No. 9 Stone: Size, Weight and Gradation
No. 9 stone has a nominal size of No. 4 to No. 16 and weighs about 1.25 to 1.49 tons per cubic yard. Convert any amount below.
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No. 9 gradation
AASHTO M43 and ASTM D448 define No. 9 by how much passes each sieve. Ohio DOT lists its nominal size as No. 4 to No. 16.
| Sieve | Opening | Percent passing |
|---|---|---|
| 3/8 in | 9.5 mm | 100 |
| No. 4 | 4.75 mm | 85-100 |
| No. 8 | 2.36 mm | 10-40 |
| No. 16 | 1.18 mm | 0-10 |
| No. 50 | 0.300 mm | 0-5 |
AASHTO M43-05 (ASTM D448) limits as tabled by FHWA.
How much No. 9 weighs
FHWA measured the dry unit weight of No. 9 at 92.3 lb per cubic foot loose and 110.7 lb dense. That is 2,492 to 2,988 lb, or 1.25 to 1.49 tons, per cubic yard.
FHWA classifies No. 9 and No. 10 as poorly graded sands; the larger sizes are poorly graded gravels.
| Amount | Loose | Dense |
|---|---|---|
| 1 cu yd | 1.25 tons | 1.49 tons |
| 2 cu yd | 2.49 tons | 2.99 tons |
| 5 cu yd | 6.23 tons | 7.47 tons |
| 10 cu yd | 12.5 tons | 14.9 tons |
Common questions
What size is No. 9 stone?
Its nominal size is No. 4 to No. 16. The largest sieve it fully passes is 3/8 in (9.5 mm).
How much does a yard of No. 9 stone weigh?
FHWA's tests give 2,492 to 2,988 lb per cubic yard, from loose to dense.
How many yards are in a ton of No. 9 stone?
0.67 to 0.80 cubic yards.
Related calculators
Sources
- https://www.fhwa.dot.gov/publications/research/infrastructure/structures/bridge/15034/003.cfm
- https://spinternet.dot.state.oh.us/Divisions/ConstructionMgt/OnlineDocs/Specifications/2005CMS/700/703.htm