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Line 1: − <ul>+ − <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> − <li>The 20 mm clear crushed aggregate permits the use of an overlaid layer of high performance bedding (HPB) as a choker layer.</li> − <li>The void space ratio should be > 0.35 (or > 35%)</li> − </ul> − All gravel should meet the following criteria: − <ul> − <li>Maximum wash loss of 0.5%</li> − <li>Minimum durability index of 35</li> − <li>Maximum abrasion of 10% for 100 revolutions and maximum of 50% for 500 revolutions</li> − </ul> − −
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#REDIRECT [[Aggregates]]
[[Category:materials]]