飛灰基無機聚合物應用於混凝土構件補強之可行性研究

Feasibility Study on the Application of Fly-Ash-Based-Geopolymer to Retrofitting the Concrete Members

黃立遠(Li-Yuan Huang) ； 陳柏存(Bo-Tsun Chen) ； 施正元(Jeng-Ywan Shih) ； 張大鵬(Ta-Peng Chang) ； 陳鐿夫(Yi-Fu Chen) ； 周佳靜(Chia-Ching Chou)

《中國土木水利工程學刊》 22卷3期 (2010/09) Pp. 263-274

https://doi.org/10.6652/JoCICHE.201009_22(3).0003

摘要

無機聚合物（geopolymer）為一種新型膠結材料，具有低耗能、高性能／價格比、易加工、耐燃及耐腐蝕等特性，可作為劣化混凝土結構物之補強材料。本研究係以F級飛灰與鹼性溶液製成無機聚合物膠體。首先探討液固比為0.45及三種不含砂量（30、50及70%）之無機聚合物砂漿材料性質，然後將最佳性質聚合物材料添加二種不同鋼纖維含量（0及1.0%）製作無機聚合物補強材料，接著進行抗壓強度、抗彎強度、動彈性模數及超音波速等工程性質試驗。試驗結果顯示：無機聚合物砂漿含砂量由30%增加至70%時，抗壓強度平均減少約17.1%，單位重平均增加約6.2%，動彈性模數平均增加約18.4%，超音波速平均減少約3.5%。以無機聚合物纖維砂漿作為圓柱試體補強之破壞型式轉為較高的韌性，而版、樑試體韌性指數增加25%，因此，無機聚合物具有作為劣化混凝土構件補強材料之良好潛力。

關鍵字

無機聚合物 ； 補強 ； 混凝土 ； 韌性指數

並列摘要

Inorganic polymer (geopolymer) is a novel cementitious material with the characteristics of low energy-consumption, high performance/price ratio, easy processing, fire resistance and corrosion resistance, etc., such that it can be used as a retrofitting material for the deteriorating concrete structures. In this study, the geopolymer paste was produced by using F class fly ash and alkali solution. First, the material properties of geopolymer mortar with a fixed liquid/binder ratio of 0.45 and three different sand contents of 30, 50 and 70 were investigated. The geopolymer mortar with optimum performance was then added with two different amounts of steel fiber (0 and 1.0) to manufacture the fiber-geopolymer-mortar used as the retrofitting material. The engineering properties of compressive strength, flexural strength, dynamic elastic modulus and ultrasonic pulse velocity were determined experimentally. The experimental results show that the sand content of geopolymer mortar increases from 30 to 70, the compressive strength reduces by an average of about 17.1, unit weight increases by an average of about 6.2, dynamic elastic modulus increases by an average of about 18.4, and ultrasonic pulse velocity reduces by on an average of about 3.5. The failure mode of cylindrical concrete specimen circumferentially confined with the fiber-geopolymer becomes more ductile and the toughness index of beam and plate specimens is increased by 25. As a result, there is a promising potential for geopolymer used as a retrofitting material for the decaying concrete members.

並列關鍵字

geopolymer ； retrofit ； concrete ； toughness index