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  • 學位論文

特殊混凝土對二氧化碳的吸附能力之探討

Study on Carbon Dioxide Adsorption of Special Concretes

指導教授 : 王韡蒨 李明君
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摘要


本研究以I型水泥、固井水泥、無機聚合物及輕質氣泡混凝土製作成正方形5×5×5試體,將四種新拌成型之水泥漿試體和水泥砂漿試體迅速拆模,放入高壓二氧化碳氣體環境下進行加速養護試驗,探討特殊混凝土對二氧化碳的吸附能力,試驗總共分成子流程A與子流程B兩階段實驗。 子流程A以水泥漿試體為主,以四種水泥製作正方形水泥漿試體,將試體放入高壓CO2氣體環境進行養護,觀察試體在四種壓力、三種CO2濃度、三種時間下的試體重量變化,計算各試體內的C3S及C2S含量,推測試體理想情況時可吸附多少的二氧化碳,並比較實驗中各試體實際所吸附的CO2重量進行碳足跡歷程比較,最後進行XRD成分分析。結果顯示四種水泥吸附二氧化碳的效果好壞依序為:I型水泥、固井水泥、輕質氣泡混凝土、無機聚合物,結果顯示在各壓力下、CO2濃度100 %、加壓時間180分時試體的重量增幅最大,經XRD分析試體表面生成大量碳酸鈣結晶使試體重量增加,但水泥試體吸附CO2氣體的效果遠低於水泥的二氧化碳排放量,最後選擇I型水泥與固井水泥與CO2吸附能力較佳之水泥作為子流程B砂漿材料 子流程B利用I型及固井水泥製作水泥砂漿試體,探討在三種加壓壓力、四種CO2濃度、三種時間的環境變數下,比較兩種砂漿試體與CO2氣體反應後的CaCO3結晶增重與抗壓強度間的關係,並比較兩種試體在不同齡期下石灰水養護之抗壓強度高低,再以中性化試驗觀察試體的碳化深度,最後利用SEM試驗分析試體表面的結晶物結構變化。結果顯示,固井水泥試體產生的結晶增重低於I型水泥,但整體抗壓強度卻大於I型水泥,而固井水泥在石灰水養護7天後的強度便高於I型水泥。由SEM試驗觀察試體表面結晶物,大部分結晶物以0.1~0.2 μm的尺寸組成,當試體表面的結晶物尺寸越小,試體強度越高,但因試體接觸的CO2濃度及反應時間不足,C-S-H矽鈣膠體生成速率大於CaCO3碳化速率,導致試體中性化試驗後的碳化深度皆為0公分。

並列摘要


Type I Portland cement, oil well cement, geopolymer and ALC (autoclaved lightweight concrete) were used to make both cement paste cubes and mortar cubes in this study. Removal the form immediately after each kind of specimens grout into three 5 cm x 5 cm x 5 cm cubes. Then, put the specimens into the pressure vessel which inject the high carbon dioxide gas that could run absorption and curing tests. In order to investigate the behavior of carbon dioxide adsorption and curing of special concretes, the experiment is divided into the part A and B test. Part A is mainly to produce cement paste cubes. These cubes were cured in high carbon dioxide pressure environment and observed the weight change in different pressure, concentration and time. The C3S and C2S content in each specimen were calculated and speculated how much CO2 weight could absorb into cubes. Comparison of the total weight of carbon dioxide process with carbon footprint on experiment specimens were adsorbed and run the XRD test at last. The CO2 adsorption capacity results of four cements in sequence are type I cement, oil well cement, ALC and geopolymer. These cubes under 100% CO2 concentration and 180 minutes curing have large weight increase. The results from the XRD analysis show a lot of calcium carbonate crystallization on these cube surfaces which might cause weight increase. However, weight of CO2 adsorption by the above cubes is far lower than their CO2 emissions of cement. At last, both type I Portland cement and oil well cement holding good carbon dioxide adsorption capacity were selected to run the part B test. Part B using type I Portland cement and oil well cement to make the cement mortar cubes. The relationships between compressive strength and crystallization mass gain after reacting with CO2 were compared to cure in lime water with different ages. The neutralization tests were conducted to measure the carbonation depth, compressive strength and analysis the calcium carbonate crystallization structure of cube surface by using SEM test. The results show that the crystallization weight of oil well cement specimen was less than type I cement, but the compressive strength of oil well cement greater than type I cement. Most of calcium carbonate crystallization size is 0.1~0.2 μm in SEM test and their crystals composed by the smaller particle size let the strength increase. The production rate of C-S-H gel was greater than calcium carbonate due to CO2 reaction time and concentration limitation, and it caused the specimen without any carbonation depth.

參考文獻


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被引用紀錄


黃毅瑋(2016)。高壓環境混凝土對二氧化碳的吸附能力初步探討〔碩士論文,朝陽科技大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0078-1108201714034218
鄧嘉倫(2016)。新拌混凝土碳儲存技術之初步研究〔碩士論文,朝陽科技大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0078-1108201714030562

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