Spalling tests for hybrid fiber high strength RC

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (24) : 91-96.

JIAO Chu-jie1, QUAN Chang-qing2, LI Xi-bo1, SHEN Bo1, YAN Yi1

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Abstract

A Φ74 mm straight cone variable cross-section Hopkinson pressure bar was used to do spalling tests on specimens of C80 hybrid fiber high strength reinforced concrete (HFHSRC) with different volume ratio of steel fiber and polypropylene fiber. The size of specimens was Φ70mm×600mm, and the test strain rate was between 1s-1 and 30s-1. The ideal voltage time-history waveform was obtained through adding a waveform shaping device and a universal joint. It was found that mixing steel fiber and polypropylene one can significantly improve the anti-spalling strength of HFHSRC; HFHSRC’s anti-spalling strength increases with increase in strain rate; the enhancement effect of steel fiber on the anti-spalling strength of HFHSRC is larger than that of polypropylene one; the distance between spalling surface and the free end of a specimen has a decrease trend with increase in strain rate, the spalling number increases with increase in strain rate; the damage surface of plain concrete specimen due to spalling is relatively smooth , but that of HFHSRC specimen is irregular.

Key words

hybrid fiber / high strength reinforced concrete (RC) / spall fracture, strain rate

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JIAO Chu-jie1, QUAN Chang-qing2, LI Xi-bo1, SHEN Bo1, YAN Yi1. Spalling tests for hybrid fiber high strength RC[J]. Journal of Vibration and Shock, 2017, 36(24): 91-96

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