采用Φ74mm直锥变截面霍普金森压杆，对尺寸为Φ70mm×600mm，掺钢纤维和聚丙烯纤维的C80级混杂纤维高强混凝土（HFRHSC）试块，进行应变率为1s-1-30s-1的层裂试验。通过加置波形整形器和万向头，得到了适合层裂试验的理想电压时程波形，试验发现钢纤维和聚丙烯纤维的掺入可显著提高混凝土的层裂强度；HFRHSC层裂强度随应变率提高而提高；钢纤维对层裂强度的增强效应大于聚丙烯纤维的增强效应；混凝土层裂断面与试块自由端的距离基本呈现随应变率提高而减小的趋势，层裂次数随应变率的提高而增多，素混凝土试块的层裂破坏面较为平整，而HFRHSC试块的层裂面凹凸不平。
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.
关键词
混杂纤维 /
高强混凝土 /
层裂 /
应变率
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Key words
hybrid fiber /
high strength reinforced concrete (RC) /
spall fracture, strain rate
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参考文献
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