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碳化MgO-CaO-粉煤灰-水泥四元组分制备砂浆的强度和微观结构

DOI: 10.14062/j.issn.0454-5648.2015.08.03

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Abstract:

开发新型水泥和其它低碳胶凝材料是水泥工业CO2减排的有效途径。采用CO2养护,加速碳化活性MgO、CaO、粉煤灰和水泥四元组分配制的砂浆,制备低碳胶凝材料,研究碳化对砂浆力学性能和微观结构的影响。结果表明在浓度为99%、压力为0.55MPa的CO2气体条件下碳化处理3~9h后,砂浆抗压强度提高了1.1~4.6倍。提高碳化温度、延长碳化时间均有利于砂浆强度的提高,且温度对砂浆强度的提高影响更为显著。碳化后生成大量碳化产物碳酸钙CaCO3和碳酸钙镁CaxMg1-xCO3,使得砂浆pH值降低、试件更加致密,砂浆试件中大孔数量明显减少,总孔隙率显著降低。

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