A high-efficiency self-healing cementitious material based on supramolecular hydrogels impregnated with phosphate and ammonium
A high-efficiency self-healing cementitious material based on supramolecular hydrogels impregnated with phosphate and ammonium
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DOI：
10.1016/j.cemconres.2021.106427
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发表时间：
2021-03-16
影响因子：
11.4
通讯作者：
Chen, Wei
中科院分区：
文献类型：
--
作者：
Liu, Xiang;Li, Qiu;Chen, Wei
介绍了一种以羟基磷灰石为愈合产物的高效自愈合水泥基材料。设计了磷酸盐和氨离子浸渍的超分子水凝胶。用多种分析技术对超分子水凝胶的形态、释磷能力、愈合产物的结构和自愈效率进行了表征。宽度达1 mm的胶凝材料中的裂纹闭合并完全愈合。无铵离子的裂纹愈合产物为具有海绵状形貌的刷石。释放的氨离子与水泥基质中的氢氧化钙反应，使可溶钙离子的浓度增加到参比孔溶液中的300倍。铵离子促进了愈合产物的形成和聚集，并转化为羟基磷灰石，提高了最大可愈合裂缝宽度。
High-efficiency self-healing cementitious materials using hydroxyapatites as healing product were described. Supramolecular hydrogels impregnated with phosphate and ammonium ions were designed. Morphology of the supramolecular hydrogel and its capability to release phosphate in solution, the structure of healing products and the self-healing efficiency were characterized with a range of analytical techniques. Cracks in the cementitious materials with width up to 1 mm are closed and completely healed. The healing product in the cracks without ammonium ions was brushite with a sponge-like morphology. Released ammonium ions reacted with calcium hydroxide in the cement matrix, increasing the concentration of soluble calcium ions up to 300 times that in reference pore solution. Ammonium ions facilitated the formation and aggregation of healing products which were converted into hydroxyapatites, improving the maximum healable crack width.