Abstract
Fiber reinforced polymer (FRP) rebars have increasing popularity in the construction industry all around the world although steel rebars are widely used for reinforcing of the concrete so far. FRP bars, which have higher tensile strength compared to steel rebars with the same nominal diameter under normal conditions, are composed of resin matrix and fibers. In this paper, the load-bearing capacity of FRP reinforced concrete after elevated temperature exposition are present. The results are compared with concrete sample with steel reinforcement. Commercially produced glass FRP (GFRP) and carbon FRP (CFRP) rebars with sand coatings surface treatments were implemented in concrete beam and subjected to four-point bending load. The residual flexural strength of reinforced concrete after heating to 1000°C was obtained and evaluated and compared to results of non-heated elements. The results indicate that fire resistance of FRP reinforced beams can reach at least 60 minutes according the standard ČSN EN 13501-2.
Highlights
The present building industry is increasingly influenced by the requirements for low energy performance and long-life of buildings
Produced glass Fiber reinforced polymer (FRP) (GFRP) and carbon FRP (CFRP) rebars with sand coatings surface treatments were implemented in concrete beam and subjected to four-point bending load
The experiment was performed on concrete elements of size 100 × 150 × 1800 mm reinforced by GFRP, CFRP or steel rebars
Summary
The present building industry is increasingly influenced by the requirements for low energy performance and long-life of buildings. The load-bearing capacity of FRP reinforced concrete after elevated temperature exposition are present. The results indicate that fire resistance of FRP reinforced beams can reach at least 60 minutes according the standard ČSN EN 13501-2. A behavior of FRP rebars and concrete bond at elevated temperature are very well presented in paper [1].
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