| 混杂纤维增强高强混凝土性能研究 |
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| 引用本文： | 赵雅明,张明飞,张振,罗要飞.混杂纤维增强高强混凝土性能研究[J].硅酸盐通报,2022,41(7):2299-2307. |
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| 作者姓名： | 赵雅明 张明飞 张振 罗要飞 |
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| 作者单位： | 1.中铁建设集团有限公司,北京 100040; 2.郑州航空工业管理学院土木建筑学院,郑州 450046; 3.长安大学公路学院,西安 710064 |
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| 基金项目： | 国家自然科学基金(41902266);中铁建设集团有限公司2022年度科技研发计划(22-76D) |
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| 摘 要： | 为研究钢纤维、聚乙烯醇纤维混杂比例对高强混凝土性能的影响,通过合理设计坍落度试验、力学强度试验、收缩试验、抗裂试验、抗氯离子侵蚀试验,对比评价了纤维混杂比例对高强混凝土工作性、抗折强度、收缩性、抗裂性能以及氯离子渗透系数的影响。结果表明,钢纤维和聚乙烯醇纤维降低了新拌混合物的工作性。与单掺纤维相比,混杂纤维对高强混凝土力学性能改善效果不明显,但可明显改善混凝土抗裂性能,开裂面积抑制率最大为95.8%,同时能使高强混凝土收缩率和氯离子分别降低27.7%和66.5%,明显提高高强混凝土的耐久性能。通过扫描电镜试验分析探讨了纤维增强混凝土的作用机理,结果表明混杂纤维对基体内部结构的改善实现了对混凝土宏观性能的提升,最终推荐采用0.75%(体积分数)钢纤维和0.25%(体积分数)聚乙烯醇纤维。
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| 关 键 词： | 混杂纤维 高强混凝土 力学性能 收缩性 抗裂性 抗氯离子侵蚀性 |
| 收稿时间： | 2022-03-05 |
Performance of Hybrid Fiber Reinforced High-Strength Concrete |
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| ZHAO Yaming,ZHANG Mingfei,ZHANG Zhen,LUO Yaofei.Performance of Hybrid Fiber Reinforced High-Strength Concrete[J].Bulletin of the Chinese Ceramic Society,2022,41(7):2299-2307. |
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| Authors: | ZHAO Yaming ZHANG Mingfei ZHANG Zhen LUO Yaofei |
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| Affiliation: | 1. China Railway Construction Group Co., Ltd., Beijing 100040, China; 2. School of Civil Engineering and Architecture,Zhengzhou University of Aeronautics, Zhengzhou 450046, China; 3. School of Highway, Chang'an University, Xi'an 710064, China |
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| Abstract: | In order to clarify the effects mode of hybrid ratio of steel fiber and polyvinyl alcohol fiber on the performance of high-strength concrete, the effects on workability, flexural strength, shrinkage, cracking resistance, resistance to chloride ion erosion were comparatively evaluated by slump test, mechanical strength test, shrinkage test, crack resistance test and chloride ion erosion resistance test. The following conclusions are drawn from the study. Steel fibers and polyvinyl alcohol fibers have a detrimental effect on the workability of fresh mixes. The addition of mixed fibers does not have a greater improvement effect on the mechanical properties of high-strength concrete than the addition of a single fiber, but it significantly improves the cracking resistance of concrete, with a maximum cracking area inhibition of 95.8%. Meanwhile, the addition of hybrid fibers reduces the shrinkage and permeability of high-strength concrete by 27.7% and 66.5%, respectively, indicating that the durability performance of high-strength concrete can be significantly improved. The mechanism of effects of fiber-reinforced concrete was explored by scanning electron microscope test, which shows that the improvement of the internal structure of the matrix by blended fibers realizes the improvement of macroscopic properties of concrete. Finally, 0.75% (volume fraction) steel fiber and 0.25% (volume fraction) polyvinyl alcohol fiber are recommended as the optimum admixture. |
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| Keywords: | hybrid fiber high-strength concrete mechanical property shrinkage crack resistance resistance to chloride ion erosion |
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