Performance Evaluation of Self-healing Capsules Prepared with Polyvinyl Alcohol
CHANG Honglei1, QU Mingyue2, LIU Wei3, CHEN Fanyu2, ZHOU Pengfei3, CHENG Mengying2, LIU Jian1
1 School of Qilu Transportation, Shandong University, Jinan 250002, China 2 School of Civil Engineering, Shandong University, Jinan 250002, China 3 Qilu Transportation Development Group Co. Ltd., Jinan 250101, China
Abstract: 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.
1 Wiktor V, Jonkers H M. Cement and Concrete Composites,2011,33,763. 2 Khaliq W, Ehsan M B. Construction and Building Materials,2016,102,349. 3 Lee B, Hyun J, Kim Y, et al. Materials (Basel),2014,7,5802. 4 Wang J H, Zhang H B, Sang G C, et al. New Building Materials,2012,39(5),32(in Chinese). 王建辉,张浩博,桑国臣,等.新型建筑材料,2012,39(5),32. 5 Wang Y, Li Z G, Luo X G, et al. Concrete,2006(3),91(in Chinese). 王燚,李振国,罗兴国,等.混凝土,2006(3),91. 6 Li V C, Yang E H. Self healing materials, DOI:10.1007/978-1-4020-6250-6. 7 Rooij D M, Tittelboom V K, Belie D N, et al. RILEM State-of-the Art Reports: Self-Healing Phenomena in Cement-Based Materials. Springer, Berlin(Germany),2013,pp.1. 8 Borg R P, Cuenca E, Gastaldo B E M, et al. Journal of Sustainable Cement-Based Materials,2018,7(3),141. 9 Qureshi T, Al-Tabbaa A. Smart Materials and Structures,2016,25(8),1. 10 Ahn T H, Kishi T. Journal of Advanced Concrete Technology,2010,8(2),171. 11 Nagataki S, Gomi H. Cement and Concrete Composites,1998,20,163. 12 Sisomphon K, Copuroglu O, Koenders E A B. Construction and Building Materials,2013,42,217. 13 Park J S, Park J W, Ruckenstein E. Polymer (Guildf),2001,42(9),4271. 14 Chan L W, Hao J S, Heng P W S. Chemical and Pharmacetical Bulletin (Tokyo),1999,47(10),1412. 15 Alghamri R, Kanellopoulos A, Litina C, et al. Construction and Building Materials,2018,186,247. 16 Priest W J. Journal of Applied Polymer Science,1951,6(6),699. 17 Korsmeyer R W, Gurny R, Doelker E, et al. International Journal of Pharmaceutics,1983,15(1),25. 18 Tadros T F. Journal of Colloid and Interface Science,1978,64(1),36. 19 Koo O M Y, Fiske J D, Yang H T, et al. AAPS PharmSciTech,2011,12(2),746. 20 Li W, Yao J W, Jing Y H, et al. Light and Textile Industry and Techno-logy,2019(3),6(in Chinese). 李炜,姚江薇,荆愈涵,等.轻纺工业与技术,2019(3),6.
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2021, Vol. 35 
