全球持續暖化導致氣候變遷，使得近年歐美國家及澳洲之夏季森林野火災害愈趨頻繁，災後的廢棄木灰(WA)對環境造成汙染；另外，臺灣每年生產大量稻殼，導致大量廢棄稻殼灰(RHA)棄置與環境問題；因此，若能加以應用生質灰(Biomass Ash)於鋪面材料，可達到環保、維護環境的目的，亦可成為促進循環經濟的一環，然而，木灰、稻殼灰在瀝青混凝土中之工程應用資訊則相對匱乏，且大多應用於替代填料，且尚未針對其對瀝青改質之效果進行相對應之鋪面績效評估。本研究將木灰、稻殼灰分兩種應用方式:一為瀝青改質劑(2%、4%、6%)之濕式製程，二為取代填料(50%、100%)之乾式製程，先將生質灰改質瀝青與基底瀝青做基本物性分析比對，再進行流變性能試驗，取得車轍性能、疲勞性能；再藉由瀝青混合料之馬歇爾試驗、間接張力開裂試驗(IDEAL-CT)、間接張力強度試驗(IDT)、水侵害試驗、高溫間接張力強度試驗(HT-IDT)以及間接張力車轍試驗(IDEAL-RT)，評估木灰、稻殼灰作為瀝青改質劑或填料之效益。接著分析HT-IDT與IDEAL-RT試驗相關性，並評估瀝青流變性能參數與瀝青混凝土之HT-IDT和IDEAL-RT參數關係。根據試驗結果顯示，採濕式製程時，木灰作為改質劑相較於稻殼灰使膠泥較硬質、韌性較佳流動性高，而稻殼灰則工作性較佳，生質灰之添加量增加皆使膠泥韌性降低，但韌性之最大抗拉強度提高。濕式製程中，木灰與稻殼灰比較，木灰隨著添加量而提升而穩定值和RT index隨之提升，在HT-IDT最佳添加量為4.2%、在IDEAL-CT最佳添加量為3.2%，稻殼灰則隨添加量提高IDT值，在HT-IDT最佳添加量為3.2%、在IDEAL-CT最佳添加量為2.7%；在乾式製程中，木灰與稻殼灰比較，木灰提高提高G*/sinδ、稻殼灰線性振幅掃描性能較佳。生質灰採乾式製程時，生質灰取代填料量在50%，使穩定值高於對照組，木灰表現較稻殼灰佳，木灰取代填料會隨著取代量增加抗開裂指數上升，稻殼灰作為填料有助於提升瀝青混凝土之抗水侵害能力。製程比較方面，在馬歇爾試驗、HT-IDT和IDEAL-RT，濕式製程整體表現優於乾式製程；而在IDEAL-CT與水侵害試驗，乾式製程大多表現優於濕式製程，且HT-IDT與IDEAL-RT對比，兩者試驗相關性高；對於膠泥流變性能與HT-IDT與IDEAL-RT比較，在乾式製程中，隨著|G*|/sinδ提升，HT-IDT值與RT index，也隨之提升。

The escalating global warming has triggered significant climate changes, leading to a surge in devastating forest wildfires during summer seasons across Europe, America, and Australia. These fires result in the accumulation of waste wood ash (WA). Besides, substantial amounts of rice husk were produced from a major crop in Taiwan, leading to significant quantities of rice husk ash (RHA). WA and RHA are biomass ashes that severely threaten the environment. Using biomass ash in pavement materials has emerged as an environmentally friendly approach to environmental preservation and advancing circular economy initiatives. This study looks at WA and RHA as asphalt modifiers in a wet process at 2%, 4%, and 6% concentrations and as filler replacements in a dry process at 50% and 100% replacement levels. Over modified asphalt, the fundamental properties of the asphalt binder were investigated, and rutting and fatigue tests were performed to see how well the asphalt held up. WA and RHA were tested as filler replacements in asphalt concrete by using Marshall stability, indirect tensile tests (IDT), moisture damage, indirect tensile cracking tests (IDEAL-CT), indirect tensile cracking tests at high temperatures (HT-IDT), and indirect tensile rutting tests (IDEAL-RT). In the wet process, WA, as a modifier, makes the binder stiffer with enhanced toughness and greater flowability than RHA, demonstrating superior workability. When WA and RHA-modified asphalt binders were used in asphalt concrete, the stability value and RT index of wood ash increased with increasing dosage, with optimal addition content of 4.2% for HT-IDT and 3.2% for IDEAL-CT. Rice husk ash, on the other hand, exhibits an increase in IDT value with increasing dosage, with optimal content of 3.2% for HT-IDT and 2.7% for IDEAL-CT. When WA and RHA are used as fillers in asphalt concrete, replacing 50% of the material gives stability values higher than those of the control group, with WA exhibiting superior performance compared to RHA. Moreover, as the WA replacement increases, the cracking resistance index rises, whereas RHA as a filler contributes to improved water resistance in asphalt concrete. In terms of process comparison, the wet process generally outperforms the dry process in Marshall tests, HT-IDT, and IDEAL-RT, while the dry process predominantly outperforms the wet process in IDEAL-CT and moisture susceptibility tests. A high correlation is observed between the HT-IDT and IDEAL-RT tests. Regarding the comparison between binder rheological properties and HT-IDT and IDEAL-RT, an increase in |G*|/sinδ in the dry process leads to a simultaneous rise in HT-IDT values and RT index.

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