In the recent 20 years, there are many studies on the polymer modified bitumen, such as SBS and SBR in the country, but the study on the modified agent is almost a blank.
近二十年来，国内关于SBS、SBR等聚合物改性沥青的研究较多，但关于外掺剂沥青和特制沥青的研究几乎为空白。
For modified bitumen of polymer, mechanism is a problem that should be studied firstly.
聚合物改性沥青的改性机理是本文主要研究的目的。
For modified bitumen of polymer, mechanism is a problem that should be studied firstly.
聚合物改性沥青的改性机理是本文主要研究的目的。
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