New road surfaces
Discussion
Yes on finished surfaces, I'm not suggesting they should be aligned to the nearest millimetre, but some effort would be nice. A two inch deep pot hole wouldn't be acceptable, so why is a two inch deep man hole cover? (ranting myself now 
)
These "raised ironworks" you mention, I saw a bloke taking photos of a rather large raised grid, he had obviously hit it in his lowered chav Corsa; where would he stand if he tries to claim off the council? There was adequate warning signs.
)These "raised ironworks" you mention, I saw a bloke taking photos of a rather large raised grid, he had obviously hit it in his lowered chav Corsa; where would he stand if he tries to claim off the council? There was adequate warning signs.
GaryST220 said:
Yes on finished surfaces, I'm not suggesting they should be aligned to the nearest millimetre, but some effort would be nice. A two inch deep pot hole wouldn't be acceptable, so why is a two inch deep man hole cover? (ranting myself now )
These "raised ironworks" you mention, I saw a bloke taking photos of a rather large raised grid, he had obviously hit it in his lowered chav Corsa; where would he stand if he tries to claim off the council? There was adequate warning signs.
In my opinion, he wouldn't have a leg to stand on. If there are "Raised Ironworks", "Ramp", etc signs, in addition to the other works signs, then drivers are assumed to drive to the conditions. It's like a driver trying to ford a river and flooding his car. The white on red signs are just as much a part of the highway code as more standard signs.)These "raised ironworks" you mention, I saw a bloke taking photos of a rather large raised grid, he had obviously hit it in his lowered chav Corsa; where would he stand if he tries to claim off the council? There was adequate warning signs.
Fully agree on your rant, 100%. The road on approach to my house has every cover about 2 inches down, and it jars the shizzle out of my wagon. Local authorities!
<Techie Mode On> I'm not sure I'd agree with the comments about concrete roads being cheaper than asphalt, if that were the case why aren't all major schemes done with a concrete base (CRCR) and overlaid with a thin asphalt surface course to reduce the noise? Also concrete carriageways have maintenance problems that can be very difficult and expensive to fix. Asphalt ones are generally cheaper to maintain.
Also I have measured the psv of calcined bauxite and it's not that high, usually around 68. The mechanism by which calcined bauxite develops skid resistance is completely different from that of an asphalt surface. The very small aggregate size in combination with the very angular particle shape give the very high levels of friction. However they do polish as they are on the most highly stressed sections of road and can also suffer aggregate loss, both of which reduce skid resistance. <Techie Mode Off>
Never thought I'd be discussing this on Pistonheads!
Also I have measured the psv of calcined bauxite and it's not that high, usually around 68. The mechanism by which calcined bauxite develops skid resistance is completely different from that of an asphalt surface. The very small aggregate size in combination with the very angular particle shape give the very high levels of friction. However they do polish as they are on the most highly stressed sections of road and can also suffer aggregate loss, both of which reduce skid resistance. <Techie Mode Off>
Never thought I'd be discussing this on Pistonheads!
Vlad the Imp said:
<Techie Mode On> I'm not sure I'd agree with the comments about concrete roads being cheaper than asphalt, if that were the case why aren't all major schemes done with a concrete base (CRCR) and overlaid with a thin asphalt surface course to reduce the noise? Also concrete carriageways have maintenance problems that can be very difficult and expensive to fix. Asphalt ones are generally cheaper to maintain.
Also I have measured the psv of calcined bauxite and it's not that high, usually around 68. The mechanism by which calcined bauxite develops skid resistance is completely different from that of an asphalt surface. The very small aggregate size in combination with the very angular particle shape give the very high levels of friction. However they do polish as they are on the most highly stressed sections of road and can also suffer aggregate loss, both of which reduce skid resistance. <Techie Mode Off>
Never thought I'd be discussing this on Pistonheads!
