本研究主要探討廢PCB板中玻璃纖維粉與樹脂粉取代細粒料(天然河砂)以固化於水泥砂漿，主要目的為促進此種廢棄物再利用於以水泥為基底之材料中，達到資源再生利用之可行途徑，並且符合綠色建材之研發方向。經取得破碎PCB板之玻璃纖維，外觀呈短籤形狀之破斷外形，長度小於6 mm、樹脂粉為細顆粒，兩者粒徑分布均有很大的變異，但95%以上通過#16篩。考慮添加於水泥砂漿的資源化前提下，以取代砂方式施行，以固定體積取代砂之配比，配比設計以標準砂漿重量比（砂：水泥：水＝2.75：1：0.485）為依據作為對照組之條件下，測試水泥砂漿之新拌與硬固性質。研究結果顯示；玻璃纖維粉及樹脂粉取代超過5%時，水灰此0.485之流度值驟減180mm以下，適於不具垂流之場合。至於硬固力學之測試結果，抗壓強度增加量不顯著，但抗彎強度皆高於標準水泥砂漿，另外乾縮裂縫將隨取代砂量的增加而減少，顯示廢PCB板之玻璃纖維可適量使用於水泥砂漿之中（建議2%以下），提供此工業廢棄物再利用的另一合理應用途徑。

This study focused on the use of glass fiber of waste PCB powder to replace fine aggregate (natural sand) and realize the toxicity characteristics of cement mortar. The main purpose is to promote the re-use of such waste with cement as the basic material to achieve the feasible way of the use of renewable resources, in line with the development of green building materials. The glass fibers were made from the broken PCB board, with the average length less than 6 mm. In this study, cement mortar with PCB powder was added to replace sand with the fixed mix proportion ratio (sand: cement: water = 2.75: 1: 0.485) as the base of the control group. The fresh and hardened properties were studied to reveal their performance. The result of this study is that when the addition of glass fiber is more than 5%, the flowability of specimens with water-to-cement ratio of 0.485 were dropped suddenly down to 180 mm. The results indicate that the compressive strength has not significantly improved; however the bending strength was higher than the standard cement mortar. In addition, the shrinkage cracks of sand-replaced specimens were reduced. These results showed that waste PCB powder and glass fiber could be used in the cement paste mortar (recommendation for less than 2%), which can provide another way to the re-use of such industrial waste.

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