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

发布时间：2018-01-10 22:07

本文关键词：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　出处：《硅酸盐学报》2015年08期 　论文类型：期刊论文

【摘要】：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0.55 MPa的CO2气体条件下碳化处理3~9 h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p H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。
[Abstract]:The development of new cement and other low carbon cementitious materials is an effective way to reduce the emission of CO2 in cement industry. By using CO2 curing, the mortar prepared by carbonation active MgO-CaO, fly ash and quaternary cement is accelerated. The effects of carbonation on the mechanical properties and microstructure of mortar were studied by preparing low carbon cementitious material. The results showed that the concentration was 99%. The compressive strength of mortar was increased by 1. 1 ~ 4. 6 times and the carbonization temperature was raised by 1. 1 ~ 4. 6 times after carbonization for 3? 9 h under the condition of CO2 gas with pressure of 0. 55 MPa. Prolonging carbonation time is beneficial to the improvement of mortar strength. After carbonation, a large number of carbonation products, calcium carbonate CaCO3 and calcium magnesium carbonate CaxMg1-xCO _ 3, were produced, which reduced the value of pH of mortar. The number of large pores and the total porosity of mortar samples are decreased obviously.
【作者单位】：南京工业大学材料科学与工程学院材料化学与工程国家重点实验室;先进土木工程材料协同创新中心;
【基金】：江苏省高校自然科学研究项目(14KJB560009) 国家自然科学基金重点项目(51461135003) 江苏省优势学科经费
【分类号】：TQ177.6
【正文快照】： ZHANG Feng1,MO Liwu1,DENG Min1,2(1.State Key Laboratory of Material-Oriented Chemical Engineering,Nanjing Tech University,Nanjing 210009,China;2.The Synergetic Innovation Center for Advanced Civil Engineering Materials,Nanjing 211189,China)开发新型水泥和

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