首页|不同破坏荷载下镀铜钢纤维增强废弃陶瓷超高性能混凝土的压敏性

不同破坏荷载下镀铜钢纤维增强废弃陶瓷超高性能混凝土的压敏性

Piezoresistivity of copper-plated steel fibers reinforced ultra high performance concrete with ceramic waste powder under different failure load types

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镀铜钢纤维具有良好的导电性、耐腐蚀性和力学性能,而废弃陶瓷粉较水泥具有低电阻率、低碳性、火山灰活性和内养护作用.则镀铜钢纤维和废弃陶瓷粉的协同作用有望赋予混凝土良好且稳定的压敏性能和宽的应力/应变监测范围.因此,本文制备了低碳智能镀铜钢纤维增强废弃陶瓷超高性能混凝土,并研究了镀铜钢纤维掺量对废弃陶瓷超高性能混凝土流动性能、电学性能和不同荷载类型下的废弃陶瓷超高性能混凝土压敏性能的影响规律,并建立了力-电本构模型.研究结果表明:扩展度随镀铜钢纤维的掺入而降低,但均能达到自流平效果;镀铜钢纤维可显著降低废弃陶瓷超高性能混凝土的直流和交流电阻率;镀铜钢纤维大幅度提高废弃陶瓷超高性能混凝土在极限抗折和抗压荷载下的电阻率变化率和应力/应变灵敏度,且在抗折破坏荷载工况下的压敏性更好.通过力-电本构模型可知,其电阻率变化率和应力/应变曲线基本遵从三次多项式函数关系.因此,可通过测试镀铜钢纤维增强废弃陶瓷超高性能混凝土的电阻率实现混凝土结构的应力/应变监测.
The copper-plated steel fiber has excellent electrical conductivity,corrosion resistance and good mechanical properties.Compared with cement,the ceramic waste powder has low electrical resistivity,low carbon property,pozzolanic activity and internal curing.The synergy between copper-plated steel fiber and waste ceramic powder is expected to endow concrete with excellent and stable piezoresistivity and a wide stress/strain monitoring range.Therefore,low-carbon and smart copper-plated steel fiber reinforced ultra high performance concrete with ceramic waste was prepared.Then,the effects of copper-plated steel fibers content on the slump,electrical and piezoresistivity properties under different failure load types of the ultra high performance concrete with ceramic waste were analyzed,and the stress-electricity constitutive model was established.The results show that the spread of ultra high performance concrete with waste ceramic powder reduces with increasing copper-plated steel fiber content,but still has self-leveling compacting characteristics.The copper-plated steel fiber can significantly reduce the direct current and alternating current resistivity of the ultra high performance concrete with ceramic waste.The copper-plated steel fiber greatly improves the fractional change in resistivity and stress/strain sensitivity of the ultra high performance concrete with ceramic waste under ultimate flexural and compressive loads,and the piezoresistivity properties are better under the fracture failure condition.According to the stress-electricity con-stitutive model,both the fractional change in resistivity and stress/strain curves basically follow the cubic poly-nomial function relationship.Therefore,the copper-plated steel fiber reinforced ultra high performance concrete with ceramic waste can be used to monitor the stress/strain of concrete structures through testing resistivity.

ultra high performance concretecopper-plated steel fiberceramic waste powderflexural failurecompressive failurepiezoresistivity properties

张立卿、边明强、郭绵珍、潘延念、许开成、王云洋

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华东交通大学 轨道交通基础设施性能监测与保障国家重点实验室,南昌 330013

华东交通大学 土木建筑学院,南昌 330013

中恒建设集团有限公司,南昌 330200

湖南文理学院 土木建筑工程学院,常德 415000

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超高性能混凝土 镀铜钢纤维 废弃陶瓷 抗折破坏 抗压破坏 压敏性能

中国博士后科学基金江西省科技厅面上项目华东交通大学轨道交通基础设施性能监测与保障国家重点实验室资助项目

2022M71349720224BAB204067HJGZ2022201

2024

10.13801/j.cnki.fhclxb.20230921.001

复合材料学报
北京航空航天大学 中国复合材料学会

复合材料学报

CSTPCD北大核心
影响因子：0.933
ISSN：1000-3851
年,卷(期)：2024.41(4)
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