低放射性廢棄物最終處置場回填材料長期穩定性之研究

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陳憶婷(I-Ting Chen) 查詢紙本館藏

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土木工程學系

論文名稱

低放射性廢棄物最終處置場回填材料長期穩定性之研究

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摘要(中)

在低放射性廢棄物最終處置場的服務期間長久，而混凝土和回填材料介面的交互作用時間是連續且長久，長期下來接觸介面的交互作用以及未來地下水的入侵，皆會造成回填材料內部微結構和障壁功能的改變，直接影響到原本預期的材料特性。
本研究內容主要分為兩個階段，在第一階段有兩個部分，第一部份以電滲加速試驗模擬處置場在長久未飽和狀態下，模擬混凝土襯砌及回填材料介面的交互作用，混凝土分別選用一般混凝土及低鹼混凝土，比較不同混凝土對回填材料的影響，回填材料是以 Volclay SPV 200 膨潤土取代 50 % 重量百分比的粒料；，以低鹼性混凝土作為混凝土襯砌，回填材料分別以膨潤土取代50% 及 30% 的粒料，比較碎石粒料的添加比例是否能減少混凝土對回填材料的影響。第二部份，以回脹壓力與水力傳導試驗針對處置場在飽和狀況下，了解地下水化學及pH值效應對電滲後回填材料回脹行為之影響。
研究結果顯示，在未飽和環境下混凝土襯砌與回填材料相互接觸經電滲加速試驗後，混凝土中鈣離子將會釋出，使得與其接觸的回填材料由接觸面開始，其鈣鈉比升高、pH值降低，且普通混凝土對回填材料的影響較低鹼性混凝土大。在飽和環境下，電滲後回填材料於NaCl 與 CaCl2 環境下，回脹壓力隨著陽離子濃度提升而降低，其中NaCl效應下對回脹壓力影響較大。電滲後回填材料於 pH值＜13 溶液中，對回脹壓力沒有明顯影響；當回填材料於高鹼系統中，高濃度氫氧根離子入侵至膨潤土內部，造成蒙脫石溶解，導致回脹壓力永久性降低。

摘要(英)

Both concrete and backfill serve as engineered barriers for isolation of low-level radioactive wastes in a repository for radioactive wastes. As the disposal site is expected to serve a very long time, the interactions between the two barriers need to be evaluated under the potential unsaturated/saturated situations. This study aims at simulating the long-term scenario of engineered barrier materials and the corresponding effects of the scenario on the expected function of barrier materials in a final disposal site for low-level radioactive wastes.
In this research, a migration technique was applied to accelerate the migration of calcium ions from the pore solution of concrete so as to investigate the alteration of compacted bentonite in contact with the concrete. The backfill material was prepared by mixing 30-50% of Black Hills bentonite from Wyoming with 50-70% of Taitung area argillite to produce different ratios of sand-bentonite mixture as backfill. And the barrier concrete is a low-pH concrete having a binder comprised of 60% cement and 40% silica fume. After the migration test, backfill material was tested for swelling pressure to evaluate the effects of long-term contact. Finally, concrete barrier and backfill were both subjected to extended unsaturated situation as well as saturated situation for further evaluation. The backfill was treated with groundwater permeated through the concrete after the migration test so as to simulate the sequence of unsaturated and saturated scenarios that are expected to be experienced. Also, concrete barrier and backfill were both subjected to extended unsaturated situation as well as saturated situation for further evaluation. The backfill was treated with groundwater chemistry, pH environment after the migration test so as to simulate the sequence of unsaturated and saturated scenarios that are expected to be experienced. Results from the study show:(1) It was found from the accelerated migration test that the release of calcium from concrete in unsaturated situation results in reduction of swelling capacity of the contacting buffer. The shorter the distance to the interface, the more the increases in the ratio of calcium to sodium content in the backfill material, and the swelling pressure decreased as well. (2) in NaCl and CaCl2 solution, the swelling pressure of bentonite decreases with increasing cation concentration, and the effect of NaCl on swelling pressure is more pronounced; (3) at solutions with pH < 13, no significant reduction on swelling pressure was observed; (4) as illustrated by ICP analysis, backfill in NaOH [1.0M] solution shows decreases in montmorillonite and quartz minerals, while the Si4+ ions exhibits obvious increase.

