The Brew Cabin

Posted: **Fri Aug 01, 2014 10:29 am**

Hi,

I have had a stone covered driveway that I have removed the stones from to find half is concrete and half is type 1. Its all very stable as its had cars parked on it for years.

I want to lay a gravel bonded driveway but need a suitable base for this to be laid on.

I know that I can pour new concrete over the existing concrete with a 1 inch layer but am unsure about the MOT. The layer of the MOT is about 1 inch below the concrete slab.

The area of the driveway is 9 x 9 (so 81m2)

I have seen a way of putting resin bonded over this mix of layers and this is an example:

Sure set

However I am considering a concrete pour over the whole area so it will be 1 inch over the concrete and 2 inches over the type1 and intend to use a steel fiber re-inforced 100N/m concrete formulation (UHPC). Given this is 5x the strength of a standard driveway concrete that is normally only laid at 5 inches thick and given the sublayer is so mature AND given that there will be a topcoat of a resin bonded gravel I would have thought this would be more than acceptable.

BUT obviously I'm on here to ask if there is something I am missing?

Posted: **Fri Aug 01, 2014 5:50 pm**

an inch of concrete?

you are winding us up

best base for RBG is bitmac

no driveway concrete should be less than 100mm and no bay greater than 3m at that puny depth

sorry but your plan is doomed to failure

plus I think you will find the sure sett is blooming expensive

LLL

Posted: **Sun Aug 03, 2014 12:06 pm**

Sureset are the market leaders in this area, not cheap but what you get lasts (and is UV stabilised unlike many others.....)

Posted: **Wed Aug 06, 2014 11:57 am**

Ok well that answers that question! I guess I have a lot of digging ahead of me

Oh and it was 2 inches or 50mm, only the pour over on existing concrete to bring it up to level was going to be 25mm (Which I have read elsewhere on this site is acceptable even with a 20N concrete, so should be way over the top with a 100N?

So new question, what would be the benefit of a 100N concrete over a 20N concrete if it doesn't allow me to reduce the depth of the base? Thanks!

Posted: **Wed Aug 06, 2014 8:13 pm**

Who is going to lay the 25mm thickness of steef fibre reinforced UHPC concrete (which I presume refers to ultra-high performance concrete)? The general rule is that the minimum thickness of concrete should not be less than 4 times the maximum size of aggregate - so for 20mm aggregate the minimum thickness is say 75mm. What type/size of steel fibres are they? Have you consulted the supplier about your intentions?

Posted: **Mon Aug 11, 2014 12:51 pm**

We are distributors of Ronacrete and they do a UV stable resin bound - RonaDeck Resin Bound.

Please contact Ronacrete or us if you're interested.

The Brew Cabin

Concrete driveway - Advice please!