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

IF 1.3 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Advances in Cement 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。

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来源期刊

Advances in Cement Research 工程技术-材料科学：综合

CiteScore

3.70

自引率

5.00%

发文量

审稿时长

3.2 months

期刊介绍： Advances in Cement Research highlights the scientific ideas and innovations within the cutting-edge cement manufacture industry. It is a global journal with a scope encompassing cement manufacture and materials, properties and durability of cementitious materials and systems, hydration, interaction of cement with other materials, analysis and testing, special cements and applications.