本研究以台南市北外環快速道路第三期工程為案例，探討超高性能混凝土（Ultra High Performance Concrete, UHPC）應用於橋梁伸縮縫之碳排放效益，研究方法採全生命週期評估（Life Cycle Assessment, LCA），針對傳統伸縮縫、UHPC伸縮縫及UHPC連接板三種工法，建立初始完成、維護、重作及拆除等各階段之碳排量計算模型，並比較不同工法於全生命週期的碳排放表現。
分析結果顯示，雖然UHPC在初始完成階段因材料成分碳排量較高，但其高耐久性可有效延長使用年限並降低維護頻率，相較於傳統伸縮縫工法，UHPC伸縮縫與UHPC連接板在相同分析年限下的全生命週期總碳排量均較低，其中以連接板工法效益最為顯著。
綜上所述，UHPC應用於橋梁伸縮縫工程不僅具備結構耐久性與行車舒適性的優勢，更能透過降低維護頻率與延長使用壽命，達到整體減碳效益。研究成果可提供國內未來橋梁設計與維護工法選擇之參考，並呼應政府推動減碳及永續發展政策，顯示其具備高度可行性與推廣價值。

In response to global climate change and the 2050 Net Zero emissions goal, the construction industry is prioritizing low-carbon infrastructure. Bridge expansion joints are critical but vulnerable components, often requiring frequent maintenance due to heavy traffic loads and environmental degradation. These maintenance activities generate both direct material emissions and indirect emissions associated with traffic congestion. Ultra-High Performance Concrete (UHPC), characterized by its superior mechanical properties and durability, offers a solution to extend service life and minimize maintenance needs.
This study uses the Tainan Northern Outer Ring Road Phase 3 project as a case study to quantify the life cycle carbon emission benefits of applying UHPC to bridge expansion joints. A Life Cycle Assessment (LCA) model was established to evaluate three construction methods: (1) Traditional Expansion Joint, (2) UHPC Expansion Joint, and (3) UHPC Link Slab. The assessment covers a 100-year analysis period, incorporating carbon emissions from initial construction, maintenance, replacement, demolition, and indirect traffic delays, while also considering steel recycling benefits.
The results indicate that although UHPC exhibits a higher initial carbon footprint, its superior durability substantially reduces maintenance frequency over the service life. The UHPC Link Slab demonstrated the lowest life cycle carbon emissions. Even for the UHPC Expansion Joint, the cumulative carbon benefits surpass those of traditional methods after approximately 5 to 7 years of service. This study confirms that adopting UHPC materials, particularly the jointless Link Slab design, is an effective strategy for achieving sustainable and resilient bridge infrastructure.

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