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This method has been developed by Road Research Laboratory, London and its detailed procedure has been explained in Road Note No. Hence the weights of materials per cubic metre of concrete are: The absolute volume of fine aggregate can be determined by subtracting the above weights from the weight of concrete. Thus the absolute volumes of water, coarse aggregate, are known. Now the water/cement ratio is chosen from strength as well as durability requirements and the quantity of cement is computed dividing water content by water/cement ratio. From given specific gravity of coarse aggregate, its absolute volume is determined. The absolute density in kg/m 3 is 1000 times larger than the specific gravity.Īfter fixing the maximum size and type of aggregate, the workability is determined with the help of water content obtained from given tables 20.23 and 20.24, and bulk volume of coarse aggregate from table 20.25. The fineness modulus of fine aggregate is 2.60and its specific gravity 2.58. The maximum size of aggregate used is 38 mm (1½”) its bulk density is 1600 kg/m and specific gravity 2.64. The actual procedure is explained with the help of the following example.Ĭoncrete of compressive strength of350 kg/Cm 2 (35 MPs) and 5 cms slump is required for a particular job, ordinary Portland cement being used. For other consistency the values of Table 20.23 should be multiplied by a factor given in Table 20.26. Table 20.25 gives the maximum bulk volume of coarse aggregate per unit volume of concrete. It is thus possible to start the mix design by selecting the water content from these tables.įurther it is also assumed that the optimum ratio of bulk volume of coarse aggregate to the total volume of concrete depends only on the maximum size of aggregate and on the grading of fine aggregate. Table 20.24 gives the actual content of water for a reference (plastic) consistency of table 20.23. The relative water contents for various work-abilities are given in Table 20.2.
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The American Concrete Institute (ACI) method is based on the fact that for a given maximum size of aggregate the water content in kilogram per cubic metre of concrete determines the workability of concrete mix, usually independent of the mix proportions. American Concrete Institute Method of Mix Design 5. The following points highlight the five methods of concrete mix design.