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Apr 2020 : Coupler performance tests at elevated temperatures
The Imperial College London tested Dextra Bartec/Fortec and Griptec couplers at elevated temperatures to evaluate how the couplers would perform in case of a fire.
Highlights of the test include:
Please read full article below:
Dextra have recently collaborated with Imperial College London to investigate the performance of rebar couplers at elevated temperatures, simulating temperatures which could occur in rebar due to fire, both before and after concrete spalling.
Standard 16mm and 20mm Bartec/Fortec and Griptec couplers were used, as well as non-spliced reinforcement and tests conducted at ambient, elevated steady state and transient elevated temperatures.
Codified procedures for the fire design of reinforced concrete structures typically give prescriptive recommendations for rebar/coupler cover with the aim of protecting the reinforcement from reaching temperatures above a critical value of around 500°C.
The test results show that:
The findings also indicate that current codified rules can be used for assessing the strength and stiffness properties of both non-spliced rebar and rebar connected with Bartec/Fortec or Griptec couplers.
However, the code assumptions regarding the ultimate strain characteristics at elevated temperatures were found to be unrealistic for hot rolled rebar, as well as rebar connected by couplers.
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References
Bompa, D. V., & Elghazouli, A. Y. (2019). Elevated temperature characteristics of steel reinforcement incorporating threaded mechanical couplers. Fire Safety Journal, 104, 8–21. https://doi.org/10.1016/j.firesaf.2018.12.006
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Operating since 1983, Dextra Group is a manufacturing, freight forwarding and trading company specialized in supplying the construction and industrial sectors. We have activities in more than 55 countries through our network of affliates and partners.
The world leading manufacturer of rebar mechanical splices, we also engineer and produce innovative architectural and geotechnical solutions in high performance steel and FRP composite materials.
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