Verbundverhalten mineralisch gebundener und polymergebundener Bewehrungsstrukturen aus Carbonfasern bei Temperaturen bis 500 °C

Abstract

Bond behavior of mineral-impregnated and polymer-impregnated reinforcement structures made of carbon fibers at temperatures up to 500 °C. For a wide application of carbon reinforced concrete in the construction sector, the bond between concrete matrix and the reinforcing elements must be guaranteed also at high temperatures and in the case of fire. Inorganic impregnated fibre reinforcements offer a promising alternative to the common, commercially available polymer impregnated structures, whose bonding performance deteriorates dramatically with increasing temperature. The main challenges in the production of mineral bonded carbon fibre reinforcements are the development of a suitable processing technology and the choice of appropriate raw materials. The paper at hand deals with these challenges and focuses on the mechanical performance of thin reinforcement rebar made of mineral impregnated carbon fibre yarns. Pull-out tests show that this new reinforcement possesses a significantly better bonding behaviour towards concrete at elevated temperature in comparison to the polymer-impregnated reference materials. The bond remains sufficient even at a temperature of 500 °C.