| 研究生: |
曾子彥 Zeng, Zi-Yan |
|---|---|
| 論文名稱: |
以浸泡方式加速混凝土中性化反應之研究 Study of accelerating carbonation on concrete by using soak method |
| 指導教授: |
王櫻茂
Wang, Ying-Mao |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2002 |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 69 |
| 中文關鍵詞: | 超音波 、中性化 |
| 外文關鍵詞: | carbonation, ultra sonic |
| 相關次數: | 點閱:42 下載:2 |
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摘要
台灣環境污染嚴重,而環境因素對於混凝土耐久性影響甚巨。在耐久性的研究中,混凝土中性化是近幾年來國內外學者研究的重點,然而研究方法多以氣體侵入加速居多。本研究期望以浸泡侵蝕加速模擬水污染的方式,在短時間內獲得長時間暴露的結果,進而評估混凝土以浸泡侵蝕加速與氣體侵入加速的關係。本研究製作普通混凝土(Normal Weight Concrete,NWC)ψ5.5×12cm,改變其水灰比、養護條件、溫度、乾濕循環等條件,做8週的加速。
分成三種不同的加速方式如下:
1.浸泡碳酸水溶液
2.浸泡碳酸氫鈉飽和溶液
3.二氧化碳氣體加速
每隔一定時間量測超音波波速評估其動彈性係數,再做劈裂試驗得到試體的劈裂強度,最後配合SEM晶相觀測瞭解微結構的變化。
試驗結果如下:
1.相同的加速時間內,以氣體侵入的中性化深度最大,浸泡碳酸氫鈉次之,而浸泡二氧化碳水溶液的速度則非常緩慢。
2.以超音波波速來看,浸泡加速與氣體侵入加速兩種不同類型的方法都可很明顯看出與中性化速度成反比。
3.以劈裂強度來看,氣體侵入加速的方法都可看出與中性化速度成反比。但是以浸泡加速的數據差異性非常高,劈裂強度跟中性化速度的的關係十分薄弱。
Abstract
Problems of environmental pollution in Taiwan is very critical,and it can influence on durability of concrete.In studies of durability,the internal and external scholars concentrate in the study of carbonation of concrete in recent years,and they use the method of diffusion to accelerate mostly.Howeve,this study attempt to use soak method to speed up carbonation and imitat water pollution to get the long run result of carbonation in a short-term and assess the relationship between acceleration of diffusion and soak in carbonate solution osmotic action further.
In this study,we made NWC(Normal Weight Concrete)ψ5.5×12cm,and varied water-cement ratios,curing condition,temperature and perform dry-wet circulation during eight weeks.
The accelerating terms are as follows:
1.Soaked in carbonated water.
2.Soaked in saturated solution of sodium bicarbonate.
3.Diffusin of carbon dioxide accelerated, .
In each cycle, we investigated the mass change , strength change with UST ,cleavage strength of cement and micro structure change with SEM.
The test results are as follows:
1.In the same accelerated times,the carbonation depths of carbon dioxide accelerated were maximum,soaked in saturated solution of sodium bicarbonation were next,and soaked in carbonated water were minimum.
2.In UST,we can see both two methods had an inverce ratio between carbonation rate and speed of ultra sonic.
3.We can see both two methods had an inverce ratio between carbonation rate and cleavage strength.
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