| 摘要: |
| 研究了制备单向分布钢纤维混凝土的方法及单向分布钢纤维对混凝土劈裂抗拉强度和弯曲抗拉强度的增强作用.在钢纤维混凝土成型振动时，对试模中的混凝土拌合物施加匀强磁场，钢纤维受到磁场力作用，方向趋同于磁场方向，硬化后即制备出单向分布钢纤维混凝土.结果表明：制备的单向分布钢纤维混凝土纤维方向效应系数达到090以上；钢纤维混凝土的劈裂抗拉强度和弯曲抗拉强度随钢纤维方向效应系数的提高而提高；钢纤维掺量相同时，相同配合比的单向分布钢纤维混凝土的劈裂抗拉强度和弯曲抗拉强度显著高于普通钢纤维混凝土. |
| 关键词: 单向分布钢纤维混凝土 纤维方向效应系数 劈裂抗拉强度 弯曲抗拉强度 |
| DOI：103969/jissn1007 9629201503006 |
| 分类号: |
| 基金项目:河北省科技计划项目（12213803）；河北省教育厅重点基金资助项目（409703） |
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| Aligned Steel Fibre Reinforced Cement Based Composites（Ⅱ）：Preparation and Reinforcement of Aligned Steel Fibres |
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MU Ru1, LI Hui1, WANG Xiaowei1, ZHAO Quanming2, QIU Xin1
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1.School of Civil Engineering, Hebei University of Technology, Tianjin 300401, China;2.School of Information Engineering, Hebei University of Technology, Tianjin 300401, China
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| Abstract: |
| Preparation of aligned steel fibre reinforced concrete （ASFRC） and the reinforcement of aligned steel fibres on the splitting and flexural tensile strength of concrete were investigated. In the preparation of ASFRC, an external uniform magnetic field was applied to the freshly mixed steel fibre reinforced concrete when the concrete was vibrated to compact. Meanwhile, all steel fibres were subjected to the action of magnetic force. As the consequence, the steel fibres rotated and had the same or similar direction as that of the magnetic field applied. When hardened, the ASFRC was prepared. The results show that the average direction coefficient of steel fibres is 090 or greater, which means that most of the steel fibres have the same or similar direction as designed. The theoretical analysis results show that the tensile and flexural strength of SFRC increase with the average orientation coefficient of steel fibres. According to test results, for the concrete with the same steel fibre content, the splitting and flexural tensile strength of ASFRC is significantly greater than that of normal SFRC. |
| Key words: aligned steel fibre reinforced concrete（ASFRC） orientation coefficient of fibre splitting tensile strength flexural tensile strength |
