Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (10): 53-60.doi: 10.13475/j.fzxb.20201104208

• Fiber Materials • Previous Articles     Next Articles

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 Online:2021-10-15 Published:2021-10-29
  • Contact: ZHANG Wei E-mail:zhangwei@ntu.edu.cn

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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

CLC Number: 

  • TU528.58

Fig.1

Schematic diagram of bending sample preparation. (a) Mold for bending samples; (b) Fiber arrangement"

Fig.2

Finite element model of PVA-FRCC. (a) Geometric model; (b) Finite element model"

Fig.3

SEM images of PVA fiber before(a)and after(b)modification"

Tab.1

Surface element content of modified and unmodifiedPVA fiber%"

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

Fig.4

Relationship between bending strength and number of fiber transverse laying layers of PVA-FRCC under different curing time"

Fig.5

Relationship between bending strength and number of longitudinal laying fiber layers of PVA-FRCC under different curing time"

Fig.6

Relationship between bending strength and number of fiber cross laying layers of PVA-FRCC under different curing time"

Fig.7

Bending strength of modified and unmodified PVA-FRCC with different arrangement. (a) Transverse; (b) Longitudinal; (c) Cross"

Fig.8

Failure morphologies after bending tests"

Fig.9

Finite element analysis of PVA-FRCC with transverse arrangement.(a) Stress distribution before failure;(b) Interface damage distribution after failure"

Fig.10

Finite element analysis of PVA-FRCC with cross arrangement. (a) Stress distribution before failure; (b) Interface damage distribution after failure"

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