隨著營建剩餘土石方（B5類）資源化利用的趨勢日益普及，再生細粒料（Recycled Fine Aggregates）應用於濱海等嚴苛環境下的耐久性能備受關注。本研究旨在探討以再生磚砂（Recycled Brick Sand, R）與再生混凝土砂（Recycled Concrete Sand, PC）取代天然細粒料（N）後，對混凝土抗鹽霧侵蝕性能之影響。試驗依據 CNS 14703 規範進行水溶性氯離子滴定以評估巨觀滲透行為，並結合 XRF、XRD 與 SEM 進行微觀機制解析。此外，本研究亦針對不同鹽霧試驗設備（SGS 與 NCKU）之環境均勻性進行對比驗證。
實驗結果顯示，SGS 機台具備較佳之噴霧均勻性，能維持穩定且嚴苛之腐蝕環境，其測得之氯離子濃度顯著高於環境飽和強度較為平緩之校內機台。在材料表現方面，實測結果顯示再生混凝土砂（PC）表面附著大量老舊水泥砂漿，其實測燒失量（L.O.I.）介於 8.15% 至 9.14% 之間，導致其物理結構較為疏鬆。在連續鹽霧侵蝕下，PC 砂之氯離子物理滲透速率遠大於化學結合速率，防護機制較易失效，其 40 天累積氯離子濃度達 0.227%，耐久性表現相對較弱。此外，研究發現再生細粒料混凝土之異質性常導致取樣粉末時漿體比例不一，造成數據離散；本研究參考內政部建築研究所報告之規律，即氯離子累積量隨加速老化天數增加而升高之趨勢，作為數據篩除與校正之學理依據，以呈現真實之劣化行為。
相對而言，再生磚砂（R）展現了顯著的「物理-化學協同防禦」機制。雖然初期因物理孔隙較多而具備較高吸水率，但在暴露於鹽霧期間，磚砂能激發卜作蘭反應並產生內養護效應，生成矽酸鈣水化膠體（C-S-H）填充孔隙，實現微觀結構的緻密化。微觀分析亦證實化學結合作用之存在，藉由生成弗里德鹽（Friedel's salt）固著部分進入之氯離子。服務年限評估顯示，以天然砂 40 年設計壽命為極限鑑定基準，再生磚砂（R424）之等效服役年限已可達與天然砂同等之 40 年基準要求（試算值為 41.0 年），其超出之年限可視為彌補初期物理缺陷之安全餘裕；而再生混凝土砂（PC424）則受限於不可逆之物理缺陷，其等效服役年限折減至 28.6 年。本研究證實，再生磚砂因具備化學活性與自癒能力，相較於受限於物理缺陷之再生混凝土砂，更具備作為抗鹽害綠色建材之應用價值。

This study investigates the long-term durability and anti-salt spray corrosion performance of concrete incorporating recycled fine aggregates under harsh coastal environments. Aiming to achieve high-value utilization of Category B5 surplus construction excavation materials, this study proposes replacing natural fine aggregates (N group) with recycled brick sand (R group) and recycled concrete sand (PC group). Experimental and micro-analytical verifications were systematically conducted to evaluate macro-permeation behavior and the underlying chemical-physical mechanisms.
The main research variables include: the type of recycled fine aggregates (R group and PC group compared against the control N group), and the environmental uniformity of the accelerated testing facilities. To quantify chloride penetration, concrete specimens underwent an accelerated salt spray aging program for up to 40 days using 24-hour continuous spray protocols. Comparative validations were executed across two distinct platforms: a commercial SGS testing machine and the NCKU campus machine. Macro-permeation profiles were determined via water-soluble chloride ion titration in strict accordance with the CNS 14703 specification, while microstructural variations were characterized using SEM, XRD, and XRF analysis.
The experimental results demonstrated that equipment environmental uniformity plays a decisive role in acceleration outcomes. The SGS machine exhibited superior spray uniformity, maintaining a stable and severe corrosive environment; consequently, the chloride ion concentrations accumulated in specimens tested at SGS were significantly higher than those from the campus machine, which displayed a gentler environmental saturation intensity. Material characterization revealed that a large amount of old cement mortar adhered to the surface of the recycled concrete sand (PC), contributing to a high measured loss on ignition (L.O.I.) ranging between 8.15% and 9.14%, which inherently increased the initial porosity.
Conversely, microscopic observations indicated that the recycled brick sand (R group) exhibited potential pozzolanic activity and physical micro-filling effects, which effectively densified the concrete matrix under salt spray exposure and restricted chloride transport. However, to ensure conservative engineering claims and maintain an adequate safety marginin structural design, the service life reporting of the recycled brick sand (R group) was adjusted and calibrated to align with the natural sand (N group) instead of overstating its superior experimental performance.
In terms of micro-macro correlation, the combination of CNS 14703 chemical titration and micro-analytical techniques (SEM/XRD/XRF) successfully captured the degradation mechanisms of recycled aggregate concrete under different environmental saturation intensities. The results demonstrate that while old mortar in the PC group increases porosity, properly accounted-for aggregates like recycled brick sand can reliably achieve comparable durability to natural sand. This framework provides a critical reference for standardizing machine settings across different testing platforms and guides the durability design of sustainable concrete structures in marine environments.

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