研究生: |
鄭百榕 Pai-jung Cheng |
---|---|
論文名稱: |
爐石飛灰複合型無機聚合物於常溫及高溫環境之工程性質 Engineering Properties of Slag-Fly Ash Composite Geopolymer at Room and Elevated Temperatures |
指導教授: |
張大鵬
Ta-peng Chang |
口試委員: |
劉玉雯
none 施正元 none 陳君弢 none |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2013 |
畢業學年度: | 101 |
語文別: | 中文 |
論文頁數: | 198 |
中文關鍵詞: | 無機聚合物 、乾縮 、高溫 、爐石 、飛灰 |
外文關鍵詞: | geopolymer, drying shrinkage, elevated temperatures, slag, fly ash |
相關次數: | 點閱:462 下載:7 |
分享至: |
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本研究係以氫氧化鈉及矽酸鈉溶液作為激發粉體活性之鹼性激發劑,並於固定之水玻璃模數下,藉由改變鹼激發量、水固比、含砂量及爐石飛灰混合比,以探討各參數組合對於複合型無機聚合物新拌及硬固性質之影響,其後再探討複合型無機聚合物於不同溫度環境下持溫煅燒一小時後,其性質之變化,最後再以X光繞射分析儀及掃描式電子顯微鏡觀察無機聚合物組成成分及微觀結構之變化。
研究結果顯示:(1)水固比及飛灰取代量與新拌漿體之工作性有密切之關聯,鹼激發量固定為3 %時,流度值隨水固比(0.35至0.40)及飛灰取代量(0 %至50 %)之提升約增加25 %~80 %,凝結時間也得以延長39分鐘~97分鐘,水化溫度相對較低。(2)當飛灰取代為30 %時,試體之抗壓強度約降低19 %,而其他工程性質,超音波波速、動態彈性模數及動態剪力模數皆小幅降低5 %~7 %。(3)提升鹼激發量及降低水固比,皆可使無機聚合物之工程性質上升,但當超過適當範圍時,即易使試體產生脆化易碎等問題。(4)試體之乾燥收縮量皆會因添加飛灰而大幅降低約80 %。(5)添加飛灰會使熱傳導係數產生些微上升,但影響不大。(6)添加細粒料皆可使工程性質及體積穩定性提升,但對其高溫煅燒後之強度及體積穩定性則無明顯幫助。(7)添加飛灰可使試體之高溫煅燒後強度大幅提升,以煅燒溫度400 oC時,效果最為明顯約可提升40 %~60 %,但對於試體之高溫收縮量則無顯著之影響皆為1 %~3 %。(8)掃描式電子顯微鏡結果顯示,添加飛灰於常溫時雖有許多未反應之顆粒,但其於抑制乾縮及裂縫有相當之效果;於高溫之環境下,則因燒結反應而使結構更加緻密,進而有提升強度之效果。
In this study, the sodium hydroxide and sodium silicate were used as the alkali activator to activate the powder activity. Under the condition of fixed modulus of sodium silicate, experimental parameters including different dosages of activator, water-solid ratios, amounts of sand and proportions of slag-fly ash mixtures were used to investigate the effects of various combinations of parameters on the fresh and hardened properties. The second is to investigate the effects of exposure tovarious elevated temperatures for one hour on the properties of of composite geopolymer. Finally, the variations of composition and microstructures of geopolymer were examined by the X-Ray Diffraction analyzer and Scanning Electron Microscopy.
The research results show that: (1) Both the water-solid ratio and the amount of fly ash replacement have close correlation with the workability of fresh paste. At the fixed activator of 3 %, the increases of water-solid ratios from 0.35 to 0.40 and amount of fly ash replacement from 0 to 50 %, the flowability of paste increases by 25 % to 80 %, the setting times extends to 39 to 97 minutes, and the temperature of hydration is relatively lower. (2) When amount of fly ash replacement is 30 %, the compressive strength of specimen decreases about 19 %, other engineering properties, ultrasonic pulse velocity, dynamic elastic modulus and dynamic shear modulus were slightly decreased by 5 % to 7 %. (3) Both the increase of dosages of activator and decrease of water-solid ratio can enhance the engineering properties, but overdosage tends to easily cause the fragile and fragmentation problems. (4) The drying shrinkage of specimens with the addition of fly ash significantly decreases by about 80 %. (5) The addition of fly ash only causes a slight increase of the thermal conductivity (6) The addition of fine aggregates can get better engineering properties and volume stability, but no apparent effects on the strength and volumetric stability exposed to elevated temperatures for one hour. (7) The additon of fly ash can significantly increase the strength of specimen with a best increae of 40 % when the elevated temperature is 400 oC for one hour. (8) The result of SEM indicates that although a large number of unreactive fly ash particles exist at room temperature, they apparently help the suppression of drying shrinkage and crack. The structure of geopolymer becomes denser to enhance the strength of specimen exposed to elevated temperatures.
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