輕質骨材混凝土對二氧化碳吸附之初步探討

A Study on Carbon Dioxide Adsorption of Lightweight Aggregate Concrete

林永值(Yung-Chih Lin)

指導教授 ： 李明君

朝陽科技大學/理工學院/營建工程系/碩士(2014年)

摘要

綠儲碳水泥混凝土(Green concrete: storing carbon dioxide in cement)是2010年度國際知名MIT專家學者票選最重要的10個新興技術名單之一，近年來，氣候變遷與節能減碳，成為全球高度重視之議題，為了打造永續台灣，以綠建築為未來努力的方向，解決環境生態破壞及熱島效應擴張，應進行綠儲碳水泥混凝土相關技術之研發。
研究使用多孔隙透水混凝土和緻密混凝土兩種，配比變數包括以卜作嵐材料(飛灰、水淬爐石粉與矽灰)、MgO粉或橄欖石（oilvine，(MgFe)2SiO4）粉取代10％和30％水泥，依據上述不同比例製成輕質骨材混凝土試體，再進行碳化試驗，以探討各試驗組對於二氧化碳的吸附能力優劣。
試驗結果發現多孔隙透水混凝土和緻密混凝土兩種對於二氧化碳的吸附能力(CO2總重/水泥重量比)差異不大，比較輕質骨材混凝土試體吸附CO2的效果中，以30％取代率之矽灰、水淬爐石粉與橄欖石粉三組較好，其它取代率之卜作嵐摻料次之，MgO組10％與30％取代率皆為不佳。另以5大氣壓100% CO2濃度試驗下，發現其混凝土抗壓強度、吸碳能力與重量明顯提升；顯示壓力、濃度和時間對於輕質骨材混凝土強度與吸附CO2有重要影響。

關鍵字

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並列摘要

Green concrete: storing carbon dioxide in cement, which is part of an annual list of what we believe, is one of the 10 most important emerging technologies 2010 published by MIT in technology review. In recent years, the sustainable and green building techniques have become major topics in Taiwan. The study of green concrete storing carbon dioxide in cement is an important issue in terms of energy saving and carbon reduction, preserving ecological system and mitigating the heat island effect.
In this research, the concrete specimens were mixed and separated into pervious concrete and dense concrete, the mixture design variables including pozzolan materials (fly ash, slag and silica fume), MgO powder or olivine ( (MgFe)2SiO4) powder to replace 10% or 30% of cement weight, based on the above different ratios made of lightweight aggregate concrete specimens. The carbonized trials were tested and evaluated by the following items: setting time, compressive strength and absorbing capacity of carbon dioxide.
The test results showed that the absorbing capacity of carbon dioxide (total CO2 weight / cement weight ratio) in pervious concrete or dense concrete is insignificant. The concrete specimens made with 30% silica fume, 30% slag or 30% olivine showed better adsorption of CO2 than those with other pozzolan admixtures. The concrete specimens made with 10% or 30% MgO group exhibited poor adsorption of CO2. The test results were found that the compressive strength, carbon absorption capacity and weight of concrete specimens improved significantly at 5 atm pressures with 100% CO2 concentration. The atmosphere pressure, CO2 concentration and time have important relationship with strength and adsorption CO2 of lightweight aggregate concrete.

並列關鍵字

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參考文獻

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