Measuring and Modifying Interface Properties of PVA Fibers in ECC Matrix
Publication: Journal of Materials in Civil Engineering
Volume 13, Issue 6
Abstract
A single fiber pullout test was used in this study to measure the bond properties of polyvinyl alcohol fibers that are available at various diameters in a mortar matrix. Despite short fiber embedment lengths, the small diameter fibers ruptured during the pullout tests. However, it is shown that even if full fiber pullout is not achieved, it is still possible to determine a chemical debonding energy, Gd, and an initial interfacial frictional bond strength, τ0. Despite high Gd values, the fibers did not rupture during the fiber chemical debonding process, but during fiber pull-out, a strong slip-hardening effect, characterized by the high values of the slip-hardening coefficient, β, induced severe abrasion damage visible under scanning electron microscope on the fiber surface. As a consequence, when the fiber apparent tensile strength was exceeded, fibers ruptured by delamination. Finally, an attempt was made to lower the values of the bond properties to minimize fiber rupture during pullout. This goal was partially achieved by applying an oil coating on the hydrophilic polyvinyl alcohol fiber surface to reduce any strong fiber/mortar interaction.
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References
1.
Cooper, G. A., and Kelly, A. ( 1970). “The contribution to the work of fracture of a composite material of pull-out fibers.” Mechanics of composite materials, F. W. Wendt, H. Liebowitz, and N. Perrone, eds., Pergamon, Oxford, U.K., 653–661.
2.
Gao, Y. C. ( 1987). “Debonding along the interface of composites.” Mech. Res. Communications, 14(2), 67–72.
3.
Huseh, C. H. ( 1990). “Evaluation of interfacial shear strength, residual clamping stress and coefficient of friction for fiber-reinforced ceramic composites.” Acta Metall., 38(3), 403–409.
4.
Kanda, T., and Li, V. C. (1998). “Interface property and apparent strength of high-strength hydrophilic fiber in cement matrix.”J. Mat. in Civ. Engrg., ASCE, 10(1), 5–13.
5.
Katz, A., and Li, V. C. ( 1996). “A special technique for determining the bond strength of microfibers in cement matrix by pull-out test.” J. Mat. Sci. Letter, 15, 1821–1823.
6.
Leung, C. K. Y., and Li, V. C. ( 1990). “Strength-based and fracture based approaches in the analysis of fibre debonding.” J. Mat. Sci. Letter, 9, 1140–1142.
7.
Li, V. C., et al. ( 1996a). “Micromechanical models of mechanical response of HPFRCC,” A. E. Naaman, and H. W. Reinhardt, eds., RILEM Proc. 31, E&FN Spon, London, 43–100.
8.
Li, V. C., and Stang, H. ( 1997). “Interface property characterization and strengthening mechanisms in fiber reinforced cement based composites.” J. Advanced Cement Based Mat., 6(1), 1–20.
9.
Li, V. C., and Wu, H. C. ( 1992). “Conditions for pseudo strain hardening in fiber reinforced brittle matrix composites.” Appl. Mech. Rev., 45, 390–398.
10.
Li, V. C., Kanda, T., and Lin, Z. ( 1997). “The influence of fiber/matrix interface properties on complementary energy and composite damage tolerance.” Proc., 3rd Conf. on Fracture and Strength of Solids, 145–149, Hong Kong, 456–472.
11.
Li, V. C., Mishra, D. K., and Wu, H. C. ( 1995). “Matrix design for pseudo-strain-hardening fiber reinforced cementitious composites.” J. Mat. and Struct., 79(183), 586–595.
12.
Li, V. C., Wu, H. C., and Chan, Y. W. ( 1996b). “Effect of plasma treatment of polyethylene fibers on interface and cementitious composite properties.” J. Am. Ceramic Soc., 79(3), 700–704.
13.
Lin, Z., and Li, V. C. ( 1997). “Crack bridging in fiber reinforced cementitious composites with slip-hardening interfaces.” J. Mech. Phys. Solids, 45(5), 763–787.
14.
Lin, Z., Kanda, T., and Li, V. C. ( 1999). “On interface property characterization and performance of fiber-reinforced cementitious composites.” J. Concrete Sci. and Engrg., 173–184.
15.
Marshall, D. B., and Cox, B. N. ( 1988). “A J-integral method for calculating steady state matrix cracking stresses in composites.” Mech. of Mat., 7, 127–133.
16.
Naaman, A. E., and Reinhardt, H. W., eds. ( 1996). “High performance fiber reinforced cementitious composites.” RILEM Proc. 31, E&FN Spon, London.
17.
Stang, H., Li, Z., and Shah, S. P. (1990). “Pullout problem: Stress versus fracture mechanical approach.”J. Engrg. Mech., ASCE, 116(10), 2136–2150.
18.
Wu, H. C., and Li, V. C. ( 1997). “Basic interfacial characteristics of polyethylene fiber/cement composites and its modification by plasma.” Proc., 5th Int. Symp. on Brittle Matrix Compos. (BMC-5), Warsaw, Poland, 14–23.
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Received: Oct 18, 1999
Published online: Dec 1, 2001
Published in print: Dec 2001
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