Abstract

KANNAN, V  and  GANESAN, K. Mechanical properties of self-compacting concrete with binary and ternary cementitious blends of metakaolin and fly ash. J. S. Afr. Inst. Civ. Eng. [online]. 2014, vol.56, n.2, pp.97-105. ISSN 2309-8775.

The main advantage of using ternary-blended concrete is to eliminate the drawbacks of the particular supplementary cementitious materials through combining with other superior quality material in order to reduce the overall cost of concrete production. It is also useful to enhance the structural properties of concrete. In this paper, fresh state and mechanical properties of self-compacting concrete (SCC) with binary and ternary cementitious blends of metakaolin (MK) and fly ash (FA) were evaluated and their inter-relationships discussed. For this purpose, different mixtures were prepared with different amounts of MK and FA by substituting ordinary Portland cement (OPC) by 5% to 40% of MK or FA. As a result of increasing the percentage of MK, FA and MK+FA, the mechanical properties of SCC improved considerably. It was found that the specimen incorporating the ternary blend of cement with 15% MK and 15% FA showed better workability and mechanical properties than that of the normal SCC specimen without MK or FA. This blend was proved to be the optimum combination for achieving maximum synergic effect.

Keywords : Self-compacting concrete; fresh properties; strength; UPV; dynamic modulus of elasticity.

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