氧化铝纤维掺量及长度对混凝土力学性能和微观结构的影响

摘要/Abstract

摘要： 氧化铝纤维(AOF)是一种新型多晶陶瓷纤维材料,具有较好的亲水性。以AOF为改性材料,制备了氧化铝纤维改性混凝土(AOFMC),通过测试AOFMC的抗压强度、抗折强度和劈拉强度,分析了AOF掺量和长度对混凝土力学性能的影响,确定了AOF的最佳掺量和长度。在此基础上,研究了AOF对不同强度等级混凝土(C40、C50、C60)力学性能的增强作用。此外,结合扫描电子显微镜和压汞试验,分析了AOF对混凝土微观结构的影响。结果表明:AOF掺量和长度对混凝土力学性能的提高效果相互制约,当AOF长度为12 mm、体积掺量为0.2%时,AOFMC的力学性能最佳;随着强度等级的增大,AOF对混凝土力学性能的提高效果不断增大;AOF与混凝土基体结合良好,从而提高了混凝土的力学性能;在C50混凝土中,AOF主要被拔出,而在C60混凝土中,AOF部分被拉断;当AOF长度较小时,AOF可以填充混凝土内部孔隙。

关键词: 混凝土, 氧化铝纤维, 长度, 掺量, 力学性能, 微观结构

Abstract: Aluminium oxide fiber (AOF) is a new type of polycrystalline ceramic fiber material with good hydrophilicity. Aluminium oxide fiber modified concrete (AOFMC) was prepared by using AOF as modified material. By testing AOFMC compressive strength, flexural strength and splitting tensile strength, the effects of AOF content and length on the mechanical properties of concrete were analyzed, and the optimum content and length of AOF were determined. On this basis, the strengthening effect of AOF on the mechanical properties of concrete with different strength grades(C40, C50, C60) was studied. In addition, the effects of AOF on the microstructure of concrete were analyzed by scanning electron microscopy and mercury intrusion test. The results show that the effect of AOF content and length on the improvement of mechanical properties of concrete is mutually restricted. When the length of AOF is 12 mm and the volume content is 0.2%, the mechanical properties of AOFMC are the best. With the increase of strength grade, the improvement effect of AOF on the mechanical properties of concrete is increasing. AOF is well combined with concrete matrix, thus improving the mechanical properties of concrete. In C50 concrete, AOF is mainly pulled out, while in C60 concrete, AOF is partially pulled off. When the length of AOF is small, AOF can fill the internal pores of concrete.

Key words: concrete, aluminium oxide fiber, length, content, mechanical property, microstructure

中图分类号:

TU528

吕圆芳, 闫铁成, 杨永东, 卢同平. 氧化铝纤维掺量及长度对混凝土力学性能和微观结构的影响[J]. 硅酸盐通报, 2024, 43(8): 2871-2878.

LYU Yuanfang, YAN Tiecheng, YANG Yongdong, LU Tongping. Effects of Aluminium Oxide Fiber Content and Length on Mechanical Properties and Microstructure of Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2871-2878.

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