延遲性鈣礬石形成與鹼-骨材反應引致劣化機制

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郭偉民(Wei-min Kuo) 查詢紙本館藏

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土木工程學系

論文名稱

延遲性鈣礬石形成與鹼-骨材反應引致劣化機制
(The effect of delayed ettringite formation and alkali-silica reaction in concrete)

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摘要(中)

本文探討混凝土產生延遲性鈣礬石形成與鹼-骨材反應的劣化機制，不論延遲性鈣礬石形成或鹼-骨材反應都會使混凝土產生明顯膨脹，自行設計膨脹量試驗，並使用掃描式電子顯微鏡與維區元素分析儀觀察延遲性鈣礬石形成、鹼-骨材反應與兩者並存之試體反應機制。膨脹量試驗使用砂漿棒試體，砂漿棒分別使用標準砂與水泥製作，另一組砂漿棒使用安山岩與水泥製作，並使用不同的實驗條件，如硫含量(0%和5%)與養護溫度(20℃、70℃和85℃)。結果顯示硫含量與養護溫度對於延遲性鈣礬石形成有重大影響，砂漿棒試體在晚期會產生包圍骨材的裂縫引致明顯膨脹，砂漿棒試體同時存在鹼含量、水及反應性骨材會產生鹼-骨材反應。此外，延遲性鈣礬石形成晶體與鹼-骨材反應膠體可以使用掃描式電子顯微鏡與維區元素分析儀進行微觀形貌與化學成分的觀測。

摘要(英)

This paper presents the determination of concrete deterioration, which is contributed by delayed ettringite formation (DEF) and alkali-silica reaction (ASR). The deterioration process of either DEF or ASR is associated with expansion. This paper employed “self-designed expansionary test”, Scanning Electron Microscopy (SEM), and Energy Dispersive Spectrometer (EDS) to observe DEF, ASR, and coupled DEF-ASR reactions mechanisms. The mortar
bars were used in the proposed expansionary test. One kind of mortar bar consisted of standard sand and cement; the other consisted of andesite and cement. Parametric study is also introduced in this paper, all of mortar bars were
placed at different sulfur contents (0% and 5.2%) and various curing temperatures (20℃, 70℃, and 85℃) in experimental conditions. The results show that the curing temperature and sulfur content play important roles for DEF,
which will induce great expansion by many micro-cracks surrounding aggregates at the latter period of mortar age. ASR is based upon the environments of alkali content, water content, and reactive aggregates in mortar bars. Moreover,micro-features and chemical compositions of delayed ettringite crystal and alkali-silica gel can be precisely observed by using SEM and EDS.

關鍵字(中)

★ 延遲性鈣礬石鹼-骨材反應
★ 高溫養護
★ 掃描式電子顯微鏡

關鍵字(英)

★ High Temperature Curing
★ DEF
★ ASR
★ SEM

論文目次

目錄
摘要 ......................................................................................... I
誌謝 ..................................................................................... III
照片目錄 ............................................................................. VII
表目錄 .................................................................................... X
圖目錄 .................................................................................. XI
第一章緒論 .......................................................................... 1
1-1 研究動機 ................................................................................. 1
1-2 研究目的 ................................................................................. 3
1-3 研究方法 ................................................................................. 3
1-4 論文內容與架構 ..................................................................... 4
第二章文獻回顧 ................................................................... 5
2-1 延遲性鈣礬石的發展............................................................. 5
2-2 延遲性鈣礬石形成條件 ........................................................ 6
2-2-1 水泥之硫酸鹽 ................................................................................... 7
2-2-2 微裂縫存在 ....................................................................................... 9
2-2-3 暴露於潮濕的環境 ......................................................................... 10
2-2-4 高溫養護 ......................................................................................... 12
2-3 延遲性鈣礬石晶體形狀 ...................................................... 13
2-4 延遲性鈣礬石的檢測........................................................... 15
2-5 鹼-骨材反應與延遲性鈣礬石 ............................................ 16
2-6 延遲性鈣礬石形成的膨脹機制 .......................................... 17
2-6-1 鈣礬石生長壓力理論 ..................................................................... 18
2-6-2 統一漿體擴充理論 ......................................................................... 19
2-7 掃描式電子顯微鏡原理 ...................................................... 20
第三章實驗規劃與方法 ..................................................... 22
3-1 試驗規劃 ............................................................................... 22
3-2 試驗材料 ............................................................................... 23
3-2-1 水泥 ................................................................................................. 23
3-2-2 骨材 ................................................................................................. 24
3-2-3 硫酸鈉添加劑 ................................................................................. 25
3-3 砂漿棒試體實驗配置........................................................... 26
3-4 砂漿棒試驗儀器與製作步驟 .............................................. 27
3-4-1 製作砂漿棒儀器 ............................................................................. 27
3-4-2 砂漿棒試驗步驟 ............................................................................. 28
3-5 砂漿棒膨脹量量測儀器與步驟 .......................................... 29
3-5-1 砂漿棒膨脹量量測儀器 ................................................................. 29
3-5-2 砂漿棒膨脹量量測步驟 ................................................................. 29
3-6 砂漿棒裂縫密度計算儀器與量測步驟 .............................. 31
3-6-1 砂漿棒裂縫密度計算儀器 ............................................................. 31
3-6-2 砂漿棒裂縫密度量測步驟 ............................................................. 31
3-7 試體裂縫形貌觀測儀器與試驗步驟 .................................. 32
3-7-1 試體裂縫形貌觀測儀器 ................................................................. 32
3-7-2 試體裂縫形貌觀測試驗步驟 ......................................................... 32
3-8 微觀分析試體製作儀器與試驗步驟 .................................. 34
3-8-1 微觀分析試體製作儀器 ................................................................. 34
3-8-2 微觀分析試體製作步驟 ................................................................. 34
3-9 試體微觀分析儀器與試驗步驟 .......................................... 35
4-5-1 試體微觀分析儀器 ......................................................................... 35
4-5-2 試體微觀分析試驗步驟 ................................................................. 36
第四章實驗結果與討論 ..................................................... 37
4-1 試體介紹 ............................................................................... 37
4-2 砂漿棒膨脹量試驗結果 ...................................................... 38
4-3 延遲性鈣礬石引致裂縫密度與膨脹量之關係 .................. 40
4-4 裂縫形貌 ............................................................................... 50
4-5 試體微觀分析結果 ............................................................... 54
4-5-1 試體微觀分析 ................................................................................. 55
第五章結論 ......................................................................... 67
參考文獻 ...............................................................................70

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指導教授

田永銘(Yong-Ming Tien)

審核日期

2012-7-28

推文