Effect of carbon fiber dispersion on the mechanical properties of carbon fiber-reinforced cement-based composites

The preparation of carbon fiber-reinforced cement-based composites involved two-step dispersions of carbon fibers. Both steps affected greatly the mechanical properties of the composites. With the aid of ultrasonic wave, a new dispersant hydroxyethyl cellulose was used to help fiber dispersion in th...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2008-07, Vol.487 (1), p.52-57
Main Authors: Wang, Chuang, Li, Ke-Zhi, Li, He-Jun, Jiao, Geng-Sheng, Lu, Jinhua, Hou, Dang-She
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Carbon fibers
Cement concrete constituents
Cement-based
Cements
Dispersion
Elements distribution
Exact sciences and technology
Industrial statistics
Materials
Mechanical properties
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Summary:The preparation of carbon fiber-reinforced cement-based composites involved two-step dispersions of carbon fibers. Both steps affected greatly the mechanical properties of the composites. With the aid of ultrasonic wave, a new dispersant hydroxyethyl cellulose was used to help fiber dispersion in the first step. The fracture surface of the composites was observed by scanning electron microscopy. The distribution of major elements was analyzed by the energy dispersive spectroscopy and the composition was analyzed through X-ray diffraction. The flexural strength, tensile strength, modulus, and compression strength were measured. Results showed that the distribution of major elements varied with the variation of the fiber dispersion status. The compressive strength increased by 20%, the tensile strength was 2.4 times that of the material without carbon fibers, the modulus increased by 26.8%, whereas the flexure stress decreased by 12.9%.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2007.09.073