Difference between revisions of "Gravel"
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− | + | For advice on decorative surface aggregates see [[Stone]] | |
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− | + | *Granular material for underdrains should be clear crushed 20 or 50 mm diameter stone graded in accordance with [https://www.astm.org/Standards/D2940.htm ASTM D 2940], | |
− | + | *The 20 mm clear crushed aggregate permits the use of an overlaid layer of high performance bedding (HPB) as a choker layer, | |
− | + | *The void space ratio should be > 0.35 (or > 35%) | |
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All gravel should meet the following criteria: | All gravel should meet the following criteria: | ||
− | + | *Maximum wash loss of 0.5% | |
− | + | *Minimum durability index of 35 | |
− | + | *Maximum abrasion of 10% for 100 revolutions and maximum of 50% for 500 revolutions | |
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[[Category:materials]] | [[Category:materials]] |
Revision as of 15:27, 21 September 2017
For advice on decorative surface aggregates see Stone
- Granular material for underdrains should be clear crushed 20 or 50 mm diameter stone graded in accordance with ASTM D 2940,
- The 20 mm clear crushed aggregate permits the use of an overlaid layer of high performance bedding (HPB) as a choker layer,
- The void space ratio should be > 0.35 (or > 35%)
All gravel should meet the following criteria:
- Maximum wash loss of 0.5%
- Minimum durability index of 35
- Maximum abrasion of 10% for 100 revolutions and maximum of 50% for 500 revolutions