混杂纤维高强混凝土层裂试验研究

发布时间：2018-09-14 07:47

【摘要】：采用Φ74 mm直锥变截面霍普金森压杆,对尺寸为Φ70 mm×600 mm,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1~30 s-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]:Using 桅 74 mm straight conical variable cross section Hopkinson compression bar, the spallation test of C80 grade hybrid fiber high strength concrete (HFRHSC) with the size of 桅 70 mm 脳 600 mm, mixed steel fiber and polypropylene fiber was carried out at a strain rate of 1 ~ 30 s ~ (-1). By adding waveform shaper and universal head, the ideal voltage history waveform suitable for spallation test is obtained. It is found that the addition of steel fiber and polypropylene fiber can obviously increase the spallation strength of concrete and the spallation strength of HFRHSC increases with the increase of strain rate. The reinforcing effect of steel fiber on spallation strength is greater than that of polypropylene fiber, the distance between the spallation section of concrete and the free end of the specimen decreases with the increase of strain rate, and the spallation frequency increases with the increase of strain rate. The spallation failure surface of plain concrete specimen is smooth, while that of HFRHSC specimen is uneven.
【作者单位】：广州大学土木工程学院;广东石油化工学院建筑工程学院;
【基金】：国家自然科学基金(51278135;51478128;51778158) 住房和城乡建设部科研开发项目(2010-K3-27) 广东省水利科技创新重点项目(2017-32) 广州大学重点科技项目培育项目(2015) 广东石油化工学院自然科学研究项目(2017QN33)
【分类号】：TU528

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