Advantages of RAWMAT® HDB » Vs. Compacted Clay
RAWMAT® HDB is a fundamental breakthrough in barrier technology, and leaves the factory as a complete, functioning system.
The following table explains the advantages of RAWMAT® HDB over Compacted Clay in more detail.
| Compacted Clay | RAWMAT® HDB |
|---|---|
| Placement and compaction of clay is a slow process. | RAWMAT® HDB is simply rolled out to install - 100m2 per roll. |
| On-site Quality Assurance difficult. | RAWMAT® HDB is manufactured in an ISO 9001 environment for consistent, factory-controlled quality. |
| Complex compaction required to repair sub-quality areas. | RAWMAT® HDB can be repaired simply on-site if damaged. |
| Heavy plant requirements to place and compact clay. | RAWMAT® HDB is installed using lightweight machinery. |
| Up to 1000mm depth of compacted clay reduces void space of site. | Gain of valuable void space (more profit per square metre). |
| Permeabililty at least 5 magnitudes more than RAWMAT® HDB. | Lower permeability : less leachate can escape. |
| Clay is less "tacky" and does not bond as well to any geomembrane. | Better synergistic effect (intimate contact with geomembrane). |
| Compaction of clay on slopes not as effective as with GCLs. | Easier to install on slopes. |
| Minimal quantities of clay per truck load – high transport/environmental costs. | 2700m2 delivered per load - reducing transport costs. |
| Difficult to compact if too dry/wet. | RAWMAT® HDB can be installed in most weather conditions. |
| Clay cracks and desicates but will not reseal. | Should RAWMAT® HDB dry out it does not crack. |
| Due to many of above factors programming/costs can fluctuate heavily. | Fixed costs are calculable and time is predictable. |
| Compacted Clay has a permeability of 1 x 10–7 m/sec. | RAWMAT® HDB has permeability as low as 1 x 10-14 m/sec. |
| CCLs are susceptible to Freeze/Thaw cycles. | RAWMAT® HDB is unaffected by Freeze/Thaw cycles. |
| CCLs are susceptible to Wet/Dry cycles. | RAWMAT® HDB is unaffected by Wet/Dry cycles. |
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All information contained within this site is given in good faith and is correct to the best of Rawell Environmental Ltd.'s knowledge. However, this information is not legally binding and may be changed at any time without notice. Rawell offer a free advisory service, please Contact Us for more details. RAWMAT® and RAWSEAL® are registered trademarks of Rawell Environmental Ltd.