NDLI: A proposal for the prediction of the characteristic cube strength of concrete from tests on small cores of various diameters

Content Provider	Springer Nature Link
Author	Indelicato, F.
Copyright Year	1998
Abstract	A method is proposed for the assessment of characteristic cube strength, f$_{ck}$, based on tests performed on 28 mm diameter microcores, small 45 mm diameter cores, and 70 mm diameter cores. In particular, on the basis of the tests performed on the specimens (1270 between cubes and cores of the three diameters being considered, manufactured from 16 concrete types), relationships are defined which make it possible to estimate mean cube strength, $$\bar f_c$$ , with, a desired confidence level (1−α)%, starting from a mean core strength, $$\bar f_{28} ,\bar f_{45,} \bar f_{70} $$ . Subsequently, given a number of microcores, n$_{28}$, n$_{45}$, n$_{70}$, subject to compressive tests the proposed method makes it possible to determine the number of cubes n$_{c}$ necessary to evaluate the mean cube strength with the same confidence level, and characteristic strength with a good approximation. Finally, having worked out the one-side tolerance factor, k, f$_{ck}$ is evaluated with the aid of the estimated value of $$\bar f_c$$ , the calculated value of k, and an estimate of the mean standard deviation on cubes, s$_{ c }$, as determined from the core tests.On présente une méthode d’évaluation de la résistance caractéristique sur cube,f $_{ ck }$, sur la base d’essai sur des microcarottes de 28 mm de diamètre, de petites carottes de 45 mm de diamètre et sur des carottes de 70 mm de diamètre. Notamment, sur la base des essais réalisés sur 1 270 éprouvettes (des cubes et des carottes des trois diamètres mentionnées ci-dessus, fabriquées à partir de 16 bétons différents), on établit des rapport qui permettent d’estimer la résistance moyenne sur cube $$\bar f_c$$ avec un niveau de confiance voulu (1−α)%, à partir des résistances moyennes sur carottes $$\bar f_{28} ,\bar f_{45,} \bar f_{70} $$ . Ensuite, sur la base d’un certain nombre de microcarottes,n $_{28}$,n $_{45}$,n $_{70}$, soumises à l’expérimentation, on obtient le nombre de cubesn $_{ c }$ nécessaire pour estimer avec le même niveau de confiance les résistances moyennes sur cube et, avec une bonne approximation, les résistances caractéristiques. Enfin, après avoir obtenu le facteur de tolérance unilatéralek, on calcule la valeur estimée def $_{ ck }$ à l’aide la valeur estimée de $$\bar f_c$$ , de la valeur calculée dek, et d’une estimation de l’écart quadratique moyen sur les cubes,s $_{ c }$, obtenue des essais sur carottes.
Starting Page	242
Ending Page	246
Page Count	5
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	31
Issue Number	4
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Theoretical and Applied Mechanics Structural Mechanics Mechanical Engineering Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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