Abstract
In damaged structures, a knowledge of the value of the residual concrete strength is needed as a basis for the decision of reconstructing or repairing and for the design of the repair project. In this work, the limits of applicability of the Sonreb method, a combination of the ultrasonic pulse velocity and the Schmidt index measurement, in the detection of damage caused by high temperatures and chemical attack byammonium nitrate and ammonium sulphate is discussed. It is concluded that the Sonreb method can be used in assessing the fire-damaged concretes after making a classification of the degree of damage, the duration and the temperature of exposure to fire. In the case of chemical attack, a knowledge is required as to the duration of exposure and the prevailing process of corrosion.
Résumé
Dans le cas d'ouvrages endommagés par l'incendie, par les agents chimiques ou par des secousses sismiques il se pose souvent le problème d'évaluer la réserve de résistance mécanique du béton. La méthode Sonreb élaborée en grande partie pour le contrôle de qualité du béton au cours des travaux, et qui consiste à combiner les résultats des mesures des vitesses ultrasoniques et des mesures sclérométriques de Schmidt peut-ellé être appliquée à ces bétons endommagés? Cette étude s'efforce de répondre à cette question. Les limites d'application de la méthode Sonreb sont discutées pour les bétons soumis à de hautes températures et aux effets des engrais artificiels tels que le nitrate d'ammonium et le sulfate d'ammonium. L'application de la méthode paraît être possible à condition qu'une étude préalable nous renseigne sur la durée et la température maximale atteinte par l'incendie et nous permette de classifier les niveaux des dommages par secteur. Les valeurs contradictoires des vitesses du son et des indices sclérométriques en un même lieu donnent des indications précieuses et en déterminant la profondeur de béton détérioré on peut arriver à des résultats sûrs avec Sonreb. Dans le cas des bétons corrodés, il est nécessaire de savoir si la corrosion est due à la dissolution de la matière ou à l'expansion des sels formés et si ces deux processus sont simultanés ou consécutifs, et de connaître la durée de l'exposition.
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Akman, M.S., Güner, A. The applicability of sonreb method on damaged concrete. Mat. Constr. 17, 195–200 (1984). https://doi.org/10.1007/BF02475244
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DOI: https://doi.org/10.1007/BF02475244