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DOE OSTI · 23206293

A high-efficiency self-healing cementitious material based on supramolecular hydrogels impregnated with phosphate and ammonium

Liu, Xiang·Li, Qiu·Li, Bo·Chen, Wei
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Abstract

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.

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36 MATERIALS SCIENCEAPATITESCALCIUM IONSCEMENTSCRACKSEFFICIENCYHEALINGHYDROGELSPHOSPHATESPORIFERAX RADIATION

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Liu, Xiang, Li, Qiu, Li, Bo, Chen, Wei. 2021-06-15. A high-efficiency self-healing cementitious material based on supramolecular hydrogels impregnated with phosphate and ammonium. https://doi.org/10.1016/j.cemconres.2021.106427

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36 MATERIALS SCIENCE↗