A method of mixture proportioning of fly ash concretes is presented. The method is based on the
strength and flow data of a minimum of nine fly ash-cement mortars. The essence of the method is
that three fly ash-binder ratios are to be combined with three water-binder ratios in the range of
interest. The strength and water demand data are analyzed for constructing mixture proportion
charts. The strength vs. water-binder ratio charts are prepared by down-scaling the 50-mm
mortar strength to the 150-mm standard concrete cylinders. The method is illustrated with the
help of examples. The trial mixtures proportioned using the proposed method have reasonably
achieved the 28 day target strengths.
