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On compressive strength variation in concrete

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Abstract

The interrelationship of the standard deviation, the coefficient of variation, and the compressive strength of concrete was studied on 32 building sites and 14 ready-mix plants, with more than 30,000 observations analysed. While the standard deviation was found to be practically strength-independent when overall values were considered, the coefficient of variation showed such independence in its daily values. It was further concluded that formal compliance with a set of nominal requirements does not necessarily secure the expected strength variation, in which respect the actual level of supervision is the dominant factor. The average overal standard deviation was of the order of 60 kg. per sq. cm. and the daily coefficient of variation—of the order of 10%, irrespective of nominal conditions of concrete production.

Résumé

Les relations entre l'écart-type, l'écarttype relatif et la résistance à la compression du béton varient selon qu'on considère les valeurs globales ou journalières. Dans ce dernier cas l'écart-type relatif est pratiquement indépendant de la résistance moyenne et devrait être par conséquent utilisé dans des conditions où le contrôle de qualité repose sur la production journalière. Par contre, si l'on considère les valeurs globales, c'est l'écart-type qui est pratiquement indépendant de la résistance et qui devrait être utilisé lorsqu'on pratique le contrôle de qualité en conséquence.

Se conformer strictement à une série de prescriptions nominales n'est pas une condition suffisante pour obtenir le degré de contrôle voulu et une variation prédéterminée de la résistance du béton. On peut donc en conclure que cette variation dépend beaucoup plus du niveau réel de surveillance des opérations que de la méthode de production ellemême, de l'appareillage utilisé, etc. On a constaté que l'écart-type global moyen était de l'ordre de 60 kg/cm2 et que l'écart-type relatif journalier était de l'ordre de 10% quelles que fussent les conditions formelles de la production de béton.

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References

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Authors
  1. I. Soroka
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Soroka, I. On compressive strength variation in concrete. Mat. Constr. 4, 155–161 (1971). https://doi.org/10.1007/BF02479129

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  • DOI: https://doi.org/10.1007/BF02479129

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