Difference between revisions of "Gravel"

Revision as of 11:27, 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

@@ Line 1: / Line 1: @@
-<ul>
+For advice on decorative surface aggregates see [[Stone]]
-<li>Granite is generally recommended over limestone for all drainage applications. Granite is both more chemically stable, and more resistant to crushing over time. </li>
-<li>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].</li>
+*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],
-<li>The 20 mm clear crushed aggregate permits the use of an overlaid layer of high performance bedding (HPB) as a choker layer.</li>
+*The 20 mm clear crushed aggregate permits the use of an overlaid layer of high performance bedding (HPB) as a choker layer,
-<li>The void space ratio should be > 0.35 (or > 35%)</li>
+*The void space ratio should be > 0.35 (or > 35%)
-</ul>
 All gravel should meet the following criteria:
-<ul>
+*Maximum wash loss of 0.5%
-<li>Maximum wash loss of 0.5%</li>
+*Minimum durability index of 35
-<li>Minimum durability index of 35</li>
+*Maximum abrasion of 10% for 100 revolutions and maximum of 50% for 500 revolutions
-<li>Maximum abrasion of 10% for 100 revolutions and maximum of 50% for 500 revolutions</li>
-</ul>
 [[Category:materials]]