研究採用回收低密度聚乙烯 (Recycled Low-Density Polyethylene, RPE)與橡膠粉 (CR)作為改質劑，此兩者分別作為塑性體和彈性體，混合
拌製改質瀝青，並透過光學顯微鏡觀察改質瀝青微觀型態，探討改質瀝青
物理性質。添加 5%RPE在之改質瀝青微觀下呈現不規則狀，彼此較容
易接觸產生物理纏繞，改質效果較好，但高溫工作性差；添加 5%和 7%橡膠粉在微觀下產生聚集現象，方才具有較明顯之改質效果。本研究中隨
RPE含量的改質效果較橡膠粉含量提升明顯， RPE對軟化點、黏度和韌
性具有改質效果；橡膠粉則提供彈性，可改善軟化點和針入度 ，但對於彈
性恢復率之改質效果有限。 多重應力潛變恢復 (MSCR)試驗結果說明，
RPE含量越高抗 變形 能力越好， 橡膠粉含量越高 彈性恢復 效果 較好，然
而 本研究之改質瀝青皆 無法符合 超過恢復百分比之 需求。建議以 3%RPE和 7%橡膠粉之比例製備改質瀝青，以獲得較好之工程性質。

This study used recycled low-density polyethylene (RPE) which is plastic, and crumb rubber (CR) which is elastomers as modifier. By using optical microscope to observe morphology of modified asphalt, and discuss its properties with various experiment. When RPE content up to 5%, the morphology of modified asphalt is irregularity, modifier contact each other more easily, that modifier contact each other increase performance significantly, but decreases high-temperature workability. When CR content up to 5% and 7%, microscopic rubber clusters, and increase modified asphalt performance. RPE is better modifier than CR in this study. RPE improves performance such as softening point, viscosity, and toughness. CR provides elastic recovery, but not as effective as styrene-butadiene-styrene.CR improves performance such as softening point, and penetration. Multiple stress creep recovery (MSCR) test shows that increasing content of RPE improves resistance to permanent deformation of asphalt. Increasing content of CR improves elastic recovery. However, there is no sample in this study meets the requirement of recovery. In this study suggests producing modified asphalt with 3%RPE and 7%CR to ensure great mechanical property.

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