Preparation of Self-healing Particles of Cement-based Materials and Rapid Evaluation Method for Their Repair Effect in Advance
GU Chunping1,2, SHUANG Yuzhu1, MA Juntao1, ZHOU Yong1, YANG Yang1,2,*, LIU Jintao1,2, JIN Chengyang1
1 College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China 2 Zhejiang Key Laboratory of Civil Engineering Structures & Disaster Prevention and Mitigation Technology, Hangzhou 310023, China
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.
作者简介: 顾春平,浙江工业大学土木工程学院副研究员、硕士研究生导师。2008年和2016年于东南大学材料科学与工程专业获学士和博士学位。2016年起在浙江工业大学土木工程学院工作至今。目前主要从事土木工程材料耐久性与体积变形、固废建材化利用、绿色建材等方面的研究工作。发表论文40余篇,包括Journal of Cleaner Production、Construction and Building Materials等。
引用本文:
顾春平, 双雨竹, 马俊涛, 周勇, 杨杨, 刘金涛, 金城阳. 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[J]. 材料导报, 2024, 38(15): 23020205-6.
GU Chunping, SHUANG Yuzhu, MA Juntao, ZHOU Yong, YANG Yang, LIU Jintao, JIN Chengyang. Preparation of Self-healing Particles of Cement-based Materials and Rapid Evaluation Method for Their Repair Effect in Advance. Materials Reports, 2024, 38(15): 23020205-6.
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2024, Vol. 38 
