| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Effect of Composite Mineral Admixtures on Self-healing Properties of Mortar |
| CHANG Honglei1, LI Chencong1, WANG Xiaolong1, WANG Jianhong1, WANG Yunfei2, QU Mingyue2, LIU Jian1,*
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1 School of Qilu Transportation, Shandong University, Jinan 250002, China
2 School of Civil Engineering, Shandong University, Jinan 250061, China |
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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.
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Published:
Online: 2023-02-08
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| Fund:Natural Science Foundation of Shandong Province(ZR2019QEE017) and National Natural Science Foundation of China (51908327). |
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Corresponding Authors:
lj75@sdu.edu.cn
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2023, Vol. 37 
