Abstract
The article presents the results of work by the AFREM/HPC group on the formulation of high-performance concretes. This is an updating of LCPC's grout method. The goal is a methodology making it possible, for a given binder (or mixture of binders), to determine the saturation doses of a certain number of superplasticizers and compare them in terms of their effectiveness and the duration of the rheological behaviour they impart. The innovations with respect to the old method are the following: i) the starting concrete can vary over a broader range, ii) part of the sand is added in the grout, iii) mixing and measurement are better codified, and iv) the method of determining the saturation proportion is objective. The method has successfully passed tests of repeatability and reproducibility (between the six member laboratories of the group).
Résumé
L'article présente le résultat du travail du groupe AFREM/BHP sur la formulation des bétons à hautes performances. Il s'agit d'une remise à jour de la méthode des coulis du LCPC. Le but en est de fournir une méthodologie permettant, pour un liant (ou mélange de liants) donné, de déterminer les doses de saturation d'un certain nombre de superplastifiants, de comparer leurs efficacités respectives et leur propension à conférer un comportement rhéologique stable dans le temps. Les nouveautés introduites, par rapport à l'ancienne méthode, sont les suivantes: i) béton initial pouvant varier dans une plus large gamme, ii) introduction d'une partie du sable dans le coulis, iii) malaxage et mesure mieux codifiés, iv) méthode objective de détermination de la dose de saturation. La méthode a fait l'objet d'essais de répétabilité et de reproductibilité (entre les six laboratoires membres du groupe) satisfaisants.
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de Larrard, F., Bosc, F., Catherine, C. et al. The AFREM method for the mix-design of high performance concrete. Mat. Struct. 30, 439–446 (1997). https://doi.org/10.1007/BF02498568
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DOI: https://doi.org/10.1007/BF02498568