Strengthening of CFRC with Photo-Oxygenated Carbon Fiber

Kojima Akira, Yoshikawa Takao, Furukawa Shigeru, Tomizawa Yoshio, Otani Sugio

doi:10.7209/tanso.1994.71

Surface modification of PAN based carbon fiber (CF) by photo-oxygenation was investigated to give high adhesion between CF and cement matrix to CF/cement composites (CFRC). Photooxygenation was carried out by radiating ultraviolet rays (120w, 184.9nm, 253.7nm) onto CF paper under ozone stream (normal pressure). CF surface was remarkably modified to hydrophobic by photo-oxygenation treatment. CFRC plates (thickness: 6mm) were prepared by laminating 12 sheets of CF paper preimpregnated with portland cement paste (W/C=40%), and cured in water (14 days). These CFRC plates prepared from CF paper pretreated by photo-oxygenation treatment, exhibited higher flexural strength compared with those from CF paper without photo-oxygenation treatment.<BR>The mechanical properties of CFRC prepared from photo-oxygenated CF paper were influenced by the temperature and time of treatment. The most effective condition of photo-oxygenation treatment on CF paper was the one at 150°C for 28min. The flexural strength (72MPa) of CFRC plate prepared with this photo-oxygenation on CF paper, was the largest of all.

Strengthening of CFRC with Photo-Oxygenated Carbon Fiber

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