Difference between revisions of "Gravel"

Revision as of 20:37, 5 March 2018

Did you want an article on Reservoir gravel or finer gravel?

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-For advice on decorative surface aggregates see '''[[Stone]]'''
+Did you want an article on [[Reservoir gravel]] or [[choking layer|finer gravel]]?
-*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%)
-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
-[[Category:materials]]