Study on the Behaviors of CFRP Confining Concrete Specimens Exposed to Fire, Acid and Alkaline Environments

Abstract:

This paper studies the behaviors of carbon fiber reinforced plastics (CFRP) confining concretes exposed to fire, acid or alkaline environments. The concrete specimens wrapped with CFRP were exposed to different high temperatures or submerged to acid or alkaline solutions with different concentrations. All the specimens were then loaded under uni-axial compression test. The strength and ductility of concrete specimen were evaluated. The environmental influences on the confining effects of CFRP were also investigated. The results indicate that CFRP reinforcements can provide good confinements for concrete specimens, so both the strength and ductility of concrete specimens can be significantly increased. But CFRP confining concrete specimens exposed to fire environments over 300°C will lose some of the confinements and the strength and ductility are significantly decreased. When adhered by fireproof material, CFRP confining concrete specimens exposed to fire environments will not lose all the confinements and still retain most of their original strengths and strains. The fireproof material can really protect CFRP confining concretes from high temperatures. The fire resistance effect of fireproof material depends on its thicknesses and the fire environments. The results also show that CFRP confining concrete specimens when submerged into acid or alkaline environments will lose some of the confining effect of CFRP. The higher the concentration or the longer the soaking period of acid or alkaline environments, the more the CFRP material is damaged and thus CFRP confining concrete specimens lose some of their strenghs.

• Periodical: Applied Mechanics and Materials (Volume 147)
• Pages: 32-36
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.147.32
• Online since: December 2011
• Authors: Ching Chang Lin, Cheng Hou Liu, Cho Liang Tsai
• Keywords: Acid or Alkaline Environment, Carbon Fiber Reinforced Polymer/Plastic (CFRP), Confining Concrete, Ductility, Fireproof Material, High-Temperature, Strength

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