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James, assume the surface is already concrete ? We've done the odd job like this before and would question if 2-3" of normal concrete is sufficient depth and will bond to existing substrate. If it's a short term repair with no guarantees, it may work
We ended up doing similar with quick setting Instarmac stuff and also an epoxy based product. Can't remember who we got it from but it was expensive but still in pace.
it appears to be 1/2 inches of tarmac with stone rolled into the top. but under that the base just appears to be large stones? almost like decorative stuff. I did wonder of I should just take out to 6" below surface, type 1 3" then high strength concrete 3" as its only car traffic in a small residential car park.
Have a look at i-fix (one of LJN's advertisers) http://www.i-fix.co.uk/
They do repair kits for drives etc.
might be good for smaller holes, but some are rather wide and 50mm deep. i.e. 1m by 1.5m oval shape between 0-50mm deep
so probably quite expensive. Where as a premix concrete is £6-7 for 25kg. Can put matts down over it whilst drying to
if its tarmac your better off removing all loose material then cutting all edges straight and fill in with a tarmac repair product and compact in with a compator plate use a water can to sprinkle water over before compacting as it will stick like mad to the plate.
this should last out a year no problem.
the thing with carparks is you think its only small vehicals using them but there is at times bigger vehicals like 4x4's and vans which will compress any concrete repair crumbling it up in no time
If its just until next year I would patch up with a strong mix but smaller aggregate. I might be tempted to use some SBR depending on the conditions.
An old farmer I once worked for used to sprinkle some neat cement on top of his new concrete patches in the farmyard, and I remember at the time being surprised at how quick the hard wearing replacement surface cured. Needless to say there were farm vehicles using that area.
Perhaps you could experiment in 1 or 2 places before taking on the whole car park?
i'd think twice before using concrete if the carpark is flat, as when gritsalt gets on green concrete in the winter, it will erode it in no time if it puddles over the repaired areas. i'd cut each area neat with a stihl saw, dig out to 6", infill with 4" mot and plate it down then finish with tarmac.
Ben I think you may have got it! At least type 1 is cheap and coldlay is only £6.50 per 25kg bag so not to bad!! probably 15/20 bags of mac and might just get a bulk bag of type 1