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改性聚乙烯醇纤维对超高性能混凝土的影响及其增强机理

Influence of Modified PVA Fiber on Ultra-High Performance Concrete and Its Enhancing Mechanism.

作者信息

Chen Zhiyuan, Fan Hongyu, Zheng Wanying, Zhang Siheng, Wu Xi, Fu Tengfei, Yu Demei

机构信息

College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China.

Department of Civil Engineering, Hangzhou City University, Hangzhou 310015, China.

出版信息

Polymers (Basel). 2024 Dec 9;16(23):3449. doi: 10.3390/polym16233449.

DOI:10.3390/polym16233449
PMID:39684193
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11644703/
Abstract

In this study, the properties of ultra-high-performance concrete (UHPC) were enhanced by adding modified polyvinyl alcohol (PVA) fibers. The specimens with different curing ages were evaluated in various aspects to investigate the effects of different dosages, lengths, and surface treatments of PVA fibers on the performance of UHPC. The performance was compared with that of steel fiber-reinforced UHPC with the same ratio and multiple dosages. At the same time, the distribution of fibers and the morphology of fibers were observed by a scanning electron microscope, and the mechanism of fiber reinforcement was discussed. The results showed that the mechanical properties were significantly affected by the fiber dosage, length, and surface treatment. Based on the test results, the optimum PVA fiber addition can increase the compressive strength and flexural strength by 12.0% and 6.0% compared to the control UHPC without fibers. A comprehensive evaluation was carried out and indicated that the optimum PVA fiber addition has the potential to replace 0.5% steel fiber in certain conditions.

摘要

在本研究中，通过添加改性聚乙烯醇（PVA）纤维提高了超高性能混凝土（UHPC）的性能。对不同养护龄期的试件进行了多方面评估，以研究PVA纤维不同掺量、长度和表面处理对UHPC性能的影响。将其性能与相同比例和多种掺量的钢纤维增强UHPC的性能进行了比较。同时，通过扫描电子显微镜观察了纤维的分布和形态，并探讨了纤维增强机理。结果表明，纤维掺量、长度和表面处理对力学性能有显著影响。基于试验结果，与无纤维的对照UHPC相比，最佳PVA纤维掺量可使抗压强度和抗弯强度分别提高12.0%和6.0%。进行了综合评估，结果表明在某些条件下，最佳PVA纤维掺量有可能替代0.5%的钢纤维。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bc94/11644703/cfe364c1a4c3/polymers-16-03449-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bc94/11644703/5c00f7617ded/polymers-16-03449-g009.jpg
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