混杂纤维增强高强混凝土性能研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (7): 2299-2307.

混杂纤维增强高强混凝土性能研究

赵雅明¹, 张明飞², 张振³, 罗要飞²

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

收稿日期:2022-03-05 修回日期:2022-04-26 出版日期:2022-07-15 发布日期:2022-08-01
通讯作者: 罗要飞,博士,讲师。E-mail:hpulyf@163.com
作者简介:赵雅明(1981—),男,高级工程师。主要从事交通基础设施施工与管理方面的研究。E-mail:ZhaoY198105@163.com
基金资助:
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)

Performance of Hybrid Fiber Reinforced High-Strength Concrete

ZHAO Yaming¹, ZHANG Mingfei², ZHANG Zhen³, LUO Yaofei²

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

Received:2022-03-05 Revised:2022-04-26 Online:2022-07-15 Published:2022-08-01

摘要/Abstract

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。

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

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.

Key words: hybrid fiber, high-strength concrete, mechanical property, shrinkage, crack resistance, resistance to chloride ion erosion

中图分类号:

TU528

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.

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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