Abstract
Hardness tests of concretes are used, for the present, only for comparison, and the values of hardness obtained do not meet the requirements of reproducibility. An attempt has been made to develop an experimental method which could measure accurately the hardness characteristics of concrete and reproduce them. The most disseminated method, that of the steel ball indenter, was used. The relationship between concrete hardness on the one hand and the indenter diameter and test load on the other was established on the basis of earlier ideas on the structure and mechanical resistance features of the material and the possibility was demonstrated of using conventional micro and macro hardness test data for this estimation. The influence of methodological and technological factors in hardness testing was examined.
Resume
Comme on le sait, à l'heure actuelle, on utilise des essais de dureté seulement aux fins de comparaison, et les valeurs obtenues ne correspondent pas aux critères de reproductibilité. On a entrepris de développer une méthode expérimentale permettant de mesurer avec précision les caractéristiques de dureté et de les reproduire. On a utilisé la méthode la plus courante de l'essai de pénétration d'une bille d'acier. Sur la base de connaissances préalables de la construction et des caractéristiques de résistance mécanique du matériau, et de la possibilité d'utiliser des données d'essai conventionnelles de micro et de macro dureté comme moyen d'évaluation, on a établi la relation entre la dureté du béton d'une part, et le diamètre de l'empreinte et le chargement d'essai d'autre part. On a examiné l'influence des facteurs méthodologiques et technologiques dans l'essai de dureté.
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References
Davidenkov, N. N., ‘Some Problems in Mechanics of Materials’ (Lenizdat, Leningrad, 1943, in Russian).
Grigorovich, V. K., ‘Hardness and Microhardness of Materials’ (Nauka, Moscow, 1976, in Russian).
Kholmyansky, M. M., ‘Characterization of concrete as a building material’,Proc. VNII Zhelezobeton’, No. 23 (Stroyizdat, Moscow, 1979, in Russian), pp. 183–200.
Aliev, Sh. A., Kogan, E. A. and Kholmyansky, M. M., ‘Strength of concrete as a statistically non-homogeneous and discontinuous material’, ‘Baku, Ildrym’ (Polytechnic Inst. of Azerbaidjan, 1989, in Russian).
Bazant, Z., ‘Instability, ductility and size effect in strainsoftening concrete’,J. Engng Mech. Divn, Proc. ASCE,102 (1978) 331–344.
Bazant, Z., ‘Mechanics of distributed cracking’,Appl. Mech. Revs 39, No. 5 (1986).
Lin-Keun-Kim and Seok-Hong Eo, ‘Size effect in concrete specimens with dissimilar initial cracks’,Mag. Concr. Res. 42, No. 157 (1990).
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Kholmyansky, M., Kogan, E. & Kovler, K. On the hardness determination of fine grained concrete. Materials and Structures 27, 584–587 (1994). https://doi.org/10.1007/BF02473127
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DOI: https://doi.org/10.1007/BF02473127