台灣因土地資源有限，建築用天然砂石長年大量開採，造成河川生態破壞與環境災害風險；同時，舊建物拆除所產生的大量混凝土廢料若未妥善處理，亦將加重土地與資源壓力。為落實資源再利用與循環經濟，本研究提出以再生混凝土砂及輕質陶粒替代傳統細、粗粒料之再生混凝土，並實際應用於結構構件中，評估其力學與耐震性能，驗證其於工程應用之可行性。
本研究所採用之細粒料為經回收混凝土塊破碎篩分後製得之再生砂，粗粒料則為以連續壁施工產生之皂土燒結而成的輕質陶粒。兩者分別取代傳統混凝土中天然細粒料與粗粒料後，依設計配比製成新拌混凝土，進行鋼筋綁紮與構件製作，並施作成三組試體，包括中軸力柱、低軸力柱與梁構件。試體經由國家地震工程研究中心反覆側推試驗進行耐震行為評估，並與使用一般混凝土之對照試體進行比較。
試驗評估指標包括最大側力、層間位移角、降伏勁度、位移韌性、等值遲滯阻尼比、回復勁度比、殘留位移與能量耗散比等，並依ACI 374.1-05規範進行檢核。結果顯示，再生粒料製成的混凝土構件多項性能與一般混凝土相當，甚至部分項目表現更佳，而在ACI374.1-05的檢核中，所有試體皆可通過，顯示構件性能的可靠。
此外，研究亦應用TEASPA與ETABS結構分析軟體進行數值模擬，導入實驗所得材料參數非線性塑鉸模型，進行測推分析模擬試驗行為。模擬所得骨架曲線與實驗數據吻合度高，驗證此類再生混凝土材料可納入實務設計流程。

This study explores the structural feasibility and seismic performance of reinforced concrete (RC) members utilizing eco-friendly materials—specifically, recycled concrete sand and lightweight ceramsite aggregates. The recycled fine aggregate was produced from demolished concrete waste, fully replacing natural sand, while the lightweight coarse aggregate was derived from sintered waste slurry cakes. These sustainable materials were used to fabricate three full-scale RC specimens: a medium axial load column, a low axial load column, and a beam. All specimens were subjected to low-cycle lateral loading tests at the National Center for Research on Earthquake Engineering (NCREE) in Tainan.
Experimental results indicated that the specimens made with recycled materials (designated FRAC-C2-424) performed comparably to or better than those made with conventional ordinary Portland cement (OPC) concrete. The beam specimen exhibited enhanced energy dissipation, stable hysteresis loops, and sufficient displacement ductility. Key performance indicators—such as peak lateral load, drift ratio, yield stiffness, residual displacement, and equivalent damping ratio—met the requirements of ACI 374.1-05, with all specimens achieving an energy dissipation ratio exceeding 12.5%.
To validate experimental outcomes, nonlinear pushover analyses were performed using TEASPA and ETABS software. The models incorporated measured material properties and P-M interaction relationships, successfully replicating the experimental skeleton curves and failure patterns.
Overall, the findings confirm that recycled concrete sand and lightweight aggregates can be effectively applied in structural RC members without compromising seismic safety.

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