Difference between revisions of "Gravel"

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All aggregates should meet the following criteria:
All aggregates 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>
====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>


*Granular material for underdrains should be clear crushed 50 mm diameter stone graded in accordance with ASTM D 2940.
*The void space ratio should be 0.4 (or 40%)
*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.


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[[Category:materials]]
[[Category:materials]]

Revision as of 13:48, 6 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.
  • Granular material for underdrains should be clear crushed 50 mm diameter stone graded in accordance with ASTM D 2940.
  • The void space ratio should be 0.4 (or 40%)
  • 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.