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| 研究生： |
蘇寶洲 Su, Bao-Jou |
|---|---|
| 論文名稱： |
普蜀蘭反應對碳酸鈣白華之影響機制 Mechanism of pozzolan reaction affecting on the efflorescence in carbonated lime |
| 指導教授： |
王櫻茂
Wang, Ying-Mao |
| 學位類別： |
碩士 Master |
| 系所名稱： |
工學院 - 土木工程學系碩士在職專班 Department of Civil Engineering (on the job class) |
| 論文出版年： | 2002 |
| 畢業學年度： | 90 |
| 語文別： | 中文 |
| 論文頁數： | 100 |
| 中文關鍵詞： | 普蜀蘭反應 、白華 、中性化 |
| 外文關鍵詞： | efflorescence, pozzolan reaction, carbonation |
| 相關次數： | 點閱：85 下載：4 |
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摘 要
關鍵字：白華、中性化、普蜀蘭反應
在我們的居住環境，處處可見斑駁具侵蝕性的白華現象，不但有礙觀瞻，更令人懷疑係偷工減料所致，其之所以會發生，並非台灣地區專屬，而是全世界普遍存在的問題，且截至目前為止尚無根治的特效藥。又現今的混凝土，為了節省經費、提高強度及增加工作性，紛紛添加飛灰或爐石，其對構造物產生的碳酸鈣白華，歷經以EDTA滴定，並輔以X光繞射、掃瞄式電子顯微鏡，再連結酚太測定中性化深度及超音波測定傳遞速度，經過灌置試體24小時拆模，養護24小時，在各項環境變化條件下半浸泡24小時後，得到下列之結果：
1.水灰比W/C=0.4者，摻飛灰之混合水泥，較易產生白華，且隨著摻雜量愈多，則白華生成量愈明顯。
2.相對濕度愈高則白華的產生量愈多。
3.溫度愈高則產生白華量有愈來愈多的趨勢。
4.無論是摻飛灰或爐石之混合水泥，在受風速作用之情形下，其白華的產生量，均較無風速之情況來得嚴重。
5.白華之產生量與中性化深度或超音波之波速尚無絕對的關係。
6.由本次實驗知白華之酸鹼度Ph=11.1±0.23，顯示混凝土已開始中性化，而鋼筋正遂漸膨脹。
7.飛灰或爐石的含量愈多，則白華產生量愈多，所以其最佳含量是愈少愈不會產生白華。
Abstract
Keyword：Efflorescence 、carbonation、pozzolan reaction
Efflorescence, a phenomenon of peeling and corrosion that are not only omnipresent in and around the environment we live, nor exclusive to Taiwan, but also a problem that continues to haunt the world over, noticeably without any permanent cure to date. Moreover, fly ash or slag added to cement in a move to save cost, improve the strength and malleability only excel efflorescence of carbonated lime in building structures, which as assessed by EDTA titration, aided by x-ray diffraction together with x-ray microanalysis, in conjunction with phenolphalein tests for carbonation weighing and ultrasound scanned conveyance rates ，twenty-four hours after pouring, the form was removed and the concrete allowed to set for another 24 hours. The concrete was then dipped halfway and allowed to soak for 24 hours under varying environmental conditions had led to the following findings,
1. Where at a water-cement ratio equals to 0.4, efflorescence in cement mixed with fly ash becomes more omnipresent, the higher the content, the more evident efflorescence will become.
2. At relative humidity the higher , and the more content in efflorescence will become.
3. The higher temperature,and the more in efflorescence of content had become increasingly tendency.
4. Cement batch, irrespective of mixing with fly ash or slag, has a noticeably more severe condition of efflorescence accelerated by wind drafts than that without wind drafts.
5. No correlation was established in terms of the amount of efflorescence to the level of carbonation or the oscillation patterns in the ultrasound scan.
6. The experiment also concluded that at a ph rating of 11.1 plus/minus 0.23 detected in efflorescence indicates the concrete has begun to carbonate and the rebar within begun to expand and deteriorate.
7. The higher the content of fly ash or slag, the greater the efflorescence. Thus the ideal mix will contain less fly ash and slag and produce less efflorescence.
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校內：立即公開校外：2002-08-02公開