环境友好型混凝土的抗碳化性能研究  

The Carbonation Resistance of Environmental-friendly Concrete

作　　者：陈明[1] 吴博 叶飞 谭高明 马雪[1] CHEN Ming;WU Bo;YE Fei;TAN Gaoming;MA Xue(School of Materials Science and Engineering,South-west University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学材料科学与工程学院,绵阳621010

出　　处：《玻璃》2022年第4期8-15,共8页Glass

基　　金：四川省教育厅重点项目(17ZA0395);龙山学术人才科研支持计划项目(18LZX609)。

摘　　要：将飞灰、污泥灰等废渣用于制备C30、C60等级环境友好型混凝土,测试了三年龄期混凝土的碳化深度与抗压强度,采用MIP、XRD、SEM-EDS、FT-IR分析了试样孔结构、碳化产物、微观形貌等,探究了环境友好型混凝土长期抗碳化性能及其影响因素,为固体废弃物综合利用提供了数据支撑。结果表明:飞灰用于制备环境友好型混凝土,其抗碳化性能整体较优;降低孔隙率以及细化孔结构将是抑制混凝土碳化的有效方式。水胶比为0.30的CK60试样,孔隙率为4.72%,碳化深度仅为0.7 mm。长龄期条件下,完全碳化区的孔隙率会降低,这是由于大量立方体形貌的CaCO_(3)晶体的形成优化了孔结构。1450 cm^(-1)处O-C-O非对称伸缩吸收峰的峰形变尖锐,峰强变强,与CaCO_(3)衍射峰相对增强的分析结果均证实了CaCO_(3)晶体的形成。Municipal solid waste incineration fly ash(MSWIFA)and sludge ash(SA)were used to prepare the environment-friendly concrete of C30 and C60.The carbonation depth and compressive strength of the 3-year-old concrete were tested.Pore structure,carbonation products and micromorphology of the concrete were analyzed by MIP,XRD,SEM-EDS and FT-IR.The long-term carbonation resistance and its influencing factors of the concrete were investigated,which provided reference for the comprehensive utilization of solid wastes.The results showed that the carbonation resistance of the environment-friendly concrete with the addition of MSWIFA was better.The efficient approaches for inhibiting carbonation of the concrete were both reducing porosity and refining pore structure.The porosity of CK60 with the water-binder ratio of 0.30 was 4.72%,and the carbonization depth was 0.7 mm.Due to the refining pore structure by the large amount of the cubic CaCO_(3) crystals in the long-term age,the porosity of the carbonized zone decreased.The formation of CaCO_(3) crystals was confirmed by the analysis of the sharper and stronger asymmetric stretching peak of O-C-O at 1450 cm^(-1),and the stronger diffraction peak of CaCO_(3).

关 键 词：环境友好 碳化 飞灰 污泥灰 混凝土 

分 类 号：TB321[一般工业技术—材料科学与工程]