添加高分子的改質瀝青存有相容性、儲存穩定性以及拌合溫度過高等議題，本研究於基底瀝青分別添加塑性體包含聚乙烯(polyethylene, PE)與聚丙烯(polypropylene, PP)，進行比較，選出改質效果較佳的塑性體。再與彈性體，也就是苯乙烯-丁二烯-苯乙烯(styrene–butadiene–styrene, SBS)進行摻配，摻配後之改質瀝青除了傳統的黏度、針入度、軟化點等物性試驗外，也加入韌性試驗並透過動態剪切流變儀(Dynamic Shear Rheometer, DSR)來評估改質瀝青的質流行為；另外，本研究也使用光學顯微鏡對改質瀝青進行微觀結構的分析，評估最佳的改質瀝青摻配模式。塑性體改質劑中，PE的改質效果較佳，擁有高軟化點、低黏度，且較無離析的問題，但彈性回復率均較差，需要添加彈性體才能符合規範；添加硫除了有助於降低SBS改質瀝青的離析，亦能提昇改質瀝青的高溫性能；於彈性體改質瀝青中加入塑性體可以降低改質瀝青的黏度，軟化點的增減隨著塑性體改質劑的不同而有所變化；建議最佳改質瀝青摻配比例為5%SBS+3%硫(相對於SBS重)+1%~3%PE，此時改質瀝青具有較佳的軟化點與工作性。

Polymer modified asphalt (PMA) have some problems such as compatibility, storage stability and mixing temperature is too high. In this study, base binders which were add thermoplastics including polyethylene(PE) and polypropylene(PP) were compared. Then select better thermoplastic mixing with thermoelastic(here use styrene-butadiene-styrene(SBS)). For physical properties, the blended PMA were tested include viscosity test, penetration test and softening point test etc. Besides traditional physical test, this study also add toughness test and Dynamic Shear Rheometer to evaluate rheological properties of different PMBs. In addition, optical microscope was used to analysis microstructures of PMA. Finally assessing the best PMA blending mode. PE is the best modifier in the thermoplastics which has the highest softening point, the lowest viscosity and will not separate during the hot storage. But the elastic recovery is poor, we need to add an thermoelastic to meet specifications; In addition to helping avoid the SBS modified asphalt segregation, also improved high-temperature performance of modified asphalt by adding sulfur; Thermoelastic modified asphalt can reduce viscosity by adding thermoplastics, but softening point will change with different thermoplastics；Finally, the recommended modifier content is 5%SBS+ 3% sulfur(relative to the weight of SBS)+1%~3%PE. In this case the PMA have higher softening point and better mobility.

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