Influence of high temperature on flexural properties and micro structure of steel fiber-polyvinyl alcohol fiber-CaCO3 whisker multi-scale fibers/cement composite

被引：0
|
作者：
Li L. [1 ]
Li Z. [1 ]
Gao D. [2 ]
Cao M. [3 ]
机构：
[1] Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling
[2] School of Civil Engineering, Zhengzhou University, Zhengzhou
[3] Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2021年 / 38卷 / 07期
关键词：
Cement; Fiber reinforced concrete; Flexural strength; Flexural toughness; High temperature; Micro mechanism; Whiskers;
D O I：
10.13801/j.cnki.fhclxb.20200907.001
中图分类号：
学科分类号：
摘要：
In order to promote the engineering application of steel fiber (SF)-polyvinyl alcohol (PVA) fiber-CaCO3 whisker (CW) multi-scale fibers/cement composite, and investigate its fire resistance and high temperature resistance, the flexural properties and microstructure of the SF-PVA-CW multi-scale fibers/cement composite after high temperature were studied. The results show that with the increase of temperature, the residual flexural strength of the SF-PVA-CW multi-scale fibers/cement composite decreases overall, but decreases slowly below 500℃ and the the SF-PVA-CW multi-scale fibers/cement composite with 3vol% CW still increase. The flexural strength decreases sharply at 800℃ and above. The equivalent flexural strength based on JSCE SF4 was used to evaluate the flexural toughness. With the increase of temperature, the equivalent flexural strength of the SF-PVA-CW multi-scale fibers/cement composite decreases gradually. At the temperature up to 500℃, the addition of CW significantly enhances the crack restricting of SF, and the effect of small deflection stage is better than that of large deflection stage. The equivalent flexural strength decreases sharply at 800℃ or above, especially at large deflection stage. With the help of digital camera, optical microscope and SEM, the micro mechanism of the influence of high temperature on the flexural properties of the SF-PVA-CW multi-scale fibers/cement composite was revealed. © 2021, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.
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页码：2326 / 2335
页数：9
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