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玻璃纤维和高性能聚丙烯纤维增强超高性能混凝土的力学性能及损伤演化

The Mechanical Properties and Damage Evolution of UHPC Reinforced with Glass Fibers and High-Performance Polypropylene Fibers.

作者信息

He Jiayuan, Chen Weizhen, Zhang Boshan, Yu Jiangjiang, Liu Hang

机构信息

Department of Bridge Engineering, Tongji University, Shanghai 200000, China.

Shandong Hi-Speed Company Limited, Jinan 250000, China.

出版信息

Materials (Basel). 2021 May 9;14(9):2455. doi: 10.3390/ma14092455.

DOI:10.3390/ma14092455
PMID:34065146
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8125961/
Abstract

Due to the sharp and corrosion-prone features of steel fibers, there is a demand for ultra-high-performance concrete (UHPC) reinforced with nonmetallic fibers. In this paper, glass fiber (GF) and the high-performance polypropylene (HPP) fiber were selected to prepare UHPC, and the effects of different fibers on the compressive, tensile and bending properties of UHPC were investigated, experimentally and numerically. Then, the damage evolution of UHPC was further studied numerically, adopting the concrete damaged plasticity (CDP) model. The difference between the simulation values and experimental values was within 5.0%, verifying the reliability of the numerical model. The results indicate that 2.0% fiber content in UHPC provides better mechanical properties. In addition, the glass fiber was more significant in strengthening the effect. Compared with HPP-UHPC, the compressive, tensile and flexural strength of GF-UHPC increased by about 20%, 30% and 40%, respectively. However, the flexural toughness indexes , and of HPP-UHPC were about 1.2, 2.0 and 3.8 times those of GF-UHPC, respectively, showing that the toughening effect of the HPP fiber is better.

摘要

由于钢纤维具有尖锐且易腐蚀的特性，因此对用非金属纤维增强的超高性能混凝土（UHPC）有需求。本文选用玻璃纤维（GF）和高性能聚丙烯（HPP）纤维制备UHPC，并通过实验和数值模拟研究了不同纤维对UHPC抗压、抗拉和弯曲性能的影响。然后，采用混凝土损伤塑性（CDP）模型对UHPC的损伤演化进行了进一步的数值研究。模拟值与实验值的差异在5.0%以内，验证了数值模型的可靠性。结果表明，UHPC中2.0%的纤维含量能提供更好的力学性能。此外，玻璃纤维在增强效果方面更显著。与HPP-UHPC相比，GF-UHPC的抗压、抗拉和抗弯强度分别提高了约20%、30%和40%。然而，HPP-UHPC的弯曲韧性指标 、 和 分别约为GF-UHPC的1.2倍、2.0倍和3.8倍，表明HPP纤维的增韧效果更好。

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