Ion chelating agent can effectively improve the self-healing of concrete. In order to further enhance the self-healing ability of cement-based materials, ion chelating agent and inorganic compounds (sodium silicate and sodium bicarbonate) were used together in this paper. Pore size distribution, mechanical and self-healing performance of the mortars with ion chelating agent and inorganic compounds were investigated. The results showed that harmful pores (pore diameter above 0.1 μm) of the mortar was reduced and mechanical properties was increased by adding ion chelating agent and inorganic compounds, especially mortar mixed with 0.50% ion chelating agent and 0.25% sodium silicate had the least harmful pores and the highest compressive strength and flexural strength. Moreover, the self-healing properties of mortars were significantly improved by combination of ion chelating agent and inorganic compound. Especially for mortar mixed with 0.5% ion chelating agent and 0.5% sodium silicate, the relative water permeability coefficient decreased to 0 after curing for 28 d, and the cracks with width of 0.31 mm and 0.46 mm could be completely closed after curing for 3 d and 28 d respectively. SEM observation showed that the calcium carbonate, ettringite and calcium carbonate were covered by CSH gel in the cracks and interior of the mortar mixed with ion chelating agent and sodium silicate, which proved that the ion chelating agent and sodium silicate had synergistic effect on the self-healing properties of cement-based materials.

离子螯合剂可有效改善混凝土的自愈性。为了进一步增强水泥基材料的自愈能力，本文将离子螯合剂和无机化合物（硅酸钠和碳酸氢钠）一起使用。研究了含离子螯合剂和无机化合物的砂浆的孔径分布，力学性能和自修复性能。结果表明，有害的孔（孔径超过0.1 μ通过添加离子螯合剂和无机化合物可以降低砂浆的m）并提高机械性能，特别是掺有0.50％离子螯合剂和0.25％硅酸钠的砂浆有害孔最少，压缩强度和弯曲强度最高。此外，通过结合使用离子螯合剂和无机化合物，砂浆的自愈性能得到了显着改善。特别是对于掺有0.5％离子螯合剂和0.5％硅酸钠的砂浆，固化28 d后相对透水系数降至0，固化3 d后宽度为0.31 mm和0.46 mm的裂纹可以完全封闭。和28 d。扫描电镜观察表明，碳酸钙