Polymer-Modified Asphalt Mixed with Thermoplastics and Thermoelastics

• Main Authors: Chun-FuHuang, 黃俊富
• Other Authors: Jian-Shiuh Chen
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/7t4729

碩士 === 國立成功大學 === 土木工程學系 === 103 === 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.