Influence of Multi-scale Steel Fiber Combination and Carbon Nanotube on Mechanical Properties of Reactive Powder Concrete

被引：0
|
作者：
Niu X. [1 ,2 ]
Peng G. [2 ]
He J. [2 ]
Lei Z. [2 ]
机构：
[1] State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing
[2] School of Civil Engineering, Beijing Jiaotong University, Beijing
来源：
Peng, Gaifei (gfpeng@bjtu.edu.cn) | 1600年 / Tongji University卷 / 23期
关键词：
Carbon nanotube; Mechanical property; Multi-scale steel fiber combination; Reactive powder concrete(RPC);
D O I：
10.3969/j.issn.1007-9629.2020.01.032
中图分类号：
学科分类号：
摘要：
The influence of multi-scale steel fiber combination and carbon nanotube on mechanical properties of reactive powder concrete(RPC) was investigated. Moreover, pore structure of RPC before and after adding carbon nanotube was also determined by means of mercury intrusion porosimetry(MIP). The results show that compared with macro-fiber, adding multi-scale steel fiber can improve the mechanical properties of RPC significantly. At an identical total dosage of steel fiber, the mechanical properties of RPC incorporating macro-fiber and meso-fiber decrease gradually with the increase of proportion of meso-fiber. The compressive strength, tensile splitting strength, bending strength and fracture energy of RPC are optimized by simultaneously addition of 1.5% macro-fiber and 0.5% meso-fiber to increase by 6.1%, 33.3%, 22.7% and 30.4% relative to that with the addition of 2.0% macro-fiber, respectively. In addition, adding 0.10% carbon nanotube can efficiently increase the compressive strength, tensile splitting strength, bending strength and fracture energy of RPC incorporating three types of steel fiber(i.e. macro-fiber, meso-fiber and micro-fiber), exhibiting the increments of 8.4%, 2.6%, 4.4% and 6.1%, resrespectively. This is mainly related to the filling effect and capacity for bridging cracks of carbon nanotube, and the snubbing effect between multi-scale fibers. Meanwhile, dispersion effect of carbon nanotube can significantly affect the mechanical properties of RPC. If carbon nanotube is not dispersed uniformly, local stress concentration will occur, thus resulting in a decrease in the mechanical properties of concrete. © 2020, Editorial Department of Journal of Building Materials. All right reserved.
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页码：216 / 223
页数：7
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