纳米SiO2与VAE复合改性水泥基材料的耐久性能

作者：Wang Zhixin; Mei Junpeng^*; Liao Yishun; Li Hainan; Niu Yinlong

来源：Journal of Building Materials, 2023, 26(6): 687-696.

DOI：10.3969/j.issn.1007-9629.2023.06.015

• chlorine ion penetration
• ethylene?vinyl acetate copolymer powder（VAE）
• nano SiO2
• pore structure
• sulphate erosion
• water absorption

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. ? 2023 Tongji University.

• 单位
  武汉科技大学