Comparative fire behavior of geopolymer and epoxy resin bonded fiber sheet strengthened RC beams

Hai Yan Zhang, Hao Ran Lv, Venkatesh Kodur, Shu Liang Qi

Research output: Research - peer-reviewArticle

Abstract

This study presents results from fire resistance experiments on one RC control beam and seven fiber sheet strengthened RC beams, using geopolymer and epoxy resin as adhesive agents. Thermal response and deflection evolution of these beams with fire exposure time were monitored. The effectiveness of carbon fiber reinforced geopolymer (CFRG) strengthening system and carbon fiber reinforced polymer (CFRP) strengthening system at high temperatures is compared. Post-fire test observations and measured response parameters clearly show that the CFRG strengthening system remains fully effective at high temperatures, and thus CFRG strengthened beams experience lower deflections for longer duration (about 2 h) of fire exposure than corresponding CFRP strengthened beam with similar load levels. However, CFRG strengthened beams do not exhibit higher fire resistance than CFRP strengthened beam as anticipated. To explain this unexpected trend in results, detailed analysis, as well as numerous material level exploratory tests were conducted. The different failure mechanisms and additional contribution from cable action so as to enhance fire behavior of CFRP and CFRG strengthened beams were analyzed. Further test results and analysis clearly show that the early falling-off of fire insulation and fracturing of longitudinal CFRG system is the main cause for lower fire resistance in CFRG strengthened beams. When a layer of primer is applied between geopolymers and the insulation, the early falling-off of fire insulation can be prevented, and thus the fire resistance of CFRG strengthened beams can be enhanced (above 3 h).

LanguageEnglish (US)
Pages222-234
Number of pages13
JournalEngineering Structures
Volume155
DOIs
StatePublished - Jan 15 2018

Profile

Geopolymers
Epoxy resins
Carbon fibers
Fires
Fibers
Fire resistance
Polymers
Insulation
Temperature
Adhesives
Cables
Experiments
Hot Temperature

Keywords

  • Concrete beams
  • Epoxy resin
  • Fiber sheet
  • Fire test
  • FRP strengthening
  • Geopolymer

ASJC Scopus subject areas

  • Civil and Structural Engineering

Cite this

Comparative fire behavior of geopolymer and epoxy resin bonded fiber sheet strengthened RC beams. / Zhang, Hai Yan; Lv, Hao Ran; Kodur, Venkatesh; Qi, Shu Liang.

In: Engineering Structures, Vol. 155, 15.01.2018, p. 222-234.

Research output: Research - peer-reviewArticle

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