Abstract
Several methods were proposed in the past to measure concrete bleeding, but none of them gives complete satisfaction. The method presented herein consists in sucking water with a pipette, in tracks made on the top surface of concrete just after casting. It takes water evaporation into account. Three tests are carried out simultaneously with three samples of different initial heights. Comparison of the results leads to know whether bleeding is localised (in channels) or not. The average bleeding rate of tests that exhibit no channel is the major result of the test; it is found to be rather repeatable. Overall, this method is believed to be more accurate than the previous ones, since any movement of the sample is avoided during test. Also, a double weighing of water is carried out.
Résumé
Plusieurs méthodes ont été proposées pour mesurer le ressuage d'un béton, cependant, aucune d'elles n'est complètement satisfaisante. La méthode que nous proposons dans cet article consiste à aspirer l'eau de ressuage avec une pipette dans des sillons préalablement tracés à la surface du béton après coulage. La méthode tient compte de l'évaporation par une double pesée. Trois essais sont menés simultanément dans trois moules de différente hauteur. La comparaison des résultats obtenus permet de savoir si une localisation du ressuage fut présente. La moyenne des vitesses de ressuage non localisées est le principal résultat de l'essai. Sa répétabilité est assez bonne et semble donner des résultats plus précis qu'avec les autres essais.
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Editorial note Dr. François de Larrard is a RILEM Senior Member. He works at LCPC, a RILEM Titular Member.
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Josserand, L., de Larrard, F. A method for concrete bleeding measurement. Mat. Struct. 37, 666–670 (2004). https://doi.org/10.1007/BF02480511
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DOI: https://doi.org/10.1007/BF02480511