蒸汽養護對鹼-骨材反應之影響

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邱薰頤(Hsun-I Chiu) 查詢紙本館藏

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論文名稱

蒸汽養護對鹼-骨材反應之影響
(The Influence of Steam Curing on Alkali-Aggregate Reaction)

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摘要(中)

本研究為探討蒸汽養護對鹼-骨材反應之影響，採集海岸山脈安山岩與花蓮和平溪骨材，利用蒸汽養護方式進行ASTM C227與ASTM C1293試驗。主要討論下列各項因素對鹼-骨材反應之影響：（1）鹼含量；（2）蒸汽養護；（3）端面束制；（4）前置期。
由試驗結果發現，海岸山脈安山岩與和平溪之骨材皆有鹼-骨材反應潛能，試體之總鹼含量越高則膨脹量越大。混凝土於蒸汽養護過程中將使膨脹量在早期即被激發，減緩晚期膨脹量之發生，使試體膨脹應變量小於未進行蒸汽養護之試體，且表面裂縫與反應膠體數量較少，由此可知蒸汽養護對減緩混凝土之鹼-骨材反應有一定之成效。若仿照一般預鑄廠之施作方式，將混凝土連同模具一併進行蒸汽養護，則端面束制之試體膨脹量明顯小於非端面束制之試體，而蒸汽養護之前置時間越長，則水化作用較完全，試體膨脹量亦較小，可降低混凝土構件因鹼-骨材反應所引致之膨脹量。

摘要(英)

This study is mainly discussing how the steam curing affects on the Alkali-Aggregate Reaction. Andesite from the coastal range and aggregate of Heping River were used in the trial of ASTM C227and ASTM C1293 via the progress of steam curing. The four factors were discussed on the affects of the Alkali-Aggregate Reaction: (1)alkali content; (2)steam curing; (3)constrained end; (4)delay period.
The result of this study is that both of the andesite from the coastal range and the Aggregate of Heping River have the potential to represent the Alkali-Aggregate Reaction. IF the percentage of alkali content is higher, the scale of expansion would be larger. If the concrete made by either andesite from the coastal range or the Aggregate of Heping River were treated with steam curing, the expansion in the early stage would be stimulated rapidly, and the expansion of the latter stage would be suspended, allowing the overall scale of expansion to be smaller than the non-steam cured specimen. On the other hand, there would be less crack and reactive gel in the specimen treated with steam curing. So it is obvious to conclude that the steam curing can effectively reduce the Alkali-Aggregate Reaction in concrete. By imitating the methods of making concrete in the pre-casting factories, that is, allowing the concrete along with the patterns to be treated with steam curing, the scale of expansion of the constrained end in the specimen would be smaller than the scale of expansion of the non-constrained end. And if the delay period of the steam curing is longer, the scale of expansion of the specimen would be smaller. In that way, the scale of expansion in the concrete structure induced by the Alkali-Aggregate Reaction would be reduced.

關鍵字(中)

★ 鹼-骨材反應
★ 蒸汽養護
★ 前置期
★ 端面束制

關鍵字(英)

★ Delay Period
★ Constrained End
★ Steam Curing
★ Alkali-Aggregate Reaction

論文目次

摘要 I
ABSTRACT II
誌謝 III
目錄 IV
圖目錄 VIII
表目錄 XV
照片目錄 XVI
第一章　緒論 1
1-1 研究動機 1
1-2 研究目的 2
1-3 研究範圍及方法 3
1-4 論文架構 3
第二章　文獻回顧 6
2-1 鹼-骨材反應（Alkali-Aggregate Reaction；AAR） 6
2-2 鹼-骨材反應的分類 6
2-2-1 鹼-氧化矽反應（Alkali- Silica Reaction；ASR） 6
2-2-2 鹼-碳酸鹽反應（Alkali-Carbonate Reaction；ACR） 7
2-2-3 鹼-矽酸鹽反應（Alkali-Silicate Reaction） 8
2-3 鹼-骨材反應之機制 8
2-3-1 鹼-骨材反應機制 8
2-3-2 鹼-骨材反應的過程 11
2-4 鹼-骨材反應的特徵 13
2-4-1 外觀方面 13
2-4-2 內部方面 15
2-5 鹼-骨材反應造成之危害 17
2-6 悲極值（pessimum）之探討 17
2-6-1 悲極值（pessimum） 17
2-6-2 造成悲極值存在之因素 19
2-6-2-1 反應性骨材含量 19
2-6-2-2 反應性骨材粒徑 20
2-6-2-3 鹼量 20
2-6-2-4 卜作嵐材料之添加量 20
2-7 裂縫觀察與量測 21
2-7-1 人工描繪 21
2-7-2 顯微鏡 22
2-7-3 紫外線螢光樹脂輔以UV 光法 23
2-7-4 Underwood 合金輔以影像分析 24
2-7-5 超音波檢測法 26
2-8 抑制鹼-骨材反應的方法 27
2-9 加速養護方式 30
2-10 蒸汽養護各階段的條件限制 31
2-11 蒸汽養護特點 34
2-12 蒸汽養護對混凝土性質之影響 34
第三章　試驗計畫與方法 42
3-1 試驗規劃 42
3-2 試驗材料 44
3-3 試驗儀器與設備 47
3-3-1 試驗儀器 47
3-3-2 蒸汽養護設備 52
3-3-3 榮工處中壢預鑄廠之蒸汽養護設備 56
3-4 試驗方法與步驟 57
3-4-1 鹼-骨材反應潛能之水泥砂漿棒試驗
（ASTM C227 Mortar BarTest） 57
3-4-1-1 儀器與條件 57
3-4-1-2 試驗步驟 59
3-4-1-3 試驗配比 63
3-4-2 混凝土角柱膨脹試驗法
（ASTM C1293 Concrete Prism Test） 65
3-4-2-1 儀器與條件 65
3-4-2-2 試驗步驟 66
3-4-2-3 試驗配比 68
3-4-3 超音波檢測法 70
第四章　試驗結果與分析 71
4-1 鹼含量對試體膨脹量之影響 71
4-1-1 水泥砂漿棒膨脹試驗（ASTM C227） 71
4-1-2 混凝土角柱膨脹試驗（ASTM C1293） 72
4-1-3 鹼含量對超音波速之影響 73
4-1-4 綜合討論 74
4-2 蒸汽養護與標準環境對試體膨脹量之影響 81
4-2-1 養護條件 81
4-2-2 蒸汽養護與標準環境之試體膨脹量比較 84
4-2-3 蒸汽養護與標準環境之試體劣化行為 94
4-2-4 蒸汽養護與標準環境之試體超音波速比較 99
4-2-5 綜合討論 99
4-3 端面束制與非端面束制對試體膨脹量之影響 101
4-3-1 束制條件 101
4-3-2 端面束制與非端面束制之試體膨脹量比較 103
4-3-3 端面束制與非端面束制之試體超音波速比較 104
4-3-4 綜合討論 105
4-4 前置期對膨脹量之影響 111
4-4-1 前置期條件 111
4-4-2 前置期對試體膨脹量之影響 113
4-4-3 前置期對超音波速之影響 115
4-4-4 綜合討論 115
第五章　結論與建議 129
5-1 結論 129
5-2 建議 131
參考文獻 132

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指導教授

田永銘(Yong-Ming Tien)

審核日期

2006-7-21

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