SMAF增强PP/PVA混杂纤维工程水泥基复合材料拉伸性能

摘要/Abstract

摘要： 将超弹性形状记忆合金纤维(SMAF)掺入高延性工程水泥基复合材料(ECC)可制得兼具高延性及自恢复性能的新型复合材料SMAF增强ECC(SMAF-ECC)。制备ECC所用的聚乙烯醇(PVA)纤维原材料价格较高,本文采用价格相对低廉的聚丙烯(PP)纤维部分代替PVA纤维制备PP/PVA混杂纤维ECC;再掺入SMAF,制备出SMAF增强PP/PVA混杂纤维ECC,从而实现复合材料成本的降低。为探究该低成本SMAF-ECC是否仍然具备良好的力学性能,论文通过单轴拉伸试验研究不同SMAF掺量和直径下SMAF-ECC的拉伸性能。结果表明:SMAF掺量和直径对SMAF-ECC材料的拉伸性能影响显著;当SMAF直径为0.2 mm、掺量为0.2%(体积分数)时,SMAF-ECC试件拉伸性能最优,相较于ECC试件,SMAF-ECC试件的初裂应力增幅最高为16.79%,极限拉伸应力、应变分别提高了20.85%、2.87%。

关键词: 工程水泥基复合材料, 聚丙烯纤维, 形状记忆合金纤维, 纤维增强, 超弹性, 拉伸性能

Abstract: A new type of composite material SMAF reinforced ECC (SMAF-ECC) with high ductility and self-recovery performance can be prepared by incorporating superelastic shape memory alloy fiber (SMAF) into high ductility engineered cementitious composites (ECC). Due to the high price of polyvinyl alcohol (PVA) fiber raw materials used in the preparation of ECC, this paper used relatively low-cost polypropylene (PP) fiber to partially replace PVA fiber to prepare PP/PVA hybrid fiber ECC. SMAF was added to prepare PP/PVA hybrid fiber ECC reinforced by SMAF, so as to reduce the cost of composite materials. In order to explore whether the low-cost SMAF-ECC still had good mechanical properties, the tensile properties of SMAF-ECC with different SMAF content and diameter were studied by uniaxial tensile test. The results show that the content and diameter of SMAF have a significant effect on the tensile properties of SMAF-ECC. The SMAF-ECC specimens with a diameter of 0.2 mm and a content of 0.2% (volume fraction) show the optimal tensile properties, with an increase of 16.79% in the initial cracking stress, and an increase in the ultimate tensile stress and strain of 20.85% and 2.87%, respectively, in comparison with the ECC specimens.

Key words: engineered cementitious composites, polypropylene fiber, shape memory alloy fiber, fiber reinforced, superelasticity, tensile property

中图分类号:

TU352.1

范淋, 杨曌, 祁小龙, 邓方茜. SMAF增强PP/PVA混杂纤维工程水泥基复合材料拉伸性能[J]. 硅酸盐通报, 2025, 44(3): 811-820.

FAN Lin, YANG Zhao, QI Xiaolong, DENG Fangqian. Tensile Properties of PP/PVA Hybrid Fiber Engineered Cementitious Composites Reinforced by SMAF[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 811-820.

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