Quote:
Originally Posted by Alex Mackinnon
The major cost is to the durability of the surface. 5 year product life instead of 10 apparently.
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The durability is not so much of an issue if an appropriate asphalt binder is used.
Some added costs for this product stem from the modified asphalt bitumen required to reduce abrasion loss, lime (As an anti-stripping additive) and, the actual placement method which differs slightly from more traditional hot mixes.
Lastly, no structural value is given to this asphalt layer when designing the road as the presence of air voids make it difficult to both quantify and justify. The entire purpose of this layer is to reduce traffic noise, nothing else.
makr3trkr - You are correct that this product was used on Nordel Hill however, the mix design is significantly different than that of the SFPR.
Keen eyes will notice the difference in OGFC structure near the FHB. Different projects, different mix designs.