Theoretical Model for the Stress–Strain Curve of CNT-Reinforced Concrete under Uniaxial Compression

Author:

Zhu Peng12ORCID,Jia Qihao1,Li Zhuoxuan1,Wu Yuching1ORCID,Ma Zhongguo John3

Affiliation:

1. College of Civil Engineering, Tongji University, Shanghai 200092, China

2. Key Laboratory of Performance Evolution and Control for Engineering Structures, Tongji University, Ministry of Education, Shanghai 200092, China

3. Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996, USA

Abstract

The incorporation of carbon nanotubes (CNTs) can enhance the mechanical properties of concrete. The stress–strain curves of CNT-reinforced concrete under uniaxial compression are investigated through an experimental program with different CNT and steel fiber proportions considered. The test results demonstrate that CNTs can increase both peak stress and peak strain, and steel fibers can further enhance the effect of CNTs. Additionally, steel fibers can effectively enhance both the strength and ductility. Theoretical models for the peak strain, initial elastic modulus, toughness index and relative absorbed energy are established. A theoretical model for the uniaxial compressive constitutive relationship of CNT-reinforced concrete considering CNT and steel fiber content is developed. Finite element (FE) modelling is developed to simulate the axial compression behavior of CNT-reinforced concrete.

Funder

National Key R&D Program of China

National Science Foundation of China

Publisher

MDPI AG

Subject

Building and Construction,Civil and Structural Engineering,Architecture

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