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基于有机微胶囊的自愈合水泥基复合材料力学性能与孔隙率的试验研究

Experimental Study on Mechanical Properties and Porosity of Organic Microcapsules Based Self-Healing Cementitious Composite.

作者信息

Wang Xianfeng, Sun Peipei, Han Ningxu, Xing Feng

机构信息

Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China.

出版信息

Materials (Basel). 2017 Jan 1;10(1):20. doi: 10.3390/ma10010020.

DOI:10.3390/ma10010020
PMID:28772382
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5344556/
Abstract

Encapsulation of healing agents embedded in a material matrix has become one of the major approaches for achieving self-healing function in cementitious materials in recent years. A novel type of microcapsules based self-healing cementitious composite was developed in Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University. In this study, both macro performance and the microstructure of the composite are investigated. The macro performance was evaluated by employing the compressive strength and the dynamic modulus, whereas the microstructure was represented by the pore structure parameters such as porosity, cumulative-pore volume, and average-pore diameter, which are significantly correlated to the pore-size distribution and the compressive strength. The results showed that both the compressive strength and the dynamic modulus, as well as the pore structure parameters such as porosity, cumulative-pore volume, and average-pore diameter of the specimen decrease to some extent with the amount of microcapsules. However, the self-healing rate and the recovery rate of the specimen performance and the pore-structure parameters increase with the amount of microcapsules. The results should confirm the self-healing function of microcapsules in the cementitious composite from macroscopic and microscopic viewpoints.

摘要

近年来，将愈合剂包裹在材料基体中已成为实现水泥基材料自愈合功能的主要方法之一。深圳大学滨海土木工程耐久性广东省重点实验室研发了一种新型的基于微胶囊的自愈合水泥基复合材料。在本研究中，对该复合材料的宏观性能和微观结构进行了研究。通过抗压强度和动态模量评估宏观性能，而微观结构则由孔隙结构参数如孔隙率、累积孔隙体积和平均孔径来表征，这些参数与孔径分布和抗压强度显著相关。结果表明，随着微胶囊用量的增加，试件的抗压强度、动态模量以及孔隙率、累积孔隙体积和平均孔径等孔隙结构参数均有一定程度的降低。然而，试件性能和孔隙结构参数的自愈合率和恢复率随微胶囊用量的增加而提高。研究结果从宏观和微观角度证实了微胶囊在水泥基复合材料中的自愈合功能。

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