Water cement ratio is typically indicated as w/c. It is calculated by dividing the mass of the mixing water by the mass of the cement. It refers to the ratio corresponding to the saturated surface dry condition of aggregates.
Water cementitious ratio is typically indicated as w/cm. It is calculated by dividing the mass of the mixing water by the combined mass of the cement and fly ash or other cementitious materials or a combination thereof. It refers to the ratio corresponding to the saturated surface dry condition of aggregates.
