Effect of an expansive agent on the interfacial bond and mechanical properties of carbon fibre-reinforced cement-based composites

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2023-11-27 DOI:10.1680/jmacr.23.00098

Jinghui Dai, Jun Wang, Huigang Xiao

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Abstract

Improving the flexural strength of a chopped-carbon fibre-reinforced cement-based composite while promoting good workability is highly attractive for building high-rise large-span structures. This study utilized a sulphoaluminate-based expansive agent to optimize the mechanical properties of chopped-carbon fibre-reinforced cement-based composites by improving the fibre–matrix interfacial properties. The results of a single-fibre pull-out test showed that the interfacial frictional bond strength improved up to 51% owing to the addition of the expansive agent, whereas the chemical debonding energy remained nearly unchanged. The study then investigated the effects of various concentrations of the expansive agent on the strength of the cement paste containing various lengths and volume fractions of the carbon fibre. The results indicated that benefited from the expansive agent induced high interfacial bond strength, the flexural strength and fluidity of the carbon fibre reinforced cement paste could be further optimized. For example, by utilizing expansive agent, the flexural strength could be further improved by 28% for cement paste containing 0.5% carbon fibre with length of 15mm.

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膨胀剂对碳纤维增强水泥基复合材料界面结合及力学性能的影响

在提高剪切碳纤维增强水泥基复合材料抗弯强度的同时，提高其良好的可工作性，对建筑高层大跨度结构具有重要的应用价值。本研究利用硫铝酸盐基膨胀剂，通过改善纤维-基体界面性能来优化碎碳纤维增强水泥基复合材料的力学性能。单纤维拉拔试验结果表明，膨胀剂的加入使界面摩擦结合强度提高了51%，而化学脱粘能基本保持不变。然后，研究了不同浓度的膨胀剂对含有不同长度和体积分数碳纤维的水泥浆体强度的影响。结果表明，得益于膨胀剂诱导的高界面结合强度，碳纤维增强水泥浆体的抗折强度和流动性可进一步优化。例如，添加膨胀剂后，含0.5%碳纤维长度为15mm的水泥浆体的抗折强度可进一步提高28%。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.