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What is the difference between “Maximum size” and “nominal maximum size” of aggregates?

The smallest sieve opening through which the entire amount of aggregate is required to pass is called the maximum size.

The smallest sieve opening through which the entire amount of aggregate is permitted to pass is called the nominal maximum size.

For example, for the aggregate meeting the specification limits shown below would have a maximum size of 37.5 mm (1-1/2 in.) and a nominal maximum size of 25.0 mm (1 in).

Sieve Size Specification limits: percentage passing
37.5 mm 100
25 mm 95-100
12.5 mm 25-60
4.75 mm 0-10
2.36 mm 0-5

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