Master Jobs Needed / Offered Discussion Thread

[rdenney]

You are correct that porous asphalt is not used often, lack of knowledge in placement and maintenance. I once designed a mix for highway use over a concrete surface, the mix performed very well but no one expected the soft grass shoulder and medium to become so soft that any vehicle entering would get stuck. So that leads me to my next point while these work very well the engineering for water runoff and collection are often overlooked. Another issue we dealt with in cold climates is use of sand on roadways and that can defeat the porous quality. Probably the main reason is cost, all porous asphalt mix’s require polymer modification.

The highway authority around here installed what they called "plant mix seal," which is porous asphalt, on a major local highway where it cross a ridge. The stuff worked really well. I wondered what it would take to keep it maintained, and soon enough I found out: They didn't keep it maintained. I think they used regular hot-mix at the last mill and overlay.

One thing is for certain: They apparently don't care much about drainage performance off the pavement surface.

Rick "hard to maintain, apparently" Denney

 

[Koeitje]

The highway authority around here installed what they called "plant mix seal," which is porous asphalt, on a major local highway where it cross a ridge. The stuff worked really well. I wondered what it would take to keep it maintained, and soon enough I found out: They didn't keep it maintained. I think they used regular hot-mix at the last mill and overlay.

One thing is for certain: They apparently don't care much about drainage performance off the pavement surface.

Rick "hard to maintain, apparently" Denney

I know it lasts only 10 years or so instead of the 15 for hard surfaces, but its so much nicer to drive on. Can't see shit when I drive on hard surfaces when it is raining or its wet. I guess we have the advantage that we only get a couple of days of snow a year and apart from that its just regular rain. Plus, our road network is probably the #1 or #2 in the world in terms of maintenance.

 

[Rit]

I know it lasts only 10 years or so instead of the 15 for hard surfaces, but its so much nicer to drive on. Can't see shit when I drive on hard surfaces when it is raining or its wet. I guess we have the advantage that we only get a couple of days of snow a year and apart from that its just regular rain. Plus, our road network is probably the #1 or #2 in the world in terms of maintenance.

I agree.