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研究生:張智傑
研究生(外文):Chih-Chieh Chang
論文名稱:以敲擊回音法檢測混凝土構件於火害後的劣化程度
論文名稱(外文):Using Impact-Echo method to Investigate the Concrete after High-Temperature Exposure
指導教授:鄭家齊鄭家齊引用關係
指導教授(外文):Chia-Chi Cheng
學位類別:碩士
校院名稱:朝陽科技大學
系所名稱:營建工程系碩士班
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:2007
畢業學年度:95
語文別:中文
論文頁數:103
中文關鍵詞:應力波法火害敲擊回音法
外文關鍵詞:High-TemperatureNDTConcrete
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混凝土結構物於火害後由於內部所產生的化學變化,使得混凝土受熱面會產生劣化的現象,本研究的目的是希望能藉由非破壞的方法,利用應力波傳遞的方式檢測火害後的劣化程度。於混凝土表面以鋼珠做敲擊源敲擊,將接收器設置於20cm之距離,以所得到之頻譜中的主要反應頻率,來評估混凝土的劣化程度。
本研究之試體分為兩種,一為大小40*40*15cm之小型混凝土試體,受到火害溫度為300、400、500、600、800℃;另一為大小為240×130×15cm之大型混凝土板,火害溫度為600℃。先以小型混凝土試體利用應力波法作表面頻率量測後再鑽心,劣化深度是由鑽心試體切片之動態彈性模數的差異性判定,以所得之表面頻率與劣化深度做分析,將所得結果驗證至大型混凝土板上探討其是否相關。
由研究結果顯示,於混凝土試體表面以應力波法量測所得到之尖峰振幅頻率最低值若為13~14kHz時,其劣化深度約為2cm;若尖峰的頻率值為11~12 kHz時,其劣化深度約為6~8cm;若尖峰頻率在9~10 kHz時,則劣化深度則約為10cm;若尖峰頻率在7~8kHz時,則劣化深度則約為12~13cm。
The interior chemical reactions produced by fire leads to surface deterioration of structural concrete. The aim of the present research is to evaluate the degree of deterioration non-destructively by means of stress waves. In the study, a steel ball is used as the impactor and the frequency of the principal response obtained by a receiver 20 cm away is used for concrete evaluation.
Two types of specimens were investigated. One is the small specimens with dimensions 40*40*15 cm. These specimens were heated by oven with the temperatures 300, 400, 500, 600, and 800℃. The other is large concrete plate with the size 240*130*15 cm. The specimen is heat by fire with environmental temperature 600℃. The frequencies of the principle responses of the small specimens were compared to the depth of concrete deterioration obtained from drilled core. The cores were sliced into disks and the depth of the deterioration was evaluated by the variation of the dynamic elastic modulus of the disks. The relationship between the lowest primary frequency and the depth of deterioration obtained from the small specimens were used for evaluate the depth of deterioration of the big plate after fire.
The test results show the depths of deterioration are about 2 cm, 6-8 cm, 10cm, and 12-13 cm while the lowest primary frequencies are 13-14 kHz, 11-12 kHz, 9-10 kHz, and 7-8 kHz, respectively.
第一章 緒論 1
1-1 前言 1
1-2 研究動機與目的 1
第二章 文獻回顧 3
2-1 水泥漿體之受熱變化 3
2-2 混凝土於高溫下性質的改變 4
2-2-1 混凝土之化學變化 4
2-2-2 高溫後混凝土裂縫發展 5
2-2-3 延時及升降溫速率之影響 6
2-2-4 高溫後混凝土之波速與殘餘強度關係 6
2-3應力波折射在檢測火害深度之應用 7
2-4混凝土劣化深度與敲擊回音頻譜關係之相關研究 10
2-4-1 兩層複合版 10
2-4-2梳形多重裂縫之混凝土版 12
2-4-3 梳形多重裂縫之兩層複合版 13
2-4-4 混凝土之動彈性模數 13
第三章 檢測原理及儀器設備介紹 15
3-1 敲擊回音檢測原理 15
3-1-1 應力波動行為 15
3-1-2 敲擊回音法之原理(頻譜領域分析法) 18
3-1-3 敲擊回音法之混凝土波速量測 (時間領域分析法) 20
3-1-4 使用可感測敲擊時間原點裝置量測應力波之波速30] 21
3-2 試驗儀器設備 22
第四章 試驗規劃 25
4-1 試體規劃 25
4-2 高溫延燒試驗規劃 26
4-3 混凝土塊之敲擊回音試驗規劃 28
4-4 鑽心驗證 28
第五章 試驗分析結果與討論 30
5-1 小型試塊檢測結果與討論 30
5-1-1不同火害溫度下頻譜檢測結果 30
5-1-3以鑽心試體切片量測之動彈性模數評估混凝土劣化深度 31
5-1-4 以折射定理評估混凝土劣化深度結果 34
5-2 大型版狀試體檢測結果與討論 35
5-2-1 火害後頻譜檢測結果 36
5-2-3 鑽心切片結果 36
5-3 由檢測結果討論頻譜檢測與混凝土劣化之關係 36
第六章 結論與建議 38
6-1 結論 38
6-2 建議 39
參考文獻 40
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