Abstract
Experimental data are presented which suggest that the development of compressive strength of fly ash concretes can be explained by superposition of two independent mechanical pore-filling mechanisms in the cement—fly ash paste. It is also suggested that the traditional water/cement ratio law for ordinary Portland cement concretes can be applied to fly ash concretes, provided that a slight modification is introduced. This will be of assistance in the design of fly ash concrete mixes for compressive strength.
Resume
Les résultats expérimentaux présentés suggèrent que le développement de la résistance à la compression des bétons aux cendres volantes peut s'expliquer par la superposition de deux mécanismes indépendants l'un de l'autre qui déterminent le remplissage des pores dans la pâte de ciment. L'un des mécanismes est dû à l'hydratation du ciment Portland, et l'autre à l'hydratation de la cendre volante et de l'hydroxyde de calcium libéré par l'hydratation du ciment Portland.
Le rapport eau/ciment pour les bétons à ciment Portland ordinaire peut s'appliquer aux bétons aux cendres volantes, à condition d'introduire une légère modification qui tienne compte de l'effet pouzzolanique supplémentaire dû aux cendres volantes sur le développement de la résistance du béton. Cet article aidera les ingénieurs à doser les mélanges de bétons aux cendres volantes pour la résistance à la compression.
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References
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Hedegaard, S.E., Hansen, T.C. Modified water/cement ratio law for compressive strength of fly ash concretes. Materials and Structures 25, 273–283 (1992). https://doi.org/10.1007/BF02472668
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DOI: https://doi.org/10.1007/BF02472668