Who knows about concrete?

My advise, depending on how long you want to stay where you are is always to do it really well, it’s a crap feeling when you cut corners on a job and it doesn’t stand the test of time then you have to demolish your work and do it all again hopefully you learn and do it properly this time.
Dig it out minimum 100mm, drill and pin into the existing concrete at 450mm centres half way through the profile to a depth of min 75mm with a 12 mm sds bit , hammer in some 12mm deformed bar cut to 200mm lengths tie to this some f72 fabric/mesh , order 1.6m3 of 25mpa, 12mm aggregate concrete from a concrete supplier at a slump of 80mm, find a Concretor or Concretor labourer to help you pour it, pay him $100 for a couple of hours work

I'd pull it up and poor a new slab instead of all the pinning and joins. But thats just me

From the days when I used to sweat for a living, I seem to recall that 1 cubic metre of concrete was around 25 builders wheelbarrow loads!
Makes a sheet of formply look real attractive

Am I doing my sums wrong...I thought 3m x .5m x 100mm would be .15 of a cubic metre? Only a few wheelbarrow loads??

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Originally Posted by Gordie

Am I doing my sums wrong...I thought 3m x .5m x 100mm would be .15 of a cubic metre? Only a few wheelbarrow loads??

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Yep

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Originally Posted by Vern

Yep

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Yes, the old 100mm trick appears again.
School boy error there[emoji849]
With that amount it would pay to use bag mix, although I would up the strength of it by putting in a bag of straight cement to every 4 bags of premix,

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Originally Posted by fitzy

....... then you have to demolish your work and do it all again hopefully you learn and do it properly this time......

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If a job's worth doing it's worth doing twice!?

On the pre-mix bags I used recently they had an estimate of the volume per bag.
Check the bags at your local hardware store!

Cheers for the advice fellas- you blokes really do know your concrete!
This is probably something I'll try to knock out on a weekend- I have a moderately steep and narrow driveway, with about 1 car length's worth of flat which is my designated wrenching zone! So I really need to maximise this part first before doing the whole lot. A professional finish is not super critical, Pretty much if it's flat it will work.

One option that might work in Tamworth (worked for me years ago in cairns)
Is do all the prep work
Call a few local concrete batch companies - small guys more amiable than boral etc
Often on jobs they will have .2 of a cube left in the truck
For a carton they will happily drop it in your hole rather than in their yard to dispose of later

Of course you’ll need to be “oncall” but if you can swing that you might end up with
Easy cheap grey stuff???

Steve