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What is the difference between nominal mix and design mix?
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Answer Posted / harshal.s.khode
Nominal mixes are those proportioned by the volume of the
main ingredients and usually written in order of the
ingredients thus Cement:Sand: Coarse aggregate (stone,
chippings). So a 1:3:6 is a nominal mix containing 1 volume
of cement, 3 volumes of sand and 6 volumes of coarse
aggregate.
Gauge boxes are generally used to batch the ingredients.
The problem with these types of mixes is that the quality
of the concrete is entirely dependant on the quality of the
materials. In other words, if you use the same gauge boxes
to weigh ingredients from different sources, you will most
likely have different concrete qualities.
Designed mixes on the other hand are specified as a grade
the producer of the concrete has to achieve usually in
terms of compressive strength but may include other
criteria (size of the stone, minimum amount of cement,
flexural strength, air content etc). So a grade 30 concrete
will be the same whether batched in Kansas City, Karachi,
Kingston-Upon-Hull or Kinshasa
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