| 摘要: |
| 考虑钢聚丙烯混杂纤维体积分数、波纹型钢纤维埋置深度和混凝土基体强度等因素,设计制作了21组混杂纤维混凝土拉拔试件,通过拉拔试验研究了波纹型钢纤维与混杂纤维混凝土基体的界面黏结性能.基于实测的钢纤维拉拔力滑移曲线,分析了上述因素对波纹型钢纤维最大黏结力和拉拔功的影响规律,阐明了界面黏结机理.结果表明：当波纹型钢纤维体积分数为150%、聚丙烯纤维体积分数为005%时,界面黏结性能最佳;界面黏结力随着基体强度的提高而提高；增大钢纤维的埋置深度,界面黏结强度提高,但当埋置深度大于8mm时,界面黏结强度随着埋置深度的增加而减小. |
| 关键词: 混杂纤维混凝土 纤维拔出行为 界面黏结性能 波纹型钢纤维 |
| DOI：103969/j.issn.1007 9629202004019 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51478367,51608397） |
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| Interfacial Bonding Performance between Corrugated Steel Fiber and Hybrid Fiber Concrete Matrix |
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WANG Li, XU Lihua, DENG Fangqian, LIU Sumei, CHI Yin
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School of Civil Engineering, Wuhan University, Wuhan 430072, China
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| Abstract: |
| 21groups of steel polypropylene hybrid fiber concrete pull out specimens were designed to study the influences of hybrid fiber content, embedded depth and matrix strength on the interfacial bonding performance between corrugated steel fiber and hybrid fiber concrete matrix through one sided steel fiber pull out tests. The peak pull out force and pull out work were measured to analyze the influences of the aforementioned factors on the interfacial bonding performance between the corrugated fiber and the matrix. Moreover, the bonding mechanism of the fiber matrix interface was also revealed. Results show that the fiber pull out force reached maximum when the steel fiber content and polypropylene fiber content were kept to 150% and 005%, respectively. The interfacial bonding behavior can also be improved with the increase of concrete matrix strength. Increasing the fiber embedded depth is favorable to the increase of the pull out force. However, above the embedded depth greater than 8mm, the interfacial bonding strength gradually decreased with the increase of the embedded depth. |
| Key words: hybrid fiber concrete fiber pull out behavior interfacial bonding performance corrugated steel fiber |
