Abstract
With a view to verifying the feasibility of evaluating early concrete strength, an extensive experimental program was developed for testing the strength of steam-cured 8 cm concrete cubes after 17 hours (R a ) and comparing the results with the strength of 15 cm cubes at 28 days (R s ). The relationship of R a to R s depends on the steam curing cycle, on the maximum aggregate size and its influence in relation to sample size, and on the rate of loading during the test. The R a -R s regression line was calculated for different concrete mixes using various types of cement (to Italian standards), i.e., Portland 325 and 425, pozzolana 325 with fly ash and Portland 325 with a superplasticizing admixture. A linear relationship generally proved reliable as R s =mR a +c, where m and c are constants depending on the type of cement, the curing cycle and the maximum aggregate size. The coefficient of variation was about 4–5%, reaching 6% when all concrete mixes tested were considered.
Resume
Ce vaste programme expérimental visait à connaître la résistance du béton le plus tôt possible après le bétonnage. En utilisant un traitement de maturation à la vapeur, on a établi un rapport entre la résistance d'un cube de 8 cm de côté, après 17 heures (Ra) et celle d'un cube de 15 cm de côté après 28 jours (Rs). Ce rapport dépend du cycle thermique, du diamètre maximum du gravier, et de son influence sur les dimensions des échantillons ainsi que de la rapidité d'exécution de l'essai. On donne la régression Ra-Rs pour différents types de béton en utilisant des ciments conformes aux normes italiennes: Portland 325 et 425, pozzolana 325 aux cendres volantes, Portland 325 avec un superplastifiant. Cette expérimentation prouve qu'il existe une relation linéaire Ra=mRa+c où m et c sont les deux constantes liées au type de ciment, au cycle thermique et à la dimension du gravier, avec un coefficient de variation de 4–5% environ et un maximum de 6%, en cas d'utilisation de toutes les valeurs trouvées.
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Siviero, E. Evaluation of early concrete strength. Materials and Structures 27, 273–284 (1994). https://doi.org/10.1007/BF02473044
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DOI: https://doi.org/10.1007/BF02473044