Materials and Structures

, Volume 44, Issue 1, pp 245–251 | Cite as

Permeability of AR-glass fibers roving embedded in cementitious matrix

  • Mehdi Kamali Dolatabadi
  • Steffen Janetzko
  • Thomas Gries
  • Bong-Gu Kang
  • Andreas Sander
Original Article

Abstract

The Textile Reinforced Concrete (TRC) are developed and employed in some serious applications recently. Nevertheless, the utilization of High-Performance fibers to bear load at TRC is relatively low in comparison to dry textile due to incomplete penetration of cementitious matrix into bundle of fibers. The main attempt of this paper is addressing a simple model to evaluate the quantity of penetration of cementitious matrix into bundle of fiber by means of the geometry of the bundle of fibers and distribution of cement particle size. For this purpose, an ideal geometry for bundle of fiber is contemplated. Then on the basis of certain cement particle size distribution geometrical limitation for penetration of cement within bundle of fibers has been discussed. Accordingly, the influence of geometrical parameters of the fiber bundle namely, fibers diameters, packing density and titer of bundle on penetration is considered analytically. For experimental work an AR-glass tow is surrounded by knitting pillar stitch to reinforce the concrete. To change geometry of bundle of fibers, different knitting tension and stitch length are used during production of samples. Then, the prepared samples are embedded in fine grained concrete. The yarn pull-out test has been carried out to reveal the efficiency of fibers in concrete. Partial penetration of cement is demonstrated by model and verified by experimental work due to the geometric restriction of bundle of fibers.

Keywords

Textile reinforced concrete AR-Glass Penetration of cement 

List of symbols

Quantity (unit)

Comment

de (μm)

Effective diameter

Df (μm)

Diameter of fibers

dg (μm)

Distance between two neighbor fibers in ideal arrangement of fibers

Dy (μm)

Diameter of roving

Fp (%)

Frequency of particle size

l (μm)

Unit length of roving under consideration

t (μm)

Thickness of penetrated matrix

Vr (μm3)

Volume of blocked particles

Vt (μm3)

Volume of transmitted particles

η (%)

Efficiency of fiber in concrete

νp

Cumulative volume of passed particle

ψ

Packing density of fibers

Notes

Acknowledgments

This project is part of the Collaborative Research Center 532 “Textile reinforced concrete—Basics for the development of a new technology” and sponsored by the Deutsche Forschungsgemeinschaft (DFG). The support is gratefully acknowledged.

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Copyright information

© RILEM 2010

Authors and Affiliations

  • Mehdi Kamali Dolatabadi
    • 1
    • 4
  • Steffen Janetzko
    • 2
  • Thomas Gries
    • 2
  • Bong-Gu Kang
    • 3
  • Andreas Sander
    • 2
  1. 1.Engineering Department, Science and Research Branch of TehranIslamic Azad UniversityTehranIran
  2. 2.Institut für TextiltechnikRWTH Aachen UniversityAachenGermany
  3. 3.Institut für BauforschungRWTH Aachen UniversityAachenGermany
  4. 4.ITARWTH Aachen UniversityAachenGermany

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