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Sep 12, 2005018332A 89 aggregate has the following gradation 12inch sieve100 passing 38inch90 to 100 No. 4 sieve20 to 55 No. 8 sieve5 to 30 No. 16 sieve0 to 5 No. 50 sieve0 to 5. So all this simply means that a 57 stone is a coarser 1189inchminus graded aggregate and 89 gravel is a finer 189inchminus graded aggregate.
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