關鍵字(中)

★ 回填材料
★ 回脹壓力
★ 回脹行為
★ 未飽和/飽和處置環境

關鍵字(英)

★ backfill material
★ swelling pressures
★ swelling behavior
★ unsaturated/saturated situations

論文目次

摘要 I
Abstract III
致謝 V
目錄 VI
圖目錄 XII
表目錄 XVIII
第一章研究動機 1
1.1研究動機 1
1.2研究目的 3
1.3研究方法與範圍 3
第二章文獻回顧 5
2.1低放射性廢棄物來源 5
2.1.1低放射性廢棄物分類標準 5
2.2低放射性廢棄物處置現況 8
2.2.1國外低放射性廢棄物處置現況 8
2.2.2國內低放射性最終處置場設計概念 14
2.3 處置場近場環境的演化 19
2.3.1 初始未飽和狀態 19
2.3.2 長久未飽和狀態 19
2.3.3 飽和狀態 21
2.4 膨潤土基本特性 22
2.4.1 膨潤土礦物的結晶構造 22
2.4.2 膨潤土與水的作用 23
2.4.3 分散與凝絮結構 24
2.4.4 pH值對膨潤土結構效應 25
2.5 回填材料所需具備之功能 25
2.6 回填材料與混凝土障壁接觸之交互作用 27
2.6.1 離子交換 27
2.6.2 離子交換之因素 28
2.6.3 回填材料與混凝土之交互作用 29
2.7 擴散雙層理論 33
2.7.1電解質濃度及離子價數對擴散雙層厚度之影響 35
2.7.2 pH值對擴散雙層厚度之影響 36
2.7.3陽離子水化半徑對擴散雙層厚度之影響 36
2.8膨潤土回脹行為 37
2.8.1壓實膨潤土之結構 37
2.8.2膨潤土定體積回脹行為 38
2.9 國外最終處置場近場環境分析 40
2.9.1地下水化學效應對回脹壓力之影響 40
2.9.2 pH值效應對回脹壓力之影響 43
第三章研究計畫 47
3.1研究內容與架構 47
3.2 試驗材料 49
3.2.1 Volclay SPV200 膨潤土 49
3.2.1.1 膨潤土基本物理分析 50
3.2.1.2 膨潤土化學性質分析 52
3.2.2 台東硬頁岩 56
3.2.2.1台東硬頁岩物理性質分析 56
3.3電滲加速試驗 58
3.3.1電滲加速試驗之試體製作 58
3.3.2 混凝土襯砌試體製作 62
3.3.2.1 普通混凝土 (OPC) 62
3.3.2.2 低鹼性混凝土 (Low-pH Concrete) 63
3.3.3電滲加速試驗方法 64
3.4回脹壓力與水力傳導試驗 66
3.4.1回脹壓力與水力傳導試驗之試體製作 67
3.4.2 回脹壓力與水力傳導試驗方法 69
3.4.3定體積回脹壓力試驗 70
3.4.4 水力傳導試驗 73
3.5 物理性質分析方法 74
3.5.1 回脹潛能試驗 74
3.6化學性質分析方法 75
3.6.1 pH 值測量 75
3.6.2 化學成分分析 76
3.6.3 陽離子定量分析 ( ICP ) 76
3.6.4 XRD 繞射分析 77
3.6.5 SEM 掃描式電子顯微鏡 78
第四章結果與分析 79
4.1未飽和環境下之模擬 79
4.1.1 電流量測 80
4.1.2 回脹潛能 81
4.1.3 pH值量測 83
4.1.4 陽離子交換容量分析 85
4.1.5 X光繞射分析 88
4.2 飽和環境下之模擬 92
4.2.1 經電滲後不同回填材料之回脹行為 – 回脹壓力試驗 93
4.2.1.1 不同混凝土襯砌與回填材料相互接觸後 – 試驗結果 93
4.2.1.2 不同回填材料配比與混凝土相互接觸後 – 試驗結果 95
4.2.1.3 水力傳導試驗 96
4.2.2 地下水化學效應-回脹壓力試驗結果 97
4.2.2.1 不同陽離子效應對回脹壓力之影響 102
4.2.2.2 陰離子效應對回脹壓力之影響 104
4.2.2.3 陽離子交換容量分析 105
4.2.2.4 SEM分析 108
4.2.3pH值效應-回脹壓力試驗結果 112
4.2.3.1 試體外觀分析 116
4.2.3.2 陽離子可交換容量分析 119
4.2.3.3 SEM分析 122
第五章結論與建議 125
5.1 結論 125
5.2 建議 127
參考文獻 129

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指導教授

黃偉慶

審核日期

2017-1-23

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