Crushed concrete for sub-base - Is crushed concrete fine enough as base?

[Garyp]

I have to take up the existing cracked concrete on my drive to excavate for the new block paving. I am planning to hire a concrete crusher so that I can re-use this material as (part of ) the sub-base. The question is: Will I need to add anything to the resulting crushed material so that it has a good mix of sizes, i.e. right down to the 'fines' and if so, what? Or will the crusher produce this range of sized material anyway?

[local patios and driveway]

ive not used a crusher, never looked in to its actual value compared to removing hardcore and bringing in pre-crushed concrete. i do know they kick up a fair bit of dust so i would expect to see plenty of fines and really these are key to using crushed, ask the company who are supplying the crusher, they will have the answer.
sorry i cant be of more help but saw no reply and something is better than nowt

[lutonlagerlout]

as long as the crusher is set 35>fines then you will be producing good type 1 material
dig dug dan could probably recommend someone in you area
j and d crusher hire
cheers LLL

[David 1234]

Hi - I used Dan's machine and it was awesome. I crushed an old concrete path which I first had to use a breaker on. The resulting crusher run was very similar to MOT - large bits were possibly marginally over the recommended limit - perhaps 50mm but there were plenty of fines. I have had a granite patio on this for a year and no problems.

I'd prefer crushing my own than buying crusher run as you know exactly what you've put into it.

[Garyp]

Thanks for the help lads, it sounds like the crusher will do what I want, and the web site link is particularly useful as it gives some examples of how long it takes to do it's stuff. I'll let you know how I get on. Gary