Bond Properties of Carbon Fibers in Cementitious Matrix
Publication: Journal of Materials in Civil Engineering
Volume 7, Issue 2
Abstract
The interfacial bond properties of two carbon fibers, having diameters of 10 μm and 46 μm, were tested for cement matrices of different water-to-binder ( w /b) ratios and silica-fume contents. The pullout test was conducted using a special technique that prevented the brittle fiber from breaking during specimen handling. An environmental scanning electron microscope (ESEM) was used to determine the nature of the fiber-matrix bond. The results show a friction-based bond mechanism for the fiber of 10 μm, with a bond strength of 0.5 MPa for the high w /b matrix and without silica fume. Densifying the matrix by lowering the w /b ratio or by using silica fume improved the bond by 50–100%. For the larger-diameter fiber, silica fume had a very strong effect on the bond (an increase of 370–670%). It appears that long grooves along the fiber surface creates a mechanical anchorage, which is strongly affected by the presence of silica fume.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 7 • Issue 2 • May 1995
Pages: 125 - 128
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: May 1, 1995
Published in print: May 1995
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