Study on Uniaxial Tensile Test Method and Constitutive Relationship of UHPC

被引：0
|
作者：
Yang J. [1 ,2 ]
Li Y. [1 ,2 ]
Chen B. [3 ,4 ]
Xu G. [1 ,2 ]
Huang Q. [4 ]
机构：
[1] Hubei Key Laboratory of Disaster Prevention and Mitigation, Hubei, Yichang
[2] College of Civil Engineering & Architecture, China Three Gorges University, Hubei, Yichang
[3] College of Civil Engineering, Fujian University of Technology, Fuzhou
[4] College of Civil Engineering, Fuzhou University, Fuzhou
来源：
Cailiao Daobao/Materials Reports | 2024年 / 38卷 / 06期
基金：
中国国家自然科学基金;
关键词：
connection device; reinforcement methods; steel fiber factor; ultra-high performance concrete; uniaxial tensile constitutive relationship; uniaxial tensile test;
D O I：
10.11896/cldb.22110263
中图分类号：
学科分类号：
摘要：
Uniaxial tensile test of ultra-high performance concrete(UHPC)is a basic material test to analyze its tensile properties and tensile constitutive relationship. Through optimization of the shape and size of the specimens,the success rate of the test has been greatly improved. However,due to the difference in the connection device and reinforcement method,the success rate of each institution is uneven. In order to further ensure the success rate of the uniaxial tensile test,the influence of four common connection devices and three reinforcement methods on the success rate of the test were systematically analyzed through experimental research and numerical simulation,and the optimal test scheme was selected. The results showed that the in-plane clamping device has the advantages of reliable connection and simple operation,which is suitable for popularization. However,there is a problem that the size processing error or micro deformation of the clamp leads to the narrowing of the contact surface with the specimen,intensifies the stress concentration caused by clamping,and makes it impossible to control the main crack to be located in the measuring range;both flexible reinforcement (paste carbon fiber reinforced polymer)and rigid reinforcement (paste aluminum sheet) of the contact area between the specimen and the fixture can effectively solve the above problems,increase the success rate. In addition,the influence of the aspect ratio and volume fraction of steel fibers on the damage constitutive relationship of UHPC under uniaxial tension was investigated by using the optimal uniaxial tensile test method. The damage evolution law of UHPC under uniaxial tensile load was explored through acoustic emission (AE)monitoring. The damage factor was constructed using AE parameters (cumulative counts ratio),and the uniaxial tensile damage constitutive relationship of UHPC considering the influence of steel fiber was obtained. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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