聚乙烯纤维增韧高强石膏性能研究

摘要/Abstract

摘要： 为降低高强石膏的脆性,以聚乙烯纤维为增韧材料,通过抗压、三点弯曲、单轴拉伸及吸水率试验,探究聚乙烯纤维掺量对高强石膏性能的影响,并结合SEM对聚乙烯纤维增韧高强石膏微观形貌进行分析,揭示聚乙烯纤维对高强石膏宏观性能的作用机制。结果表明:随着聚乙烯纤维掺量的增加,高强石膏的吸水率增大,抗压强度降低,弯曲强度与拉伸性能呈先减小后增大的趋势;当聚乙烯纤维体积分数达到2.0%时,弯曲强度与拉伸性能提升最为明显,相较于对照组,高强石膏的弯曲强度提升了86.06%,拉伸应变增加了4.45%,极限拉伸应力提高了102.78%。聚乙烯纤维的掺入使得高强石膏表现出了优异的拉伸应变硬化性能,韧性得到显著提高。根据拉伸试验结果,对聚乙烯纤维增韧高强石膏的拉伸应力-应变曲线进行回归分析,建立了拉伸本构模型,可为纤维增韧高强石膏性能分析提供参考。

关键词: 聚乙烯纤维, 高强石膏, 纤维掺量, 力学性能, 微观形貌, 本构模型

Abstract: In order to reduce the brittleness of high-strength gypsum, polyethylene fiber was used as toughening material, the effect of polyethylene fiber content on the property of high-strength gypsum was explored through compressive, flexural, uniaxial tensile and water absorption tests, the microscopic morphology of polyethylene fiber toughened high-strength gypsum was analyzed by SEM, and the mechanism of polyethylene fiber on the macroscopic property of high-strength gypsum was revealed. The results show that with the increase of polyethylene fiber content, the water absorption of high-strength gypsum increases, the compressive strength decreases, and the flexural strength and tensile properties show trend of decreasing first and then increasing. When the volume content of polyethylene fiber reaches 2.0%, the flexural strength and tensile properties are improved most obviously. Compared with the control group, the flexural strength of high-strength gypsum improves by 86.06%, the tensile strain increases by 4.45%, and the ultimate tensile stress increases by 102.78%. The incorporation of polyethylene fiber makes the high-strength gypsum exhibit excellent tensile strain hardening properties and the toughness is significantly improved. Based on the tensile test results, the tensile stress-strain curves of the polyethylene fiber toughened high-strength gypsum are regressed, and the tensile constitutive model is established, which can provide a reference for the property analysis of fiber toughened high-strength gypsum.

Key words: polyethylene fiber, high-strength gypsum, fiber content, mechanical property, microscopic morphology, constitutive model

中图分类号:

TQ177.3⁺2

谭燕, 王程, 龙雄, 周丽君, 严熙, 余江滔. 聚乙烯纤维增韧高强石膏性能研究[J]. 硅酸盐通报, 2025, 44(3): 1011-1020.

TAN Yan, WANG Cheng, LONG Xiong, ZHOU Lijun, YAN Xi, YU Jiangtao. Property of Polyethylene Fiber Toughened High-Strength Gypsum[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 1011-1020.

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