Difference between revisions of "Gravel"

From LID SWM Planning and Design Guide
Jump to navigation Jump to search
Line 1: Line 1:
<p>All aggregates should meet the following criteria:
All aggregates should meet the following criteria:
<ul>
<ul>
<li>Maximum wash loss of 0.5%.</li>
<li>Maximum wash loss of 0.5%.</li>
Line 5: Line 5:
<li>Maximum abrasion of 10% for 100 revolutions and maximum of 50% for 500 revolutions.</li>
<li>Maximum abrasion of 10% for 100 revolutions and maximum of 50% for 500 revolutions.</li>
</ul>
</ul>
Granular material for underdrains should be clear crushed 50 mm diameter stone graded in accordance with ASTM D 2940. The void space ratio shall be 0.4 .</p>
====Underdrains====
<ul>
<li>Granular material for underdrains should be clear crushed 50 mm diameter stone graded in accordance with ASTM D 2940. </li>
<li>The void space ratio shall be 0.4 .</li>
<li>A 100 mm layer of smaller grade pea gravel should be laid over the clear stone to reduce the chance of puncture damage to geotextile fabric. </li>
</ul>
 
 
 
 
[[Category:materials]]
[[Category:materials]]

Revision as of 21:04, 5 July 2017

All aggregates 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.

Underdrains[edit]

  • Granular material for underdrains should be clear crushed 50 mm diameter stone graded in accordance with ASTM D 2940.
  • The void space ratio shall be 0.4 .
  • A 100 mm layer of smaller grade pea gravel should be laid over the clear stone to reduce the chance of puncture damage to geotextile fabric.