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Durability of an Ultra High Performance Fiber Reinforced Concrete (UHPFRC) under progressive aging

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2013
auteur(s) Wang Wei; Liu Jian; Agostini Franck; Davy Catherine A.; Skoczylas Frédéric; Corvez Dominique
journal (abréviation) Cement and Concrete Research (Cem Concr Res)
volume (numéro) 55
  
pages 1 – 13
  Sous presse
résumé We assess the durability of a Ultra High Performance Fiber Reinforced Concrete (UHPFRC) after accelerated ageing, i.e. after partial drying, or 105°C oven-drying (dry reference state), 200, 300 or 400°C heat-treatment, or progressive splitting (Brazilian test). Our key experimental tool is gas permeability Kgas under varying confinement Pc, coupled to MIP and SEM analysis. UHPFRC properties are compared to standard mortar and ordinary concrete. Whereas usual UHPFRCs involve pozzolanic additions and thermal curing, this UHPFRC does not, and is significantly more porous (by 9-10%). However, 74% of its porosity comprises pores smaller than 4nm, i.e. located within the C-S-H. Dry reference state UHPFRC lies in the range of very high durable materials, with an average Kgas=10-18m2. Damage by heat-treatment at 400°C induces limited de-bonding at the fiber/paste interface, which increases Kgas up to 10-17m2 at Pc=6MPa. While sustaining more than 300 μm/m tensile strain, Kgas of UHPFRC remains virtually identical.
mots clés Ultra High Performance Fiber Reinforced Concrete, Gas permeability, Durability, Heat Treatment, Splitting test
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