| 摘要: |
| 研究了单掺乙烯-醋酸乙烯酯共聚乳胶粉（VAE）和复掺VAE/纳米SiO2（NS）对水泥基材料抗氯离子渗透性能、抗硫酸盐侵蚀性能和吸水率的影响，并通过X射线衍射仪、热分析仪、扫描电子显微镜、压汞仪和红外光谱仪等探究了其作用机理.结果表明：单掺VAE和复掺VAE/NS均可提高材料的抗氯离子渗透性能以及抗硫酸盐侵蚀性能，降低其总吸水率，且复掺效果优于单掺；单掺VAE可以改善材料的水化特性，有害孔和多害孔减少了65.3%，但增大了最可几孔径和界面过渡区的钙硅比；复掺VAE/NS可进一步改善材料的水化特性，有害孔和多害孔减少了82.6%，提高了水化硅酸钙（C-S-H）的生成量和聚合度，增强了材料的耐久性能. |
| 关键词: 纳米SiO2 乙烯-醋酸乙烯酯共聚乳胶粉 氯离子渗透 硫酸盐侵蚀 吸水率 孔结构 |
| DOI：10.3969/j.issn.1007-9629.2023.06.015 |
| 分类号:TU528.31 |
| 基金项目:国家自然科学基金资助项目（51908434）；湖北省教育厅科学技术研究计划项目（Q20191706）；硅酸盐建筑材料国家重点实验室（武汉理工大学）开放基金（SYSJJ2022-20） |
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| Durability of Cement-Based Materials with Nano SiO2 and VAE Composite Modification |
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WANG Zhixin1, MEI Junpeng1,2, LIAO Yishun1,2, LI Hainan3, NIU Yinlong4
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1.School of Urban Construction， Wuhan University of Science and Technology， Wuhan 430065， China;2.Institute of High Performance Engineering Structure， Wuhan University of Science and Technology， Wuhan 430065， China;3.Department of Construction Cost， Wuhan Textile University， Wuhan 430200， China;4.First Engineering Co.， Ltd.， China Construction Third Bureau， Wuhan 430040， China
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| Abstract: |
| The chloride penetration resistance， sulphate erosion resistance and water absorption were used to investigate the effect of single addition of ethylene-vinyl acetate copolymer powder（VAE） and composite addition of VAE/ nano SiO2（NS） on durability of cement-based materials. Attempt was made to explore the influence mechanism of single addition of VAE and composite addition of VAE/NS on the durability of cement-based materials by means of X-ray diffractometer， thermal analyzer， scanning electronic microscope， mercury porosimeter and Fourier transform infrared spectrometer. The results show that both single addition of VAE and composite addition of VAE/NS can improve the chloride penetration resistance and sulfate resistance， and decrease the total water absorption， and the effect of composite addition is better than that of single addition. The single addition of VAE improves the hydration properties， and reduces the harmful and multi-harmful pores by 65.3%， but increases the most probable aperture and the n（Ca）/n（Si） value of interface transition zone. The composite addition of VAE/NS further improves the hydration properties， reduces the harmful and multi-harmful pores by 82.6%， significantly increases the amount of hydrate calcium silicate（C-S-H） generation and the degree of polymerization， and thus enhances the durability of cement-based materials. |
| Key words: nano SiO2 ethylene-vinyl acetate copolymer powder（VAE） chlorine ion penetration sulphate erosion water absorption pore structure |
