Abstract
In this study, relations between aggregate movement and its characteristics such as grading, maximum size, particle shape and specific gravity were examined in relation to various mix proportions. Fine and coarse glass beads, natural sand and gravel, artificial lightweight coarse aggregate, cement mortar model coarse aggregate and steel balls were used. If the specific gravity of coarse aggregate is larger than that of the mortar mixture, fine particles float to the upper part and coarse ones settle to the lower part, and if the specific gravity of coarse aggregate is smaller than that, reversed movements were observed. The larger the specific gravity of coarse aggregate, the more the degree of settling particles to total ones. The larger the maximum size of aggregate, the larger the size of floating particles. Settling degree in the order of magnitude, is cubic, rounded and flat prismatic particle. Proper sand percentage that gives the minimum movements exists for each kind of aggregate.
Résumé
Dans ces recherches, les relations entre le mouvement et des caractéristiques comme la granularité, la dimension maximale, la forme des grains et la masse volumique ont été étudiées en fonction des proportions de divers mélanges. Des petites et grandes billes de verre, des granulats naturels, des granulats légers, des granulats de mortier moulé et des billes de fer ont été, utilisés. Si la masse volumique des gros granulats est moins grande que celle du mortier de ciment, les grains fins montent et les grains grossiers descendent. Si la masse volumique des gros granulats est moins grande que celle du mortier, des phénomènes opposés sont observés. La proportion de grains descendus est d'autant plus grande que la masse volumique des gros granulats est plus élevée. La dimension des grains montés est d'autant plus grande que la dimension maximale du granulat est plus grande.
La proportion de grains descendus en fonction de la forme se classe dans l'ordre décroissant suivant: cubes, billes, grains plats et longs. Il existe un pourcentage optimal de sable pour chaque granulat pour obtenir une ségrégation minimale.
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Reference
KAGAYA M., TOKUDA H., KAWAKAMI M. and KAMAGAI M. (1981): Movement of Aggregate Particles in Concrete Due to Vibrating Compaction, CAJ Review of the Thirty-fifth General Meeting, Vol. 35, pp. 353–356 (in Japanese).
KAGAYA M., TOKUDA H. and KAWAKAMI M. (1982): Segregation of AE Concrete Due to Vibrating Compaction, CAJ Review of the Thirty-sixth General Meeting Vol. 36, pp. 385–388 (in Japanese).
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Makoto, K., Hiroshi, T. & Makoto, K. Influence of aggregate characteristics on movement of the particle in concrete due to vibrating compaction. Bulletin of the International Association of Engineering Geology 30, 249–253 (1984). https://doi.org/10.1007/BF02594318
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DOI: https://doi.org/10.1007/BF02594318