二元体系碱激发胶凝材料抗硫酸盐侵蚀性能研究

作者：Zhang Jielin; Mei Junpeng^*; Li Hainan; Li Yunong; Dong Chong; Wang Zhixin

来源：Journal of Functional Materials, 2023, 54(2): 2197-2203.

DOI：10.3969/j.issn.1001-9731.2023.02.026

• alkali-activated cementitious material
• erosion mechanism
• immersion method
• ratio optimization
• sulfate attack

Fly ash, slag powder, and metakaolin were used as the main raw materials to prepare the binary alkali-activated cementitious materials, and the compound alkali-activated cementitious materials with different proportions were corroded in 5% (NH4)2SO4 solution for 120 days by different immersion methods. The preparation scheme was optimized by measuring its mechanical properties. Then scanning electron microscopy (SEM) was used to analyze the erosion mechanism of different ratios. Results show that the optimal ratio of fly ash-slag powder (FA-SP) is 2:3, and the strength loss is serious under semi-immersion with a large number of cracks and salt crystal. The optimal ratio of metakaolin-slag powder (MK-SP) is 1:1, which has stable structure, unapparent difference in appearance between the semi-immersed group and the full-immersed group. It has good resistance to sulfate corrosion and less erosive by NH+4 ? 2023 Journal of Functional Materials.

• 单位
  武汉科技大学