| Summary: | FRPRCS11, GUIMARAES, Portugal, 26-/06/2013 - 28/06/2013 Braided aramid fiber bars (BAFB) are being used for the reinforcement of concrete structures for more than ten years. Their main advantages over conventional steel rebar rely in their lightness, durability performances, mechanical properties, and electromagnetic neutrality. A potential application is the construction of no-maintenance reinforced concrete structures for low temperature or cryogenic environments (Arctic regions or Liquefied Natural Gas facilities for instance), but the durability of BAFB reinforced concrete is still to be established in such extreme conditions. In this context, this study aims to investigate the low temperature behavior (-50°C) of the BAFB reinforced concrete. A first series of pull-out experiments conducted at ambient temperature made it possible to assess the bond stress-slip responses of various BAFB reinforced specimens and the influence of several key parameters (diameter and surface treatment of the bars). Some experiments and modelling were then carried out considering low temperature in order to evaluate the effect of differential thermal contraction of the constitutive materials on the bond properties.
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