瀝青膠泥具有非常複雜之化學結構，其可表現出黏性與彈性行為，對於這些特性，氣候溫度和交通承載量是關鍵之因素，瀝青路面於生命週期內提前損壞之原因與瀝青混合料暴露於低溫或高溫下之性能有關，包含車轍變形與疲勞開裂等；為了改善瀝青膠泥之性能，本研究製作不同二氧化矽濃度之剪切增稠流體(Shear ThickeningFluid, STF)，摻入基底瀝青膠泥改質並進行疲勞性能及車轍性能之相關研究，並且製作瀝青混合料進行力學試驗，驗證改質後瀝青膠泥之性能；本研究以基底瀝青膠泥AC20 之重量百分比做為STF 改質劑之添加比例(10%、20%及30%)，分別進行基本物性試驗及流變性能試驗；基本物性試驗採用軟化點試驗及黏滯度試驗，流變性能試驗採用頻率掃描試驗、黏結料降伏能量試驗、線性振幅掃描試驗、Glower-Rowe 試驗及多重應力潛變恢復試驗；瀝青混合料採用間接張力開裂試驗及間接張力車轍試驗；透過試驗數據分析，STF 材料能有效減低AC20 之溫度敏感性且改變瀝青膠泥之黏彈性能；STF 高溫狀態結晶化提升AC20 之抵抗永久變形及抵抗剪切變形能力，於低溫能透過稀釋瀝青膠泥之硬化程度及奈米二氧化矽填充微小間距與不連續性，使瀝青膠泥之整體結構性更加完善，進而提升抵抗疲勞開裂能力；此外，本研究還評估STF 材料對於密級配熱拌瀝青混合料抵抗永久變形與疲勞開裂之影響，結果顯示，添加STF 材料顯著提高瀝青混合料之抗車轍性能，適量添加亦能提高抗疲勞開裂性能，根據添加量不同而有所變化；綜觀來說，加入STF 材料能有效改善基底瀝青膠泥AC20 之抗車轍性能與抗疲勞性能，其中以添加10%STF 為最適當添加量，其能在高溫狀態提升抗車轍性能及低溫狀態提升抗疲勞性能，成功達到雙向性能提升之目標。

Asphalt binders have a highly complex chemical structure that exhibits both viscous and elastic behavior. The key factors affecting these properties are climate temperature and traffic load. Premature damage to asphalt pavements during their lifecycle is related to the performance of asphalt mixtures exposed to low or high temperatures, including rutting
deformation and fatigue cracking. To improve the performance of asphalt mastic, this study produced shear thickening fluids (STF) with varying concentrations of silica and incorporated them into base asphalt binder for modification. The study conducted relevant research on fatigue performance and rutting performance and also produced asphalt mixtures for mechanical testing to verify the performance of the modified asphalt binders. In this study, the STF modifier was added to base asphalt binder AC20 in weight percentages of 10%, 20%, and 30%, and subjected to basic physical property tests and rheological
performance tests. The basic physical property tests included the softening point test and viscosity test, while the rheological performance tests included frequency sweep tests, binder yield energy tests (BYET), linear amplitude sweep tests (LAS), Glower-Rowe tests, and multiple stress creep recovery tests (MSCR). The asphalt mixtures were subjected to indirect tensile cracking tests (IDEAL-CT) and indirect tensile rutting tests (IDEAL-RT).
Through analysis of the test data, STF materials were found to effectively reduce the temperature sensitivity of AC20 and alter the viscoelastic properties of the asphalt mastic.
The crystallization of STF at high temperatures enhanced AC20’s resistance to permanent deformation and shear deformation, while at low temperatures, it diluted the hardening
degree of the asphalt binder and the nano-silica filled micro-gaps and discontinuities, resulting in a more complete overall structure of the asphalt binder, thus improving fatigue cracking resistance. Additionally, this study evaluated the impact of STF materials on the resistance to permanent deformation and fatigue cracking of dense-graded hot-mix asphalt mixtures. The results showed that adding STF materials significantly improved the rutting resistance of asphalt mixtures, and appropriate additions also enhanced fatigue cracking resistance, varying with the amount added. Overall, the inclusion of STF materials effectively improved the rutting resistance and fatigue performance of base asphalt binder AC20, with 10% STF addition being the optimal amount, achieving the goal of dual performance enhancement by improving rutting resistance at high temperatures and fatigue resistance at low temperatures.

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