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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/69350


    Title: 地質處置場封填用低鹼度膠結材配方及特性研究
    Authors: 林均霖;Lin,Jyun-Lin
    Contributors: 土木工程學系
    Keywords: 低鹼度膠結材;低鹼度水泥;鈣矽比;卜作嵐反應;氫氧化鈣;low-pH cementitious materials;low-pH cement;Ca/Si raito;Pozzolanic Reaction;portlandie
    Date: 2016-01-28
    Issue Date: 2016-03-17 18:39:51 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 使用卜特蘭水泥建造放射性廢棄物地下處置場時,會釋放高鹼的孔隙溶液其pH值介於12-13,在高pH值的情況下將提高風險性,並增強氫氧化物的溶解及對膨潤土回脹功能的損害, 因此需使用低鹼膠結材透過卜作嵐反應消耗孔隙溶液中之氫氧化鈣(CH),藉以降低孔隙溶液pH值,以確保緩衝材料之安全性。
    本研究以摻配低鹼膠結材取代卜特蘭水泥的方式,藉以降低孔隙溶液pH值並針對工作性、耐久性、體積穩定性作評估,並搭配微觀分析X射線繞射分析(XRD)在固定矽灰用量40%下,發現使用爐石配比中在初期水化產物仍有氫氧化鈣的存在,而使用熱重分析(TGA)檢視氫氧化鈣含量(CH)與孔隙溶液pH對應的關係,可發現單純使用卜特蘭水泥時,於90天時仍然有大量的氫氧化鈣存在,而使用低鹼膠結材之配比能有降低氫氧化鈣含量進而影響孔隙溶液pH值,最後利用掃描式顯微鏡SEM與能量散射光譜儀EDS分析檢視水化產物結構與鈣矽比與pH值對應之關係。
    研究結果顯示,由工作性、耐久性與體積穩定性結果評估,可得知在相同矽灰40%用量下,以孔隙溶液pH值來說燃煤飛灰取代將優於爐石,而就工作性及耐久性方面則為爐石取代優於燃煤飛灰,因此就其用量建議矽灰用量固定40%,爐石及飛灰則建議用量為10-20%,以避免摻配過量造成不良的影響。而設計低鹼度水泥時,建議取代卜特蘭水泥40%以上與材料總矽含量達55%以上,將有助於孔隙溶液pH值達目標值,在各種性能評估結果後,建議採用卜特蘭水泥與單一系統取代(矽灰)為最佳。
    ;Using Portland cement to build radioactive waste underground disposal site, will release high-pH pore fluid which pH value is between 12 and 13. In this kind of high-pH condition, the dissolvability of hydroxides will highly increase, and lead to the damage of the swelling ability of bentonite EBS. So, to insure the safety of buffer material, the low-pH cementitious materials is needed to consume the Ca(OH)2 in pore fluid through the Pozzolanic reaction.
    In this research the low-pH cementitious materials is used to replace the Portland cement to reduce the pH value of pore fluid and evaluate its workability, durability and the stability of volume. With XRD analysis, Ca(OH)2 has been found in early hydration products in blast furnace slag group with 40% Silica fume content. Using low-pH cementitious materials in Portland cement, the Ca(OH)2 content and pH value can be reduced effectively. At the end, determinate the relationships between consist of hydration, Ca / Si ratio and pH value with SEM and EDS analysis.
    The result shows that at the 40% Silica fume content, the pH value in the fly ash group is lower than the blast furnace slag group, but the workability and durability is better in the blast furnace slag group. To maintain its workability and durability, the 40% Silica fume content and 10-20% fly ash and blast furnace slag content are suggested. In low-pH cement design, to obtain the expected pH value, the replacement of Portland cement should more than 40% and the total Silicon content should more than 55%. The Silica fume single replacing system is the most suggested when the workability, stability of volume and durability are considered.
    Appears in Collections:[土木工程研究所] 博碩士論文

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