本研究針對廢棄電路板經物理處理後衍生之含鉬廢玻璃纖維，探討廢玻璃纖維樣品經熱處理前、後作為摻料製成控制性低強度回填材料(CLSM)，並經過養生後鉬溶出率之變化。經初步篩選後之22個廢玻璃纖維作為研究樣品，其中鉬含量最低5.4 ± 0.4 mg/kg，最高為344.9 ± 14.5 mg/kg，平均鉬含量為149.9 ± 89.3 mg/kg；平均鉬溶出率為0.19 ± 0.08 %。經熱處理後，平均鉬溶出率上升至9.09 ± 0.63 %。當CLSM加入15%廢玻璃纖維作為摻料，經養生後均符合再生粒料環境用途溶出標準(0.7 mg/L)。另將熱處理後之廢玻纖分別以15%、10%、5%作為CLSM摻料，由於水泥水化作用形成之AFm相、AFt相及C-S-H水化物固定鉬，使得CLSM鉬溶出率降低；經養生21日後，CLSM鉬含量高於40 mg/kg者 (37個)，鉬溶出濃度皆高於標準，低於20 mg/kg (15個)則全數合格。因此建議含鉬之廢玻璃纖維可直接再利用作為CLSM摻料；而經熱處理之廢玻璃纖維則否，若需再利用則可將鉬含量控制於20 mg/kg以下，以降低鉬溶出之風險。;This study investigates the molybdenum-containing waste glass fibers derived from waste printed circuit boards (PCBs) after physical treatment. It examines the changes in molybdenum leaching rates before and after heat treatment of waste glass fiber samples used as additives to produce controlled low-strength material (CLSM). Among the 22 waste glass fiber samples collected for the study, the molybdenum content ranged from a minimum of 5.4 ± 0.4 mg/kg to a maximum of 344.9 ± 14.5 mg/kg, with an average molybdenum content of 149.9 ± 89.3 mg/kg. The average molybdenum leaching rate was 0.19 ± 0.08%. After heat treatment, the average molybdenum leaching rate increased to 9.09 ± 0.63%. When 15% waste glass fibers was added to CLSM as an additive, the molybdenum leaching rate after curing met the environmental use leaching standard for recycled aggregates (0.7 mg/L). Additionally, when heat-treated waste glass fibers were used as CLSM additives at 15%, 10%, and 5%, the molybdenum leaching rate decreased due to the fixation of molybdenum by AFm phase, AFt phase, and C-S-H hydrates formed during cement hydration. After 21 days of curing, CLSM samples with molybdenum content higher than 40 mg/kg (37 samples) exceeded the standard for molybdenum leaching, while those with molybdenum content lower than 20 mg/kg (15 samples) all met the standard. Therefore, it is recommended that molybdenum-containing waste glass fibers can be directly reused as CLSM additives. However, heat-treated waste glass fibers should not be reused unless the molybdenum content is controlled below 20 mg/kg to reduce the risk of molybdenum leaching.