The CRCR part - well, I've used concrete roads before where we've had very soft underlying ground conditions. Reinforced concrete acts as a "bridge" over soft ground, and differential settlement shouldn't be as much of an issue. They did something similar (IIRC) at Clacketts Lane, in the mid 90's. Noise isn't an issue on larger motorways/roads, running away from towns, but I agree that most bypasses etc now are blacktop for noise purposes. Also I have measured the psv of calcined bauxite and it's not that high, usually around 68. The mechanism by which calcined bauxite develops skid resistance is completely different from that of an asphalt surface. The very small aggregate size in combination with the very angular particle shape give the very high levels of friction. However they do polish as they are on the most highly stressed sections of road and can also suffer aggregate loss, both of which reduce skid resistance. <Techie Mode Off>
Never thought I'd be discussing this on Pistonheads!
Agree with the concrete being potentially expensive to repair, if you have to oressure-grout beneath, or fix any joints etc.
I do, however, bow to your superior knowledge on the HFS. I've not "tested" it as such, I'm just a lowly highways engineer.
Hey, why not discuss it on PH? All our cars run on roads... no roads, no enjoyment of cars!
Admittedly concrete does work well on very soft ground as effectively what is built is a concrete raft that floats on the poor ground. Clackets was done in 1997ish in a concrete/asphalt sandwich construction as the existing carriageway was PQ slabs. There are now some very large longitudinal cracks that will need one of those expensive fixes before to long.
Occasionally I do get to combine cars with roads, I'm speaking at a conference later this year on surfacing of race tracks whick combines work with hobbies so I'm not a total anorak.
Occasionally I do get to combine cars with roads, I'm speaking at a conference later this year on surfacing of race tracks whick combines work with hobbies so I'm not a total anorak.
Vlad the Imp said:
Admittedly concrete does work well on very soft ground as effectively what is built is a concrete raft that floats on the poor ground. Clackets was done in 1997ish in a concrete/asphalt sandwich construction as the existing carriageway was PQ slabs. There are now some very large longitudinal cracks that will need one of those expensive fixes before to long.
Occasionally I do get to combine cars with roads, I'm speaking at a conference later this year on surfacing of race tracks whick combines work with hobbies so I'm not a total anorak.
Do you need an experienced highways designer on your staff?! I would LOVE to get a job working on the maintenance of racetracks. Occasionally I do get to combine cars with roads, I'm speaking at a conference later this year on surfacing of race tracks whick combines work with hobbies so I'm not a total anorak.
Opulent said:
Vlad the Imp said:
Admittedly concrete does work well on very soft ground as effectively what is built is a concrete raft that floats on the poor ground. Clackets was done in 1997ish in a concrete/asphalt sandwich construction as the existing carriageway was PQ slabs. There are now some very large longitudinal cracks that will need one of those expensive fixes before to long.
Occasionally I do get to combine cars with roads, I'm speaking at a conference later this year on surfacing of race tracks whick combines work with hobbies so I'm not a total anorak.
Do you need an experienced highways designer on your staff?! I would LOVE to get a job working on the maintenance of racetracks. Occasionally I do get to combine cars with roads, I'm speaking at a conference later this year on surfacing of race tracks whick combines work with hobbies so I'm not a total anorak.
Vlad the Imp said:
Opulent said:
Vlad the Imp said:
Admittedly concrete does work well on very soft ground as effectively what is built is a concrete raft that floats on the poor ground. Clackets was done in 1997ish in a concrete/asphalt sandwich construction as the existing carriageway was PQ slabs. There are now some very large longitudinal cracks that will need one of those expensive fixes before to long.
Occasionally I do get to combine cars with roads, I'm speaking at a conference later this year on surfacing of race tracks whick combines work with hobbies so I'm not a total anorak.
Do you need an experienced highways designer on your staff?! I would LOVE to get a job working on the maintenance of racetracks. Occasionally I do get to combine cars with roads, I'm speaking at a conference later this year on surfacing of race tracks whick combines work with hobbies so I'm not a total anorak.
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