實務界在使用FRP包覆補強工法之黏結材多為環氧樹脂,過去研究證實其圍束補強效果在常溫下確有相當的可靠性,但隨著溫度提高圍束效果會大幅衰減。前期研究曾以「無機聚合樹脂」取代環氧樹脂作為膠結FRP於混凝土試體之粘著材料,證實其除可提供相當程度的補強效果之外,耐高溫性能明顯優於環氧樹脂者。此外,前期研究亦曾使用「發泡無機聚合膠脂」披覆於無機聚合膠脂黏貼包覆FRP補強之圓柱試體,初步證實具有相當之耐火隔熱效果。 本研究為嘗試開發製作性能更佳的耐火隔熱材質,採用珍珠岩輕質材料添加於無機聚合物,以厚度為參數披覆於環氧樹脂黏貼包覆CFRP之補強試體。實驗結果顯示披覆在高溫下確實展現具有隔熱之效能,厚度為2.5cm之阻隔溫度效果約在100℃左右,而厚度在4.5cm則可達200℃。
In practical, the bond material used in the FRP jacketing strengthened methods is mainly epoxy. Earlier researches indicated that the effect of confined strengthening at room temperature is indeed reliable. However, it would reduce tremendously while reaches a higher temperature. Previous studies have used geopolymer to replace epoxy as the bond material for sticking FRP onto concrete cylinders, both the effects of strengthening as well as the advantage of better heat resistance were classified. Additional studies have used a porous “geopolymer foam” as the fire resistant coating to cover the concrete cylinders jacket strengthened by FRP using geopolymer, the effect of fire-resistant insulation was considerably shown. The present study attempted to develop a light weight material with better performance in fire resistance and insulation. Perlite powder was added into geopolymer mortar, and made use as the fire resistant coating with different thickness to cover the concrete cylinders jacket strengthened by CFRP using epoxy as the bond material. The experiment results revealed that the perlite geopolymer coating did display effect in heat resistance. The heat insulation effect for 2.5 cm thickness coating was around 100 ℃, while the 4.5 cm thickness perlite geopolymer coating was 150 ℃.