鹼活化還原碴漿體收縮及抑制方法之研究

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姓名

李宜桃(Yi-Tao Lee) 查詢紙本館藏

畢業系所

土木工程學系

論文名稱

鹼活化還原碴漿體收縮及抑制方法之研究
(Improving the shrinkage of alkali-activated reductive slag)

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摘要(中)

結構物中所使用之水泥是一種高耗能之工業，生產過程中常對環境造成污染，若能尋求良好之替代性材料，以取代水泥之需求，則在環境保護與資源的開發、利用均有正面之幫助。本文主要以電弧爐煉鋼爐碴-還原碴為研究對象，並以完全取代水泥之概念為出發點，運用鹼活化技術提昇還原碴之活性，尋求新世代的膠結材料。根據以往研究指出，添加鹼活化劑之膠結材料，具有較佳之抗壓強度發展、耐久性及抵抗化學侵蝕能力等，但卻常伴隨著速凝、乾縮量過大及鹼質粒料等缺點。
本文主要針對鹼活化還原碴漿體收縮行為機理進行探討與抑制方
法研究。在抑制收縮試驗方面，採用的抑制方法包括添加輸氣劑、減水
劑、降低水膠比、提高養護溫度等。經試驗結果顯示，以添加輸氣劑與
提高養護溫度兩種方式所得之效果最好，但會致使抗壓強度略微下降。
在收縮機理分析方面，配合相關收縮理論與微觀分析，可證實鹼活化還
原碴漿體收縮行為與內部孔隙水發生毛細管冷凝之臨界半徑及孔隙半
徑為1.25 ~ 25 nm之孔隙含量比例有關；當此範圍之孔隙含量比例愈
高，還原碴漿體收縮愈明顯。

摘要(英)

The production of cement is a highly energy-consuming industry. The seeking for an alternative material to take place of Portland cement is always a key research issue. The purpose of this study is to evaluate the potential of electric-arc furnace clinker produced in the steel-making processes – reductive slag as a binging material for concrete. The use of alkali-activator promotes the activity of slag and results in a cementing material of the new era. Previous researcher indicated the alkali-activated slag showed the better compressive strength, durability and resistance to chemical attack. However, some problems such as rapid setting, high shrinkage, and alkali-aggregate reactions may also present .
This study aims at investigating the shrinkage mechanism of alkali-activated reductive slag and developing techniques in restraining the shrinkage of reductive slag. The proposed methods includes the addition of air entraining agent and/or water reducing agent, reduction of water/binder ratio, and elevation of curing temperature. The experimental results showed that the most effective methods were the addition of air entraining agent and the elevation of curing temperature. However, there may be detrimental effects on the compressive strength developments.
It was found that the shrinkage of alkali-activated reductive slag has to do with the critical radius, which is defined as the radius of the pores where capillary condense occurs, and the radius of pore ranging from 1.25 to 25 nm. When the proportion of the pores whose radius in the range of 1.25 ~ 25 nm is higher, the shrinkage of alkali-activated reductive will also be higher.

關鍵字(中)

★ 電弧爐碴
★ 鹼活化劑
★ 收縮
★ 毛細管冷凝

關鍵字(英)

★ electric-arc furnace slag
★ shrinkage
★ alkali-activation
★ capillary condense

論文目次

目錄
目錄 I
圖目錄 V
表目錄 IX
第一章前言 1
1.1研究動機 1
1.2研究目的 1
1.3研究內容 2
第二章文獻回顧 4
2.1電弧爐煉鋼 4
2.1.1電弧爐煉鋼簡介 4
2.1.2 電弧爐煉鋼廢爐碴-還原碴之產量及特性 5
2.2鹼活化劑處理技術 8
2.2.1鹼活化劑之反應機理 8
2.2.2 運用鹼活化技術之優缺點 10
2.2.3 鹼活化還原碴漿體之特性 11
2.3 硬固混凝土收縮行為 14
2.4 收縮機理 16
2.4.1 依體積回復性區分 16
2.4.1.1 可逆收縮 16
2.4.1.2不可逆的收縮 19
2.4.2依混凝土內部組成區分 20
2.4.2.1 C-S-H膠體之特性 20
2.4.2.2 孔隙水與孔隙結構 23
2.4.2.3 孔隙水行為 27
2.5 抑制收縮之方法 30
2.5.1抑制方式-降低水灰比(水膠比)與添加減水劑 30
2.5.2 抑制方式-添加輸氣劑 31
2.5.3 抑制方式-其他藥劑 32
2.5.4抑制方式-高溫處理 34
第三章實驗計畫 37
3.1實驗材料 37
3.2實驗設備及儀器 39
3.3實驗流程及方法 47
3.3.1實驗流程 47
3.3.2實驗方法 52
3.3.3 配比計算 55
第四章結果與分析 58
4.1 還原碴基本性質分析 58
4.1.1 物理性質 59
4.1.2 化學性質 60
4.2 還原碴細度對鹼活化成效之影響 63
4.3 鹼活化活化成效之影響 65
4.3.1強度 65
4.3.2收縮 66
4.4 抑制鹼活化還原碴之收縮 69
4.4.1 添加輸氣劑 70
4.4.1.1添加輸氣劑對收縮之影響 70
4.4.1.2 添加輸氣劑對強度之影響 73
4.4.2 添加減水劑與降低水膠比 76
4.4.2.1添加減水劑與降低水膠比對收縮之影響 76
4.4.2.2 添加減水劑與降低水膠比對強度之影響 79
4.4.3 添加減水劑與輸氣劑 82
4.4.3.1添加減水劑與輸氣劑對收縮之影響 82
4.4.3.2添加減水劑與輸氣劑對強度之影響 85
4.4.4 提高養護溫度 88
4.4.4.1提高養護溫度對收縮之影響 88
4.4.4.2提高養護溫度對強度之影響 91
4.5微觀分析 94
4.5.1 MIP試驗 94
4.5.2 X光繞射分析 100
4.5.3 電子顯微鏡觀測 105
第五章結論與建議 114
5.1 結論 114
5.2 建議 115
參考文獻 116

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指導教授

黃偉慶(Wei-Hsing Huang)

審核日期

2003-6-30

推文