃ shows that it is likely to get the lowtemperature viscosity of asphalt and modifiedasphalt with DSR method.