No. 68 Stone: Size, Weight and Gradation
No. 68 stone has a nominal size of 3/4 in to No. 8 and weighs about 1.31 to 1.56 tons per cubic yard. Convert any amount below.
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No. 68 gradation
AASHTO M43 and ASTM D448 define No. 68 by how much passes each sieve. Ohio DOT lists its nominal size as 3/4 in to No. 8.
| Sieve | Opening | Percent passing |
|---|---|---|
| 1 in | 25.0 mm | 100 |
| 3/4 in | 19.0 mm | 90-100 |
| 3/8 in | 9.5 mm | 30-65 |
| No. 4 | 4.75 mm | 5-25 |
| 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. 68 weighs
FHWA measured the dry unit weight of No. 68 at 96.9 lb per cubic foot loose and 115.9 lb dense. That is 2,616 to 3,130 lb, or 1.31 to 1.56 tons, per cubic yard.
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 | 1.31 tons | 1.56 tons |
| 2 cu yd | 2.62 tons | 3.13 tons |
| 5 cu yd | 6.54 tons | 7.82 tons |
| 10 cu yd | 13.1 tons | 15.6 tons |
Common questions
What size is No. 68 stone?
Its nominal size is 3/4 in to No. 8. The largest sieve it fully passes is 1 in (25.0 mm).
How much does a yard of No. 68 stone weigh?
FHWA's tests give 2,616 to 3,130 lb per cubic yard, from loose to dense.
How many yards are in a ton of No. 68 stone?
0.64 to 0.76 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