Controlled Concrete Definition

WHAT IS THE DIFFERENCE BETWEEN NOMINAL MIX AND DESIGN MIX CONCRETE? Mix design is a process of selecting suitable ingredients and determining their relative proportions with the objective of producing concrete of having certain minimum workability, strength and durability as economically as possible. Concrete A mix design can be designed in two ways as explained below Nominal Mix Design NOMINAL MIX It is used for relatively unimportant and simpler concrete works. In this type of mix, all the ingredients are prescribed and their proportions are specified. Therefore there is no scope for any deviation by the designer. Nominal mix concrete may be used for concrete of M-20 or lower. The various ingredients are taken as given in the table below Grade Max. quantity of dry Aggregates per 50 kg of cement Fine Aggregate to Coarse Aggregate Ratio, by mass Max. Quantity of water in litres M-5 800 Generally 1:2 but may varies from 1:1.5 to 1:2.5 60 M-7.5 625 45 M-10 480 34...