Effect of low temperature and moisture on bond properties of PVA fibres and engineered cementitious composite matrix

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2023-01-01 DOI:10.1680/jadcr.22.00003

Shuling Gao, Qing Wang

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引用次数: 2

Abstract

The chemical debonding energy, initial interfacial frictional bond strength and slip-hardening coefficient between polyvinyl alcohol (PVA) fibres and an engineered cementitious composite (ECC) matrix were obtained by means of single PVA fibre pull-out tests. The effect of three moisture states (fully saturated, semi-saturated and fully dry) on the bonding properties between the PVA fibre and ECC matrix at three target temperatures (25°C, 0°C and −20°C) was investigated. It was found that, at 25°C, the bonding properties decreased with an increase in moisture content. At 0°C and −20°C, the bonding properties increased with an increase in moisture content. At −20°C in the fully saturated state, the bonding load was too large to cause fibre rupture. The bonding properties were found to increase with decreasing temperature in the fully saturated and semi-saturated states and decrease with decreasing temperature in the fully dry state. This study of the effect of low temperature and moisture state on the bonding properties between PVA fibres and ECCs provides theoretical support for how to ensure good ductility when ECCs are in service at low temperature.

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低温、低温对聚乙烯醇纤维与工程胶凝复合材料粘结性能的影响

通过单根聚乙烯醇(PVA)纤维的拔出试验，获得了聚乙烯醇(PVA)纤维与工程胶凝复合材料(ECC)基体之间的化学脱粘能、初始界面摩擦结合强度和滑移硬化系数。在25°C、0°C和- 20°C三个目标温度下，研究了三种水分状态(完全饱和、半饱和和完全干燥)对PVA纤维与ECC基体粘合性能的影响。结果表明，在25℃时，粘结性能随含水率的增加而降低。在0°C和- 20°C时，粘结性能随含水率的增加而增加。在- 20℃的完全饱和状态下，粘接载荷过大，导致纤维断裂。在全饱和和半饱和状态下，粘结性能随温度的降低而升高，在全干燥状态下，粘结性能随温度的降低而降低。研究低温、湿态对聚乙烯醇纤维与ECCs粘结性能的影响，为ECCs在低温下使用时如何保证良好的延展性提供理论支持。

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.