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高浓度二氧化碳碳化活性氧化镁水泥浆体的显微结构

DOI: 10.7521/j.issn.0454-5648.2014.02.3

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Abstract:

活性MgO水泥是一种低碳胶凝材料,通常由大量工业废渣、适量活性氧化镁及少量的水泥制备而成。与传统水泥不同,活性MgO水泥经碳化后产生较好的力学性能。研究了由20%~40%活性MgO、0~40%矿粉及水泥配制的活性MgO水泥浆体在浓度为99.9%的CO2中养护不同龄期后的微观结构。采用动态水蒸气吸附法、二次扫描电子显微分析和背散射电子显微分析等方法对碳化水泥浆体微观结构进行了表征,并讨论了碳化机理。结果表明水化硅酸钙碳化生成无定形的CaCO3及SiO2,从而使水泥浆体中0~11nm介孔略有增加、比表面积增大;经碳化后,活性MgO水泥浆体生成了大量紧密连接的圆形Mg-Ca碳酸盐,使水泥浆体微观结构更致密。CO2养护过程中,活性MgO水泥的碳化产物主要通过含Ca2+和Mg2+饱和溶液中沉淀结晶而形成。

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