Abstract: In order to enhance the self-healing ability of cement-based materials, three different types of mineral admixtures were mixed into mortar to explore the effect of their combined effects. The self-repairing effect of the specimens was evaluated by comparing the width of the cracks, the water permeability and the recovery of compressive strength. The phase composition and microstructure of the self-repairing materials at the cracks were studied by scanning electron microscopy and energy spectrum analysis (SEM-EDS). The addition of composite mineral admixtures can effectively improve the self-healing ability of mortar, which is manifested in the reduction of crack width, reduction of water permeability and remarkable recovery of compressive strength. Among them, the combined admixtures of expansive agent+silica fume+quicklime and expansive agent+quicklime+NaCO3 have the best effect. The crack can be completely healed within 14 d, with the water permeability decreasing by 92.7% and 87.4% respectively, while the compressive strength recovers by 79.1% and 80.1% respectively after curing for 28 d, and the immersion environment is more conducive to improving the self-repair effect. However, expander+silica fume+NaCO3 and expander+metakaolin+NaCO3 have poor repair effect, which is not conducive to the repair of cracks and the recovery of compressive strength. In addition, the micro-analysis results show that the repair materials in the cracks contain not only C-S-H and C-A-H generated by hydration but also calcium carbonate generated by carbonization.
常洪雷, 李晨聪, 王晓龙, 王剑宏, 王云飞, 曲明月, 刘健. 复合矿物掺合料对砂浆自修复性能的影响[J]. 材料导报, 2023, 37(2): 21070177-7.
CHANG Honglei, LI Chencong, WANG Xiaolong, WANG Jianhong, WANG Yunfei, QU Mingyue, LIU Jian. Effect of Composite Mineral Admixtures on Self-healing Properties of Mortar. Materials Reports, 2023, 37(2): 21070177-7.
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2023, Vol. 37 
