Fine Aggregate Grading Check (ASTM C33)

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; it names which sieve is out of band, the widest consecutive gap, and the fineness modulus. An acceptance screen on your own C136 sieve analysis; the sieve report and the mix design govern.

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.

The §6 grading limits are the published acceptance criteria of a material specification adopted by reference into the building code, not a proprietary lookup table; the percent-passing values are the user's own ASTM C136 sieve analysis. The fineness-modulus leg is computed by the companion tile.

Estimate. AHJ and licensed professional govern.

Field names used by the API: p38, p4, p8, p16, p30, p50, p100, fm, max_retained_pct

• Grading bands the 7 fine-aggregate percent-passing limits of ASTM C33 §6.1ASTM C33
• Consecutive-sieve limit not more than 45% passing any sieve and retained on the next consecutive sieveASTM C33 §6.2
• Fineness modulus 2.3-3.1, delegated to the fineness-modulus tile so the two cannot driftASTM C33 §6.2