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Effects of the sole or combined use of chemical admixtures on properties of self-compacting concrete

Sevim Ozer, Kalkan Ilker, Demir Ilhami, Akgüngör Ali Payıdar

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 4

263--276

Chemical additives are very important in determining the behavioral characteristics of self-compacting concrete. For this reason, determining the building materials that make up the chemical structure of self-compacting concrete and the interactions of these materials is of great importance. The present study pertains to the effects of the use of different chemical admixtures (high-range water-reducing, i.e., superplasticizer, hydration accelerating, air-entraining, shrinkage reducing, and hydration heat reducing admixtures) on the fresh and hardened properties of self-compacting concrete. The influence of using a single one or a hybrid combination of the air-entraining, hydration-accelerating, heat-reducing, and shrinkage-reducing admixtures on the mechanical properties of fresh and hardened SCC was investigated through a set of tests. For this purpose, sixteen different SCC mixtures with different combinations of chemical additives were prepared and tested. The properties of fresh concrete were examined as well as the compressive and tensile strengths of the mixtures. SCC mixtures with shrinkage-reducing admixtures were evaluated in terms of shrinkage development. The effect of the use of admixtures was found to be more pronounced on the early-age concrete strength. The use of any type of additive in addition to the shrinkage-reducing admixture increased the speed of flow of fresh concrete.

Efekty uboczne stosowania domieszek napowietrzających do betonu i ich korygowanie

Gołaszewski J.

Magazyn Autostrady

2018

Nr 8-9

20--24

W artykule omówiono wpływ domieszek napowietrzających na właściwości reologiczne mieszanki betonowej i wytrzymałość betonu, współdziałanie domieszek napowietrzających z domieszkami reologicznymi oraz sposoby korygowania wpływu napowietrzenia na urabialność i wytrzymałość.

The article discusses the effect of air entraining admixtures on the rheological properties of a concrete mixture and the compressive strength of hardened concrete, the interaction of air entraining admixtures with rheological admixtures and methods to correct the influence of aeration on the workability and compressive strength of concrete.