纺织学报 ›› 2021, Vol. 42 ›› Issue (10): 53-60.doi: 10.13475/j.fzxb.20201104208

• 纤维材料 • 上一篇    下一篇

改性聚乙烯醇纤维增强水泥基复合材料制备及其力学性能

魏发云1,2, 杨帆3, 王海楼3, 于斌1, 邹学书3, 张伟3()   

  1. 1.浙江理工大学 纺织科学与工程学院(国际丝绸学院), 浙江 杭州 310018
    2.南通大学 杏林学院,江苏 南通 226236
    3.南通大学 纺织服装学院, 江苏 南通 226019
  • 收稿日期:2020-11-19 修回日期:2021-06-03 出版日期:2021-10-15 发布日期:2021-10-29
  • 通讯作者: 张伟
  • 作者简介:魏发云(1983—),女,副教授,博士。主要研究方向为纤维改性及其应用技术。
  • 基金资助:
    国家重点研发计划项目(2016YFB0303101);国家自然科学基金青年科学基金项目(11802144);江苏高校“青蓝工程”资助项目(苏教师函〔2020〕10号)

Preparation and mechanical properties of cementitious composites reinforced by modified polyvinyl alcohol fiber

WEI Fayun1,2, YANG Fan3, WANG Hailou3, YU Bin1, ZOU Xueshu3, ZHANG Wei3()   

  1. 1. College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Xinglin College, Nantong University, Nantong, Jiangsu 226236, China
    3. School of Textile and Clothing, Nantong University, Nantong, Jiangsu 226019, China
  • Received:2020-11-19 Revised:2021-06-03 Published:2021-10-15 Online:2021-10-29
  • Contact: ZHANG Wei

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摘要：

为提高聚乙烯醇(PVA)纤维与水泥基体间的界面强度,采用化学接枝法在PVA纤维表面接枝一层纳米二氧化硅颗粒(SiO2 NPs),制备改性PVA纤维增强水泥基复合材料(PVA-FRCC)。通过三点弯曲试验测试改性前后PVA-FRCC的抗弯强度,并研究纤维铺排方向和层数对水泥基复合材料抗弯性能的影响。结果表明:纤维交叉铺排时,PVA-FRCC的抗弯强度优于纵向和横向铺排,且改性PVA-FRCC的抗弯强度高于未改性PVA-FRCC的;当纤维铺排层数为3层时,改性PVA-FRCC的抗弯强度最好。对PVA-FRCC的弯曲过程进行有限元模拟分析,含有横向铺排纤维的PVA-FRCC断裂失效时,纤维的桥连作用突显。同时,交叉铺排的PVA-FRCC中除横向铺排的纤维承力外,纵向纤维也有一定的承力,且试样失效后无界面损伤。

关键词: PVA纤维, 二氧化硅, 接枝改性, 水泥基复合材料, 抗弯强度

Abstract:

In order to improve the interface bonding strength between polyvinyl alcohol (PVA)fiber and cement, silica nanoparticles (SiO2 NPs) were grafted on the surface of PVA fiber to prepare modified PVA fiber reinforced cementitious composites (PVA-FRCC). The bending strength of PVA-FRCC was evaluated by three-point bending test, and the influences of fiber arrangement direction and layer number on the bending strength were studied. The results show that the bending strength of PVA-FRCC with cross arrangement is better than that of longitudinal or transverse arrangement. The bending strength of composite reinforced by modified PVA fiber is higher than that with unmodified fiber. The bending strength of modified PVA-FRCC is the best when the number of fiber layers is 3. In the finite element analysis of bending process, when the failure occurs, the transverse fibers in PVA-FRCC present an obvious bridging function. Meanwhile, the longitudinal fibers in the cross-arranged PVA-FRCC could bear a low load while the transverse arranged fibers bear the main load and show no interface damage after failure.

Key words: PVA fiber, silicon dioxide, graft modification, cementitious composite, bending strength

中图分类号: 

  • TU528.58

图1

样品制备示意图"

图2

PVA-FRCC有限元模型"

图3

改性前后PVA纤维的SEM照片"

表1

改性前后PVA纤维表面元素含量"

处理方法 C O Si
未改性 69.53 29.62 0.00
改性后 68.12 29.94 0.99

图4

不同养护时间下PVA-FRCC抗弯强度与纤维横向铺排层数的关系"

图5

不同养护时间下PVA-FRCC抗弯强度与纤维纵向铺排层数的关系"

图6

不同养护时间下PVA-FRCC抗弯强度与纤维交叉铺排层数的关系"

图7

改性前后不同铺排方式的PVA-FRCC的抗弯强度"

图8

抗弯测试后试样的失效形态"

图9

横向铺排PVA-FRCC有限元分析图 单位:MPa。"

图10

交叉铺排PVA-FRCC有限元分析图 单位:MPa。"

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