Performance Evaluation of Self-healing Capsules Prepared with Polyvinyl Alcohol

被引：0
|
作者：
Chang H. [1 ]
Qu M. [2 ]
Liu W. [3 ]
Chen F. [2 ]
Zhou P. [3 ]
Cheng M. [2 ]
Liu J. [1 ]
机构：
[1] School of Qilu Transportation, Shandong University, Jinan
[2] School of Civil Engineering, Shandong University, Jinan
[3] Qilu Transportation Development Group Co. Ltd., Jinan
来源：
Cailiao Daobao/Materials Reports | 2021年 / 35卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Capsule wall; Capsules; Performance evaluation; Polyvinyl alcohol film; Self-healing;
D O I：
10.11896/cldb.20030109
中图分类号：
学科分类号：
摘要：
It is an effective method to realize self-healing of cement-based materials by adding capsules containing repairing agent. In order to grasp the basic properties of polyvinyl alcohol (PVA) as the capsule wall material, and to explore the chemical stability, hardness, water resistance and distribution of capsules, this study not only evaluated the apparent solubility, expansion performance and hygroscopic of three types of PVA films, but also characterized the basic properties of the capsules prepared by optimized PVA. The results show that PVA film can maintain stability in high pH environment, and its apparent solubility, swelling index and water permeability decrease with the increase of solution mass fraction. From the comprehensive consideration of performance and cost, GC2-P is the most cost-effective, and GC2-P with a mass fraction of 5% is more suitable as the capsule wall material of capsules. The capsules prepared based on this PVA have a certain hardness and good water resistance, which can ensure the integrity of the capsules incorporated into the material matrix and the effectiveness of the repairing agent before cracks appear; and the capsules with the particle size of 0.5-4 mm are evenly distributed in the matrix and crack in time after the cracks appear, which is suitable for the long-term effective repair of the microcracks in the cement matrix. © 2021, Materials Review Magazine. All right reserved.
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页码：6212 / 6218
页数：6
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