Difference between revisions of "Specifications for materials under permeable pavement surface"
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*Pervious concrete: None | *Pervious concrete: None | ||
*Porous asphalt: 1inch of AASHTO No. 57 stone | *Porous asphalt: 1inch of AASHTO No. 57 stone | ||
| − | *PICP: | + | *PICP: 2 inches of [http://www.transportation.org/Pages/default.aspx AASHTO] No. 8 stone ([http://www.dot.state.mn.us/pre-letting/spec/2005/3101-3491.pdf MnDOT 3127FA-3])</td> |
<td>Washed free of fines</td> | <td>Washed free of fines</td> | ||
</tr> | </tr> | ||
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<td> | <td> | ||
*Pervious concrete: AASHTO No. 57 stone or per hydraulic design | *Pervious concrete: AASHTO No. 57 stone or per hydraulic design | ||
| − | *Porous asphalt:AASHTO No. 2, 3, or 5 | + | *Porous asphalt:AASHTO No. 2, 3, or 5 stone |
| − | *PICP: | + | *PICP: 4 inches of AASHTO No. 57 base and AASHTO No.2, 3 or 4 stone subbase</td> |
<td>Stone layer thickness based on the pavement structural and hydraulic requirements. Stonewashed and free of fines. Recommended minimum void ratio = 0.4.</td> | <td>Stone layer thickness based on the pavement structural and hydraulic requirements. Stonewashed and free of fines. Recommended minimum void ratio = 0.4.</td> | ||
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>Underdrain (optional)</td> | <td>Underdrain (optional)</td> | ||
| − | <td colspan="2">Use 4 to 6 inch diameter perforated PVC (AASHTO M-252) pipe or corrugated polyethylene pipe. | + | <td colspan="2">Use 4 to 6 inch diameter perforated PVC (AASHTO M-252) pipe or corrugated polyethylene pipe. Perforated pipe installed for the full length of the permeable pavement cell, and non-perforated pipe, as needed,connected to storm drainage system.</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>Filter Layer (optional)</td> | <td>Filter Layer (optional)</td> | ||
| − | <td>Sand filter layeris separated from base above and native soils with geotextile. Sand layer typically ASTM C33 gradation, 6 to 12 inches thick.</td> | + | <td>Sand filter layeris separated from base above and native soils with geotextile. Sand layer typically [http://www.astm.org/ ASTM] C33 gradation, 6 to 12 inches thick.</td> |
<td>The sand layer may require a choker layer on surface to provide transition to base layerstone.</td> | <td>The sand layer may require a choker layer on surface to provide transition to base layerstone.</td> | ||
</tr> | </tr> | ||
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<tr> | <tr> | ||
<td>Impermeable Liner</td> | <td>Impermeable Liner</td> | ||
| − | <td colspan="2">Use a minimum 30mil PVC liner covered by 12 ounce/square yard non-woven geotextile. EPDM | + | <td colspan="2">Use a minimum 30mil PVC liner covered by 12 ounce/square yard non-woven geotextile. [[Glossary|EPDM]] and [[Glossary|HDPE]] liner material is also acceptable.</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>Observation Well</td> | <td>Observation Well</td> | ||
| − | <td colspan="2">Use a perforated 4 to 6 inch vertical PVC pipe (AASHTO M-252) with a lockable cap, installedflush with the surface (or under pavers).</td> | + | <td colspan="2">Use a perforated 4 to 6 inch vertical [[Glossary|PVC]] pipe (AASHTO M-252) with a lockable cap, installedflush with the surface (or under pavers).</td> |
</tr> | </tr> | ||
</table> | </table> | ||
Revision as of 19:42, 4 February 2013
Link to this table
| Bedding/choker layer |
|
Washed free of fines |
| Reservoir Layer |
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Stone layer thickness based on the pavement structural and hydraulic requirements. Stonewashed and free of fines. Recommended minimum void ratio = 0.4. |
| Underdrain (optional) | Use 4 to 6 inch diameter perforated PVC (AASHTO M-252) pipe or corrugated polyethylene pipe. Perforated pipe installed for the full length of the permeable pavement cell, and non-perforated pipe, as needed,connected to storm drainage system. | |
| Filter Layer (optional) | Sand filter layeris separated from base above and native soils with geotextile. Sand layer typically ASTM C33 gradation, 6 to 12 inches thick. | The sand layer may require a choker layer on surface to provide transition to base layerstone. |
| Geotextile(optional) | Comply with AASHTO M-288 Standard Specification for Geotextile Specification for Highway Applications, drainage and separation applications, Class I or II. Porous asphalt industry recommends non-woven geotextile. | |
| Impermeable Liner | Use a minimum 30mil PVC liner covered by 12 ounce/square yard non-woven geotextile. EPDM and HDPE liner material is also acceptable. | |
| Observation Well | Use a perforated 4 to 6 inch vertical PVC pipe (AASHTO M-252) with a lockable cap, installedflush with the surface (or under pavers). | |