The goal of the following example is too show the basic steps and how important minor changes in proportions. The relationship between strength and water cement ratio should be preferably. The specified design strength of concrete is 30 mpa at 28 days measured on standard cylinders. Page 17 531 0410 53 mix design methods 531 concrete mix design 1 scope this method covers the procedure for designing concrete mixes and is based.
The concrete mix design involves various steps, calculations and laboratory testing to find right mix proportions. Proportioning of concrete mixtures using this method. Concrete mix design is the process of finding the proportions of concrete mix in terms of ratios of cement, sand and coarse aggregates. Calculation of cement content once the water content and the wc ratio is determined, the amount of cement per unit volume of the concrete is found by dividing the estimated water content by the wc ratio. Concrete is the single most widely used material in the world. You will also need to define the aggregate size required for the mix design. Data to be collected design a concrete mix for construction of an elevated water tank. Pdf computation method for concrete mix design using simple. Determine the mean target strength ft from the specified characteristic compressive strength at 28day fck and the level of quality control.
Since doe method presently is the standard british method of concrete mix design, the procedure involved in this method is described instead of out dated road note no 4 method. Calculations for determining the percent passing the no. Obtain the water cement ratio for the desired mean target using the empirical relationship between compressive. The engineer shall submit information for concrete mix designs to the. Concrete mix design is the process of finding right proportions of cement, sand and aggregates for concrete to achieve target strength in structures. Any mix design procedure will provide a first approximation. Designing concrete mixtures there are three phases in the development of a concrete mixture. A mix design procedure for highperformance concrete mixes has been. Contractor concrete mix design approval procedure 1.