聚甲醛-玄武岩混杂纤维增强砂浆力学性能

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3454-3461.

聚甲醛-玄武岩混杂纤维增强砂浆力学性能

李帅¹, 梅军鹏^1,2,3, 李海南⁴, 戴俊杰¹, 谢安合¹

1.武汉科技大学城市建设学院,武汉 430065;
2.城市更新湖北省工程研究中心,武汉 430065;
3.武汉科技大学高性能工程结构研究院,武汉 430065;
4.武汉纺织大学工程造价系,武汉 430200

收稿日期:2023-05-26 修订日期:2023-07-29 出版日期:2023-10-15 发布日期:2023-10-17
通信作者: 梅军鹏,博士,副教授。E-mail:meijunpeng2006@126.com
作者简介:李帅(1998—),男,硕士研究生。主要从事纤维增强水泥基复合材料方面的研究。E-mail:shuaili02@163.com
基金资助:
武汉理工大学硅酸盐建筑材料国家重点实验室基金(SYSJJ2022-20);武汉科技大学“十四五”湖北省优势特色学科(群)项目(2023D0503,2023D0501)

Mechanical Properties of Polyformaldehyde-Basalt Hybrid Fiber Reinforced Mortar

LI Shuai¹, MEI Junpeng^1,2,3, LI Hainan⁴, DAI Junjie¹, XIE Anhe¹

1. School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China;
2. Hubei Provincial Engineering Research Center of Urban Regeneration, Wuhan 430065, China;
3. Institute of High Performance Engineering Structure, Wuhan University of Science and Technology, Wuhan 430065, China;
4. Department of Construction Cost, Wuhan Textile University, Wuhan 430200, China

Received:2023-05-26 Revised:2023-07-29 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

摘要： 采用混掺聚甲醛(POM)纤维和玄武岩纤维(BF)的方法制备了一种多尺度纤维混杂体系的复合材料,研究了其抗折强度、抗压强度、弯曲韧性及直接拉伸强度等基本力学性能,并通过扫描电子显微镜和数码电子显微镜对其微观结构进行分析。抗折、抗压强度试验结果表明,混掺两种纤维试样的抗折强度和早期抗压强度均明显优于单掺POM纤维试样,然而,28 d抗压强度有小幅下降;三点弯曲试验结果表明,单掺POM纤维可以改善水泥基材料的韧性并提高材料的等效弯曲强度,混掺BF后,等效弯曲强度进一步提高。微观分析结果表明,POM纤维和BF与基体结合紧密,两种纤维在宏观和微观尺度上均起到协同作用,共同发挥阻止裂纹扩展的作用,从而改善水泥基复合材料的韧性并提高强度。

关键词: 聚甲醛纤维, 玄武岩纤维, 力学性能, 水泥砂浆, 混杂纤维

Abstract: A composite of multi-scale fiber hybrid system was prepared by mixing polyoxymethylene (POM) fiber and basalt fiber (BF). The basic mechanical properties, including flexural strength, compressive strength, bending toughness and direct tensile strength were investigated. Microscopic analysis was conducted using scanning electron microscopy and digital electron microscopy. The results of flexural and compressive strength tests show that the flexural strength and early compressive strength of the specimens mixed with two types of fibers are significantly better than those mixed with POM fiber alone, and there is a small decrease in the 28 d compressive strength. The three-point bending test shows that POM fiber alone can improve the toughness of cement-based materials and increases the equivalent flexural strength of the material. After mixing with BF, the equivalent flexural strength is further improved. Microscopic analysis shows that POM fiber and BF are tightly combined with the matrix, and the two fibers can act synergistically at the macro and micro scales, to jointly play a crack resistance effect, improving the toughness and strength of cement-based composite materials.

Key words: polyformaldehyde fiber, basalt fiber, mechanical property, cement mortar, hybrid fiber

中图分类号:

TU528

李帅, 梅军鹏, 李海南, 戴俊杰, 谢安合. 聚甲醛-玄武岩混杂纤维增强砂浆力学性能[J]. 硅酸盐通报, 2023, 42(10): 3454-3461.

LI Shuai, MEI Junpeng, LI Hainan, DAI Junjie, XIE Anhe. Mechanical Properties of Polyformaldehyde-Basalt Hybrid Fiber Reinforced Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3454-3461.

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