Resurfacing Snake Pass

Originally Posted by Captain Nemo

its a 40mm wearing course inlay, and its SMA because thats all the HA use now, well thin surfacings anyway but they more or less spec everything else out.

shell grip on some of the tighter steeper sections,

but dont go thinking shell grip is the muts nuts...........

SMA ?? foreign language there mate !! did you pick that up in bulgaria ??

Explain yourself in english please

is it tar and chippings or tarmac LOL

Originally Posted by amarko5

SMA ?? foreign language there mate !! did you pick that up in bulgaria ??

Explain yourself in english please

is it tar and chippings or tarmac LOL

SMA = stone mastic asphalt - proper tarmac, these days. They're doing a proper resurface, as they'd already planed the old tarmac off when I went down it. No idea how far they've got now though, as I haven't been down since

[timwilky]

SMA = slippery as a slippy thing when freshly laid as it leaches out the oils and get covered in rain

[Binky]

Are they not resurfacing it to put some sort of speed control thing under the tarmac??? Apparently it can gauge the weight of what's traveling on it and judge the speeds while also realising if it's a bike, car, or truck etc.

Or is this utter rubbish???

Originally Posted by Binky

Are they not resurfacing it to put some sort of speed control thing under the tarmac??? Apparently it can gauge the weight of what's traveling on it and judge the speeds while also realising if it's a bike, car, or truck etc.

Or is this utter rubbish???

utter rubbish

sort of,

they put sensors under the road to count the axles that use the road, Roads are designed to take Xno MSA which is X no Millions of Standard axles, they use the flow and CV's (commerical vehicle %) to work out the depth of material reqd to give a quantifiable design life to the carriageway, knowing the flow on the route lets them predict future maintenance, they used to use cables accross the road connected to a logger at the side with a cassette in, now its all real time sent using a box with a sim card in, kind of stuff,
they can tell vehicle speeds from them but thats not what theyre for, and its difficult cos it counts the axle load and speed as it passes, it would need to know how manay axles each vehicle had to work it out properly, it can be done though, and i dont doubt it will be used for speed detection one day.

SMA is stone mastic asphalt , generall y the only surface we can use on trunk roads/motorways in England, Scotland can still use HRA hot rolled asphalt (traditional surface) under certain circumstances, and DBM dense bitumin mamcadam is used more now as well as sma in town as stuff as its easier and cheaper to lay,

contrary to popular (daily mail readers) opinion SMA is not slippy or cheaper , its more expensive to buy and its more difficult to lay, but if designed properly and laid properly it has longer life before further intervention is reqd , so whole life cost is lower, there is an issue with early life skid resistance being lower than spec, but not massively so, and it polishs up quite quickly, it just needs to be designed correctly and properly installed.

HRA isnt as popular a you need 2 gangs a paver gang and a chipper gang, so you need twice as many men and its a 2 stage process so if one stage isnt right it lets the other down, and you need more traffic management cos the chjippers need as much rom as the millenium falcon.

Surface dressing, where they roll a thin layer of tar and roll chippings into it, is a cheap way of sealing a surface to prevent further damage and to lift the skidding resistance and ride quality, its not a crappy way of doing things, its just how HRA roads are kept going, and it done right works really well, you get chips everwhere though.

this is what i do,

god its dull............................

[Binky]

Originally Posted by Captain Nemo

this is what i do,

god its dull............................

Yeah. I assumed it wasn't just a hobby.

You certainly know a lot.