Uniaxial Tensile and Compressive Stress-Strain Behavior of Multi-scale Fiber-reinforced Ultra-high Performance Concrete

被引：0
|
作者：
Zhang W. [1 ]
Zhang Z. [1 ]
Liu P. [1 ]
Zhang Y. [2 ,3 ]
Zhang C. [4 ]
She W. [2 ]
机构：
[1] Department of Civil Engineering, Nanjing Forestry University, Nanjing
[2] Department of Materials Science and Engineering, Southeast University, Nanjing
[3] College of Civil Engineering, Lanzhou University of Technology, Lanzhou
[4] National Defense Engineering Institute, Academy of Military Science of PLA, Luoyang, 471023, Henan
来源：
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2020年 / 48卷 / 08期
关键词：
Calcium carbonate whisker; Carbon nanotubes; Fiber; Multi-scale; Ultra-high performance concrete;
D O I：
10.14062/j.issn.0454-5648.20200179
中图分类号：
学科分类号：
摘要：
A nano-, micron-, and millimeter-sized multi-scale fiber composite reinforced ultra-high performance concrete (UHPC) was proposed. The mechanical properties of UHPC can be improved by suppressing the defects of different sizes with different fibers. Carbon nanotubes, micron-sized calcium carbonate whiskers, and millimeter-sized steel fibers were used to design 7 groups of UHPC specimens. The axial tensile and compressive stress-strain curves of UHPC were measured. The results show that the initial crack strength and strain of UHPC are determined by the millimeter-sized steel fiber in a macro-scale. However, micron- and nano-sized fibers have little effect on the initial crack strength and strain. The addition of calcium carbonate whiskers and carbon nanotubes changes the tensile behavior of UHPC specimens after cracking, thus enhancing the strain hardening capability. The tensile and compressive properties of UHPC with different sizes of fibers are similar. The addition of calcium carbonate whisker has a positive effect rather than that of carbon nanotube when mixing with steel fiber. The effect becomes optimum when adding calcium carbonate whiskers and carbon nanotubes. © 2020, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.
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页码：1155 / 1167
页数：12
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