A new method for the mix design of medium strength flowing concrete with low cement content

摘要

The market for medium strength (28-35 MPa) concrete with high workability is recently increasing due to its qualitative and cost-saving advantages. This paper proposes a new mix design method for medium strength flowing concrete (FC) with low cement content. The proposed method determines the packing factor (aggregate content) first, and then fills binding paste containing fly ash and GGBS into the voids between aggregates to make concrete that has the desired workability and strength. Tests on slump, slump flow, and compressive strength were carried out and the results indicate that medium strength FC can be produced successfully using this method. Concrete mixtures designed by using the proposed method requires a small quantity of binder and is therefore very economical.