Road Surface Effects

[FW17]

Have a look at page 13!

Google for porous asphalt or offenporiger asphalt, if you want to see some pictures.

http://www.youtube.com/watch?v=I16WGau3jxE

Thanks, that video is awesome.

Tilke has not used this in any of the circuits, any possible reason why (other than BE's fetish for wet races)?


Page 13

[Richard]

That might be OK for a car park, but on a road you'd want porous asphalt for the wearing course but solid layers underneath. The reason is that if you have water running through the full depth pavement it can wash away the fines particles in the sub-base or the underlying ground leading to risk of settlement. Having a solid layer underneath means the water can be caught in a drain at the side to avoid that damage.

Also the porous asphalt does clog up with silt with time. If that happens then the presence of drains at the side mean the water is still managed even when the asphalt is clogged. Maintenance is a simple matter of a new porous wearing course overlay (or replacement).

[FW17]

That might be OK for a car park, but on a road you'd want porous asphalt for the wearing course but solid layers underneath. The reason is that if you have water running through the full depth pavement it can wash away the fines particles in the sub-base or the underlying ground leading to risk of settlement. Having a solid layer underneath means the water can be caught in a drain at the side to avoid that damage.

Also the porous asphalt does clog up with silt with time. If that happens then the presence of drains at the side mean the water is still managed even when the asphalt is clogged. Maintenance is a simple matter of a new porous wearing course overlay (or replacement).

Sub-base - WBM and GSB are both porous to different degrees, they have just provided a sub soil drain system in this case to drain the water.

Silt? Not sure if it passes through the pores in the wearing course.

[Rennsport_helgi]

What's going to happen to that asphalt if the temperature is slightly bellow zero?

[FW17]

New groove cut asphalt at the Interlagos to facilitate drainage