首页|混掺钢纤维对掺偏高岭土UHPC抗弯性能影响研究

混掺钢纤维对掺偏高岭土UHPC抗弯性能影响研究

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本试验通过四点弯曲试验,研究混掺不同类型钢纤维对掺偏高岭土超高性能混凝土(UHPC)抗弯性能的影响.结果表明,钢纤维长度增加会导致UHPC坍落扩展度降低、工作性能变差,混掺钢纤维的长度不宜超过20 mm;初始变形与弹性变形拐点所对应的应力均在7.5 MPa左右,初始变形阶段以基体受力为主,弹性变形阶段后,是基体与钢纤维共同受力;UHPC抗弯强度和峰值扰度均随钢纤维长度增加逐渐增大,而弯曲韧性性能随钢纤维长度增加呈先减小后增大趋势,当纤维长径比为100时,YD组的抗弯性能约为BD组的1.25倍;掺入偏高岭土能够改善混凝土的微观结构,并能为钢纤维提供更多的水化附着物,宏观上则表现为抗弯性能显著提升.
Experimental Study on the Effect of Mixing Steel Fibers on the Flexural Properties of UHPC with Metakaolin
The effect of mixing different types of steel fibers on the flexural performance of ultra-high performance concrete(UHPC)with metakaolin was studied by four point bending tests.The results show that an increase in the length of steel fibers will lead to a decrease in the slump extension and deterioration of the working performance of UHPC,and the length of mixed steel fibers should not exceed 20 mm;The stress corresponding to the inflection point of initial deformation and elastic deformation is around 7.5 MPa.In the initial deformation stage,the stress is mainly on the matrix,and after the elastic deformation stage,the stress is jointly on the matrix and steel fibers;The bending strength and peak deflection of UHPC gradually increase with the increase of steel fiber length,while the bending toughness energy first decreases and then increases with the increase of steel fiber length.When the fiber length to diameter ratio is 100,the bending performance of YD group is about 1.25 times that of BD group;The addition of metakaolin can improve the microstructure of concrete and provide more hydration attachments for steel fibers.On the macro level,it shows a significant improvement in flexural performance.

ultra high performance concretesteel fiber mixingmetakaolin soilbending resistancemicrostructure

冯国益、周志威、邱祥健、王杰、肖东、余中华

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成都城投城建科技有限公司,四川 成都 610500

超高性能混凝土 钢纤维混掺 偏高岭土 抗弯性能 微观结构

成都城建投资管理集团有限责任公司"科技城投"项目

2023CDCI114

2024

非金属矿
苏州非金属矿工业设计研究院

非金属矿

CSTPCD
影响因子:0.636
ISSN:1000-8098
年,卷(期):2024.47(1)
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