Fine Aggregate Grading Check (ASTM C33)
The full sieve-band acceptance the fineness modulus cannot see -- because two very different gradations can share an FM. ASTM C33 §6 passes a concrete sand only if THREE things hold on the same sieve analysis: §6.1 each of the 7 standard sieves is within its band (3/8 in 100, #4 95-100, #8 80-100, #16 50-85, #30 25-60, #50 5-30, #100 0-10); §6.2 no more than 45% is retained between any two consecutive sieves; and §6.2 the fineness modulus is 2.3-3.1. A sand can sit dead-center on FM and still fail -- a gap-graded sand that jumps 60% from the #16 to the #30 starves the mix of one size while its FM reads 3.05. Enter percent passing on each sieve; the tile names which sieve is out of band, the widest consecutive gap, and the FM (delegated to the fineness-modulus tile so the two cannot drift). An acceptance screen on your own C136 sieve analysis; the sieve report and the mix design govern.
Formula and source
ASTM C33 §6 fine-aggregate acceptance: §6.1 each sieve within its band (3/8 in 100, #4 95-100, #8 80-100, #16 50-85, #30 25-60, #50 5-30, #100 0-10); §6.2 no more than 45% retained between consecutive sieves; §6.2 fineness modulus 2.3-3.1.
ASTM C33/C33M §6 concrete-aggregate grading limits, by name; the sieve analysis and the mix design govern.
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