為因應2050淨零碳排目標，卜特蘭石灰石水泥混凝土（Portland Limestone Cement concrete，PLC）與預拌回收再生細粒料混凝土（Recycled Ready-mix Aggregate concrete，RRA）已逐步進入結構工程應用研究。雖然既有研究已確認PLC與RRA之力學性質與梁柱耐震性能均與傳統卜特蘭一型水泥混凝土（Ordinary Portland Cement concrete，OPC）相近，然而現行「混凝土結構設計規範」（401-112）之直線伸展長度公式係以OPC實驗資料為基礎所建立，針對PLC與RRA此兩類低碳混凝土材料之適用性，目前仍缺乏系統性之握裹實驗。
本研究採用梁端偏心拉拔實驗（Beam-End Test），針對15組試體評估其握裹效益比( "R" _"eff" )。實驗變數包含混凝土設計強度( f_c^' = 28 , 42 , 70 MPa)與鋼筋等級 (SD 420W , SD 550W , SD 690W) 及RRA之取代率 (10%、20%、50%、100%)，並進一步探討在100%取代率下，封固二氧化碳（CO2）後對於握裹性能之影響。
實驗結果顯示，PLC 與 RRA 混凝土之握裹效益比（R_eff）介於 1.11 至 1.77 之間。RRA 組別以 10% 取代率之握裹強度為最優；100% 取代率試體經 CO2 固碳處理後，其握裹效益比有顯著提升。兩種低碳混凝土材料之破壞模式均與OPC相同，顯示低碳材料並未改變握裹破壞機制，綜合上述實驗結果可以證實PLC與RRA之握裹性能符合現行規範要求。

In response to the 2050 net-zero carbon emissions target, Portland Limestone Cement concrete (PLC) and Recycled Ready-mix Aggregate concrete (RRA) have been gradually introduced into structural engineering research as sustainable alternatives to conventional Ordinary Portland Cement concrete (OPC). Although prior studies have confirmed that both PLC and RRA exhibit mechanical properties and seismic performance in beam–column members comparable to those of OPC, the straight development length provisions in the current Taiwanese Concrete Structure Design Code (401-112) were established based on OPC test data. The applicability of these provisions to PLC and RRA remains insufficiently verified through systematic direct bond testing.
This study employed a beam-end eccentric pull-out test (Beam-End Test) to evaluate the bond efficiency ratio (〖 R〗_eff ) of 15 specimens. The experimental variables comprised three concrete design compressive strengths (f_c^' = 28 , 42 , 70 MPa), four volumetric replacement ratios of recycled ready-mix aggregate (10%, 20%, 50%, and 100%), The study further investigates the effect on bond performance of sequestering carbon dioxide (CO₂) at a 100% replacement ratio.
The results demonstrate that R_eff values for all PLC and RRA specimens ranged from 1.18 to 1.77. Among RRA groups, the 10% replacement ratio yielded the highest bond strength, while specimens with 100% replacement subjected to CO₂ treatment exhibited an approximately 11% improvement in R_eff . Furthermore, the failure modes of both low-carbon concrete types were consistent with those observed in OPC specimens, indicating that the substitution of low-carbon materials does not alter the fundamental bond failure mechanism. These findings collectively confirm that the bond performance of PLC and RRA conforms to the requirements of the current design code.

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