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KSCE Journal of Civil Engineering

, Volume 23, Issue 9, pp 4000–4009 | Cite as

Axial Compressive Performance of CFRP Confined Self-stressing High-strength Concrete Cylinders

  • Qi CaoEmail author
  • Xiaojun Li
  • Rongxiong Gao
Structural Engineering
  • 12 Downloads

Abstract

Due to the advantages of FRP (fiber reinforced polymer), such as light weight, high strength and corrosion resistance, FRP-confined concrete columns are gradually applied in civil engineering structures and have drawn wide attention from the engineering community. In order to avoid the stress hysteresis of CFRP (carbon fiber reinforced polymer) and make full use of FRP materials, expansive agent was added to concrete to make self-stressing high-strength concrete. In this study, the axial compression performance of 18 CFRP-confined self-stressing high-strength concrete cylinders was examined. The parameters include the CFRP layers and the level of prestress (with or without prestress). Experimental results show that 3.53–5.34 MPa prestress in concrete and 799.3–1584.2 MPa prestress in CFRP are produced in the composite cylinder. The stress-strain curves obtained from the experiment shows that the intercept stress, inflection stress and peak stress of the self-stressing specimens are all higher than those of the non-prestressed specimens. With the application of prestress, the utilization ratio of CFRP increases as well. In the theoretical calculation of intercept and peak stress, by modifying the existing models, the experimental results are in good agreement with the calculated results.

Keywords

CFRP high-strength concrete expansive agent prestress intercept stress peak stress 

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Notes

Acknowledgements

Authors would like to acknowledge the financial support provided by the National Natural Science Foundation of China (Grants No. 51208077, and 51678264), Natural Science Foundation of Liaoning Province (Project No. 20170540168), and Program for Liaoning Innovative Research Team in University (Project No. LT2017005).

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Copyright information

© Korean Society of Civil Engineers 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Coastal and Offshore EngineeringDalian University of TechnologyDalianChina
  2. 2.School of Civil Engineering and MechanicsHuazhong University of Science and TechnologyWuhanChina

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