No. 8 Stone: Size, Weight and Gradation
No. 8 stone has a nominal size of 3/8 in to No. 8 and weighs about 1.16 to 1.52 tons per cubic yard. Convert any amount below.
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No. 8 gradation
AASHTO M43 and ASTM D448 define No. 8 by how much passes each sieve. Ohio DOT lists its nominal size as 3/8 in to No. 8.
| Sieve | Opening | Percent passing |
|---|---|---|
| 1/2 in | 12.5 mm | 100 |
| 3/8 in | 9.5 mm | 85-100 |
| No. 4 | 4.75 mm | 10-30 |
| No. 8 | 2.36 mm | 0-10 |
| No. 16 | 1.18 mm | 0-5 |
AASHTO M43-05 (ASTM D448) limits as tabled by FHWA.
How much No. 8 weighs
FHWA measured the dry unit weight of No. 8 at 85.7 lb per cubic foot loose and 112.8 lb dense. That is 2,314 to 3,046 lb, or 1.16 to 1.52 tons, per cubic yard. FHWA tested five No. 8 sources; the weight range here combines the two that were measured (8A and 8E).
FHWA notes that sizes larger than No. 9 classify as poorly graded gravels: the stones are mostly one size, which leaves open space between them.
| Amount | Loose | Dense |
|---|---|---|
| 1 cu yd | 1.16 tons | 1.52 tons |
| 2 cu yd | 2.31 tons | 3.05 tons |
| 5 cu yd | 5.79 tons | 7.61 tons |
| 10 cu yd | 11.6 tons | 15.2 tons |
Common questions
What size is No. 8 stone?
Its nominal size is 3/8 in to No. 8. The largest sieve it fully passes is 1/2 in (12.5 mm).
How much does a yard of No. 8 stone weigh?
FHWA's tests give 2,314 to 3,046 lb per cubic yard, from loose to dense.
How many yards are in a ton of No. 8 stone?
0.66 to 0.86 cubic yards.
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