| 摘要: |
| 采用水凝胶为载体，负载磷酸盐以制备修复剂，并将其加入水泥净浆中来制备自修复水泥基材料.利用磷酸盐和裂缝中钙离子原位反应生成羟基磷灰石来修复裂缝，同时探究其修复效率.结果表明：水凝胶能够较好地保存与缓释磷酸盐，在模拟孔溶液环境下，水泥样品表面生成了较为致密的羟基磷灰石；抗氯离子渗透能力可修复60%，裂缝透水率可修复50%～100%；修复产物为碳化缺钙羟基磷灰石（CCDHA）. |
| 关键词: 自修复水泥基材料 水凝胶 羟基磷灰石 修复效率 |
| DOI：10.3969/j.issn.1007 9629.2020.03.004 |
| 分类号: |
| 基金项目:国家自然科学基金委国际（地区）合作与交流项目（中欧）（51611530545）；国防科技创新特区项目 |
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| Study on Self healing Cementitious Materials with Hydrogels Encapsulated Phosphate |
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LI Qiu1, LIU Zhilin2, CHEN Wanyu2, YAO Guangqing2, CHEN Wei1
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1.State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070,China;2.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
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| Abstract: |
| Hydrogels were used as a carrier to encapsulate phosphate and added to cement paste to manufacture self healing cementitious material. Hydroxyapatite type minerals were formed and healed the cracks through the reaction between phosphate released from hydrogels and Ca2+ from the paste. The self healing efficiency was evaluated by the water permeability test and chloride ion penetration test. The results show that the hydrogels successfully preserves the phosphate in the paste and the self healing agent produces dense hydroxyapatite on the specimen in the simulated pore solution. The self healing efficiency is more than 60% on the chloride penetration and 50%100% on the water permeability. The self healing products is carbonated and calcium deficient hydroxyapatite(CCDHA). |
| Key words: self healing cementitious material hydrogel hydroxyapatite self healing efficiency |
