新型温拌改性沥青流变性能研究

Rheological Properties and Microstructure of Warm Mixing Asphalt

为降低沥青混合料施工过程中大量的能源消耗和废气排放,研发了新型温拌沥青改性剂,基于布洛克菲尔德旋转黏度试验,确定了温拌剂降黏特性。采用动态剪切流变试验（DSR）试验研究了温拌剂掺量、温度等因素对沥青流变性能的影响规律。结果表明：温拌剂掺量大于1%时,沥青黏度降低约80%,与SBS改性沥青相比,在64-70℃范围内时,温拌改性沥青抗车辙因子提高幅度为28.6%-71.4%,温拌剂的加入不仅降低了沥青黏度,而且改善了沥青高温性能。

New warm mixing modified asphalt was prepared to reduce energy consumption and greenhouse gas emissions in the construction process of asphalt mixture, the viscosity-reduction property of new warm mix agents were determined by Brookfield viscosity test, factors such as temperature mixing agent dosage, temperature on rheological properties of asphalt were analyzed comprehensively through dynamic shear rheological test. The results indicate that asphalt viscosity decreased about 80% when warm mixing additive quantity is more than 1%, compared with SBS modified asphalt, warm mix modified asphalt anti rut factor increased 28.6% - 71.4% in 64 - 70 Gy DEGC, warm mix additives not only reduced the viscosity of asphalt, and improve performance of asphalt in high temperature.