短切芳纶纤维掺量对水泥基复合材料强度和孔结构的影响  

Effect of Cutting Aramid Fiber Content on Strength and Pore Structure of Cement⁃based Composites

作　　者：李紫轩 李地红 卞立波 冯雨琛 张亚晴 于海洋 LI Zixuan;LI Dihong;BIAN Libo;FENG Yuchen;ZHANG Yaqing;YU Haiyang(College of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 102616,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京102616

出　　处：《材料导报》2021年第S02期638-641,共4页Materials Reports

摘　　要：本文研究了不同长度的短切芳纶纤维在不同掺量下对水泥基复合材料抗折强度、抗压强度及微观孔结构的影响。试验结果表明,加入短切芳纶纤维能显著提高水泥基复合材料的准静态力学性能(抗折强度、抗压强度)。长度为1 mm、3 mm的纤维,分别在掺量10 vol%、2vol%时,水泥基复合材料的抗折强度达到峰值;试件的抗压强度,随着纤维掺量的增加,呈现先增大后减小的趋势;此外,随着芳纶纤维掺量的变化,试件的凝胶孔含量、细化孔结构的效果与抗折强度、抗压强度的增减呈现一致性。The effects of chopped aramid fibers with different lengths on the flexural strength, compressive strength and microscopic pore structure of cement-based composites were studied in this paper. The results show that the quasi-static mechanical properties(flexural strength and compressive strength) of cement-based composites are significantly improved by adding chopped aramid fiber. The flexural strength of fibers with length of 1 mm and 3 mm reaches the peak when the content of fibers is 10 vol% and 2 vol%, respectively. The compressive strength of the specimen increases first and then decreases with the increase of fiber content. In addition, with the change of the content of aramid fiber, the gel pore content and the effect of refining pore structure of the specimen are consistent with the increase and decrease of the flexural strength and compressive strength.

关 键 词：短切芳纶纤维 纤维掺量 强度 孔结构 

分 类 号：TB332[一般工业技术—材料科学与工程]