Crushed concrete as road material

[dogsdangly]

Hi

We have a long concrete track that is severly potholed in large sections. Cant afford to tarmac it (pointless anyway because cracks will eventually come thru tarmac) or to re concrete it from scratch so I am thinking of getting it crushed - either in situ using a Kirpy crusher (see http://www.roadreclamation.co.uk/) or by simply digging it up - feeding it through a normal crusher and putting it back. Obviously it will need shaping and rolling to get a good camber and compaction.

The kirpy crusher method also could have cement powder added and mixed through the agregate to make a more durable finish.

Any thoughts? My main doubt is that crushed concrete might not make a good base material - not that I have anything to support that fear. We could add more stone to the mix but I am desparate to keep costs down.

There isnt much traffic on the road these days - just a few cars and no tractors.

Cheers
DD

[GB_Groundworks]

if its clean concrete and can be pulled up and loaded cleanly then it will be fine, but will pothole alot quicker then before as there is nothing to bind it together only compaction and water will quickly form pot holes again with regular use.

with the road crushers like the meri type im not sure you can use them on big slabs of concrete, they work great on asphalt etc tracks with a bit of concrete but if its a huge concrete road i doub they will do it. the machine wear would be not costeffective to grind the concrete down. adding the cement etc as per stabisilation would be good but id get a price if i were you think you are going to get a shock....

lifting and crushing and relaying might be your best option, or lifting crushing remixing relaying but its going to be 100% expensive than just laying it as mot



Edited By GB_Groundworks on 1319214035

[lutonlagerlout]

if you crushed it and even laid road kerbs it would be not half bad
no lateral restraint equals a fail down the line
LLL

[Pablo]

Cruched concrete would need to be blinded with type 1 because it would be a rubbish running surface. How big are the damaged sections and how long is the track. Sectional patches of Tarmac or new concrete would probably be cheaper you get good discounts on the stuff if you phone around with a large order.

[dogsdangly]

Hi All

Thanks for the coments.

If we were going to do this the "Kirpy method" it would involve breaking up the slabs with a pecker or hammer before going over them with the crusher.

The companies I ve asked about this seem to think that if it is stabalised with cement you get a good solid surface although it is prone to some cracking. An engineer friend suggested that this might be due to the fact that crushing concrete often exposes cement that hasnt fully cured (apparently crushed concrete can bind itself together becouse of this) and that the end result might be a stronger mix than intended - hence the cracking. Not sure about this but there does seem to be some logic to the theory and my attempts to google this have thrown up some research that supports the idea of concrete "resetting".

The road in question is 800 m but the worst damage is in three sections - 200m , 140m and 75 m (all 3m wide).

One thing I am fairly certain of is that my neighbours suggestion that we fill the holes with quarry dust (it will bind to itself cos its got lime in it - so he says) is mistaken. I reckon it will just wash out of the holes within a few months.

Im looking at the mot option. The one thing we have is plenty of rock - its just the cost of getting it there and getting it crushed to the right size.

I get some prices in the next week or so Ill let you know. Any coments would be very useful.

Cheers

DD



In terms o

[WilliamEthen]

I am very much agree with the pablo, Cruched concrete would need to be blinded with type 1 because it would be a rubbish running surface. How big are the damaged sections and how long is the track.