Steel fibre reinforced self-compacting concrete (SFRSCC) can combine the benefits of self-consolidating concrete technology with those derived from adding steel fibres to quasi-brittle cement based materials. In a recent applied research project joining pre-casting industry, private and public research institutions, a method was developed to design cost-competitive SFRSCC of rheological and mechanical properties required for the prefabrication of SFRSCC façade panels. To assure safe demoulding process of the panels, the influence of the concrete age on the compression behaviour of the SFRSCC should be known. For this purpose, series of tests with specimens of 12 h to 28 days were tested in order to analyze the age influence on the compressive strength, strain at peak stress, Young’s modulus, and compressive volumetric fracture energy. The experimental program was divided in two groups of test series, one with SFRSCC of a volumetric fibre percentage of 0.38% and the other with 0.57%. To apply the obtained data in the design and numerical analysis framework, the influence of the age on these SFRSCC properties was modelled. This work describes the carried out experimental program, presents and analyzes the obtained results, and provides the derived analytical expressions.

Le béton auto-plaçant avec fibres métalliques (SFRSCC) peut combiner les avantages de la technologie de l’auto-consolidation du béton avec ceux qui résultent de l’addition de fibres métalliques aux matériaux fragiles. Dans un récent projet de recherche impliquant l’industrie de préfabrication et des institutions de recherches publiques et privées, on a développé une méthode pour obtenir du SFRSCC de coût compétitif, avec des caractéristiques rhéologiques et mécaniques requises pour la préfabrication de panneaux de façade en SFRSCC.