| 摘要: |
| 通过常规三轴受压强度和变形特性试验，研究了围压以及PVA纤维掺量对高性能PVA纤维增强水泥基复合材料(HPFRCC)受压性能的影响.结果表明：随着围压的增加，HPFRCC的轴向极限抗压强度以及峰值应变均显著提高；PVA纤维掺量对HPFRCC抗压强度的影响较小，在低围压受力状态下使用PVA纤维增强HPFRCC要比在高围压受力状态下更能发挥纤维的增强阻裂作用，而且PVA纤维掺量对应力应变曲线下降段也有一定影响.根据试验数据建立了HPFRCC的轴向极限抗压强度、轴向峰值应变与围压之间的关系. |
| 关键词: 聚乙烯醇纤维 高性能纤维增强水泥基复合材料(HPFRCC) 围压 极限强度 变形特性 |
| DOI：10.3969/j.issn.1007 9629.2012.02.004 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51078305)；河南省教育厅自然科学研究资助项目(2010B560006)；河南省重点学科资助项目(504906) |
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| Strength and Deformation Properties of HPFRCC under Conventional Triaxial Compression |
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LI Yan1, LIANG Xing wen2, LIU Ze jun1
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1.School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China;2.School of Civil Engineering, Xian University of Architecture and Technology, Xian 710055, China
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| Abstract: |
| Based on experiments for strength and deformation under conventional triaxial compression, the influences of confining pressure and PVA fiber content by volume on compressive performance of high performance fiber reinforced cement composite(HPFRCC) were studied. Study results indicate that ultimate strength and peak strain were significantly improved as the confining pressure increased. Because confining pressure is the significant factor, the confining effect introduced by PVA fiber content by volume is minor. PVA fiber played main role for the strength under the lower confining pressure. The axial stress strain curves with different confining pressure and different PVA fiber content by volume are obtained. Lateral confining pressure constraints the lateral expansion of HPFRCC, so there is a big deformation capacity with its ultimate strength improved. At lower confining pressure, PVA fiber content by volume has some effect on the decreased section of stress strain curve. According to test results, the relation among confining pressure, ultimate strength and axial peak strain is established. |
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