水泥基材料自修复颗粒的制备及修复效果事前快速评价方法

doi:10.11896/cldb.23020205

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Abstract Under leakage condition, for most self-healing technologies of cement-based materials, the healing products in cracks will be washed away, and the healing of cracks will be less effective than expected. In this study, by combining the advantages of physical and chemical healing, a type of novel self-healing particle that can quickly and efficiently repair the cracks under the leakage condition was prepared and designed, using chelation super absorbent polymer (C-SAP) as physical healing agent and reactive healing agents (RHA), high performance calcium sulpho aluminate (HCSA) as chemical healing agents. Moreover, home-made water penetration experimental device was modified, the healing efficiency of self-healing particles was evaluated in advance. Finally, X-ray diffraction analysis was performed to detect the composition of healing products. The results showed that the home-made water penetration experimental device can effectively evaluate the self-healing efficiency of the particles before using in cement-based materials, which can quickly optimize the composition of self-healing particles. When m(C-SAP)∶m(RHA)∶m(HCSA)=7.5∶32.5∶60 in the self-healing particles, and the volume content of self-healing particles were 20% and 30%, the cracks with a width at 0.5 mm can be completely blocked at 672 h;when m(C-SAP)∶m(RHA)∶m(HCSA)=10∶30∶60 and the volume content of self-healing particles were 30%, crack with a width at 0.6 mm can be completely blocked at 1 008 h. In early ages of crack healing, the C-SAP de-chelated and then absorbed water and expanded, thus quickly blocked the cracks and reduced water flow. Subsequently, the chemical healing products, such as dolomlite, ettringite and calcite, were generated by chemical reactions to healing the cracks.

Key words： self-healing reactive healing agents super absorbent polymer high performance calcium sulpho aluminate water penetration test device

Published: 10 August 2024 Online: 2024-08-29

CLC number:

TU528

Fund:Key Research and Development Program of Zhejiang Province(2021C01060), Zhejiang Provincial Natural Science Foundation of China(LY22E080014, LY21E080016), and Zhejiang Postdoctoral Science Foundation (ZJ2021126).

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	Articles by authors
	GU Chunping
	SHUANG Yuzhu
	MA Juntao
	ZHOU Yong
	YANG Yang
	LIU Jintao
	JIN Chengyang

Cite this article:

GU Chunping,SHUANG Yuzhu,MA Juntao, et al. Preparation of Self-healing Particles of Cement-based Materials and Rapid Evaluation Method for Their Repair Effect in Advance[J]. Materials Reports, 2024, 38(15): 23020205-6.

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http://www.mater-rep.com/EN/10.11896/cldb.23020205 OR http://www.mater-rep.com/EN/Y2024/V38/I15/23020205

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