Efficiency of self-healing cementitious materials with encapsulated polyurethane to reduce water ingress through cracks

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2018-05-17 DOI:10.3989/MC.2018.05917

B. V. Belleghem, K. Tittelboom, N. Belie

引用次数: 16

Abstract

Cracks in reinforced concrete elements can cause major durability issues due do the accelerated ingress of aggressive substances. In this study, repair of cracks was addressed by incorporating encapsulated polyurethane based healing agents in the cementitious material as an autonomous healing mechanism. Capillary sorption tests showed that a high viscosity healing agent could reduce the water ingress in cracked mortar, but a large scatter in the results was found, resulting in a large range of healing efficiencies (18 – 108%). The low viscosity polyurethane showed a more complete and consistent crack healing. Healing efficiencies ranging from 95 to 124% were observed (crack width up to 295 μm). The proposed healing mechanism is very effective in blocking the ingress of water. This will enhance the durability of cementitious materials and consequently extend their lifetime.

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包封聚氨酯自修复胶凝材料减少裂缝进水的效率

由于侵蚀性物质的加速进入，钢筋混凝土构件中的裂缝可能会导致重大的耐久性问题。在这项研究中，通过在胶结材料中加入包封的聚氨酯基愈合剂作为一种自主愈合机制来修复裂缝。毛细管吸附试验表明，高粘度愈合剂可以减少开裂砂浆中的水分进入，但发现结果存在很大的分散性，导致愈合效率范围很大（18-108%）。低粘度聚氨酯显示出更完整和一致的裂纹愈合。观察到愈合效率在95%至124%之间（裂纹宽度高达295μm）。所提出的愈合机制在阻止水进入方面非常有效。这将提高胶结材料的耐久性，从而延长其使用寿命。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.