期刊
CEMENT & CONCRETE COMPOSITES
卷 57, 期 -, 页码 116-127出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2014.11.014
关键词
Mineral materials; Environmental conditions; Self-healing; Cementitious
资金
- National Basic Research Program of China (973 Program) [2011CB013805]
- National Natural Science Foundation of China [51278360, 51308407]
- National Key Project of Scientific and Technical Supporting Programs of China [2011BAE14806, 2012BAJ20B02]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20130072110047]
- Fundamental Research Funds for the Central Universities
- Collaborative Innovation Center for Advanced Civil Engineering Materials
The effects of the addition of minerals of various compositions (i.e., silica-based materials, chemical expansive agents, swelling minerals and crystalline components) on the self-healing performances of cementitious materials were investigated. The self-healing capabilities were assessed by performing water permeability tests, quantifying the widths of the surface cracks and studying the water absorption of mortars that were pre-cracked by either splitting or compression. The results showed that the cracks that appeared early on healed more efficiently when they were cured in still rather than flowing water. High pHs and high temperatures accelerate crack healing. The healing efficiency can be further improved by utilizing a combination of minerals rather than a single mineral. A self-healing mechanism was discussed by combining these results with micro-observations. The precipitation of calcium carbonate, which is aided by higher pH values and higher calcium ion contents, was found to be the main contributor to the healing of surface cracks. (C) 2014 Elsevier Ltd. All rights reserved.
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