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What is difference between nominal mix and design mix?
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Answer Posted / girish negi
Nominal Mixes
In the past the specifications for concrete prescribed the
proportions of cement, fine and coarse aggregates. These
mixes of fixed cement-aggregate ratio which ensures adequate
strength are termed nominal mixes. These offer simplicity
and under normal circumstances, have a margin of strength
above that specified. However, due to the variability of mix
ingredients the nominal concrete for a given workability
varies widely in strength.
Designed Mixes
In these mixes the performance of the concrete is specified
by the designer but the mix proportions are determined by
the producer of concrete, except that the minimum cement
content can be laid down. This is most rational approach to
the selection of mix proportions with specific materials in
mind possessing more or less unique characteristics. The
approach results in the production of concrete with the
appropriate properties most economically. However, the
designed mix does not serve as a guide since this does not
guarantee the correct mix proportions for the prescribed
performance.
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