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研究生:陳青豪
研究生(外文):Ching-Hao Chen
論文名稱:含飛灰TAICON混凝土高溫延時與解熱回復性質之研究
論文名稱(外文):The Effect of Exposed Duration of High Temperature and Recovery Duration of Heat Release on TAICON with Fly Ash
指導教授:沈得縣沈得縣引用關係
指導教授(外文):Der-Hsien Shen
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:營建工程系
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:1999
畢業學年度:87
語文別:英文
論文頁數:175
中文關鍵詞:TAICON混凝土飛灰高溫延時回復
外文關鍵詞:TAICONfly ashhigh temperatureexposed durationrecovery duration
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含飛灰TAICON混凝土高溫延時與解熱回復性質之研究
指導教授:沈得縣 博士
研 究 生:陳青豪
摘要
本研究係探討「高溫延時」與「解熱回復」對含飛灰TAICON混凝土力學性質與行為之影響,並探討高溫作用後再水化之機理。
研究結果顯示:在高溫延時之影響上,由於含飛灰TAICON混凝土單位用水量較普通混凝土少,且於56天後波索蘭反應逐漸發揮,使其緻密性、強度及體積穩定性均較普通混凝土高,因此產生較少之孔隙、收縮膨脹及重量損失。此外,含飛灰TAICON混凝土在高溫作用及高溫延時後其強度折減均較普通混凝土低,故含飛灰TAICON混凝土較普通混凝土具有較佳之耐高溫性能。
在解熱回復之影響上,由於含飛灰TAICON混凝土單位水泥含量較低,且飛灰之波索蘭反應在早期速率較慢,於56天後始逐漸發揮,故回復期30~90天強度成長速率較0~30天時快;且於回復30天時,因CaO吸水膨脹產生裂縫而導致力學強度降低,但60天以後逐漸回升,而受750℃高溫作用之混凝土在回復90天時其抗壓強度約可回復至原有強度之50﹪,但於回復時,含飛灰TAICON混凝土之孔隙填補能力、力學強度回復效率卻較普通混凝土低。
關鍵字:TAICON混凝土、飛灰、高溫、延時、回復。
The Effect of Exposed Duration of High Temperature and Recovery Duration of Heat Release on TAICON with Fly Ash
Thesis Advisor: Der-Hsien Shen
Graduate Student: Ching-Hao Chen
ABSTRACT
This Study is to investigate the effects of〝Exposed Duration of High Temperature〞and〝Recovery Duration of Heat Release〞on mechanical properties and behaviors of TAICON with fly ash. An analysis on the high temperature properties and rehydration mechanism on TAICON with fly ash is also conducted.
The study results show that in the effect of exposed duration of high temperature, it''s compactness, strength, and dimension stability are higher than those of ordinary concrete, because water demand for TAICON with fly ash is less than that for ordinary concrete and it''s pozzolanic reaction is developing after 56 days. Therefor, it has less porosity, less shrinkage, less expansion, and less of weight loss. In addition, the strength reduction for TAICON with fly ash is less under high temperature action and exposed duration of high temperature. So the high temperature resistance of TAICON with fly ash is better than ordinary concrete.
In the effect of recovery duration of heat release, since cement content of TAICON with fly ash is lower and the pozzolanic reaction develops slower in it''s early stage of 56 days, the growth rate of 30-90 days recovery is faster than that of 0-30 days recovery, on the 30th day of recovery, it''s mechanical strength is reduce to expansion and cracking of absorbing water by CaO, but increase after 60 days, subject to 750℃, the compressive strength can recover to 50﹪on the 90th day of recovery. However, during recovery, TAICON''s pore filling ability and mechanical strength recovery is lower than those of ordinary concrete.
Keywords: TAICON, fly ash, high temperature, exposed duration, recovery duration.
目錄
中文摘要I
英文摘要II
誌謝III
目錄IV
圖目錄VIII
表目錄XVII
第一章 緒論1
1-1 研究動機1
1-2 研究目的2
1-3 研究範圍2
1-4 研究方法與進行步驟2
第二章 文獻回顧4
2-1 TAICON 混凝土4
2-1-1 TAICON混凝土之定義4
2-1-2 TAICON混凝土之緣起4
2-1-3 TAICON混凝土之發展與應用5
2-2 水泥漿體之熱學性質6
2-2-1 水泥之成份及熱學性質6
2-2-2 水泥漿體微觀結構之熱學性質8
2-2-3 水泥漿體之受熱變化12
2-3 骨材之熱學性質13
2-3-1 骨材在高溫下之體積變化13
2-3-2 骨材熱學性質對混凝土性質之影響14
2-4 飛灰之作用機理14
2-4-1 飛灰之成份14
2-4-2 飛灰於水泥漿體內之作用機理16
2-4-3 飛灰對混凝土性質之影響16
2-5 混凝土之熱學性質17
2-5-1 比熱17
2-5-2 熱膨脹19
2-5-3 熱傳導22
2-5-4 熱擴散率25
2-5-5 化學變化26
2-6 混凝土火害後之性質變化28
2-6-1 昇降溫速率及延時對混凝土性質之影響28
2-6-2 加壓形態對混凝土強度之影響29
2-6-3 高溫作用對混凝土性質之影響31
2-6-4 解熱後混凝土性質之回復39
2-6-5 混凝土之爆裂與剝落43
第三章 試驗計劃45
3-1 試驗流程45
3-2 試驗材料45
3-3 試驗變數與試體編號48
3-3-1 試驗變數48
3-3-2 試體編號48
3-4 試驗方法與設備50
3-4-1 材料基本性質試驗50
3-4-2 混凝土性質試驗52
3-4-3 試驗設備53
3-5 試驗配比54
第四章 試驗結果分析與討論63
4-1 高溫作用對含飛灰TAICON混凝土物理性質之影響63
4-1-1 尺寸變化63
4-1-2 重量變化74
4-1-3 溫度分佈80
4-2 高溫延時對含飛灰TAICON混凝土力學性質之影響86
4-2-1 殘餘抗壓強度86
4-2-2 殘餘劈張強度98
4-2-3 殘餘動彈性模數106
4-3 解熱回復對含飛灰TAICON混凝土力學性質之影響114
4-3-1 殘餘抗壓強度114
4-3-2 殘餘劈張強度122
4-3-3 殘餘動彈性模數126
4-4 高溫作用對含飛灰TAICON混凝土微觀性質之影響130
4-4-1 孔隙指數130
4-4-2 超音波速率138
4-4-3 SEM晶相觀測151
第五章 結論與建議157
5-1 結論157
5-2 建議161
參考文獻163
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