Best concrete mix for worktop

1 Apr 2014
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United Kingdom
Hi folks, I'm going to be making a concrete worktop. I'm happy I've researched enough on the technique side but can't find much about the mix. I've had a chat with the technical guy at blue circle who was extremely helpful and suggested a 1-2-3 mix cement-sand-aggregate and suggested fine aggregate, around 1cm, and plasticiser, then vibrating the cr@p out of it. I shall do this with a hammer drill, a rounded-off bit and a steel plate from underneath the mold. I'm also going to be using steel reinforcing mesh and some rebar in the thin bits like around the sink.

One thing I'm not sure on - should I be using sharp or builder's sand? I've heard builder's sand may be slightly impure (may contain clay?) and thus the finished piece might not be as strong. However I've also read somewhere that cement using builders sand may 'flow' better, avoiding voids, and may help eliminate cracking. Any thoughts?

I did even wonder if a 1-1-1-3 mix might be worth trying -
1 part cement
1 part builders sand (or even plasterers sand maybe?)
1 part sharp sand
3 parts 10mm aggregate

I was thinking this might give a compromise between flowing and avoiding voids, and final part strength?
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I've looked at this online (you tube) very interesting, here's the guy who's accredited with the start of this -‎, or at least tutorial courses accredited to him. Ones a 1 day online course!...pinenot :)

I saw this before during my web trawling, looks very interesting! Unfortunately the cost of the tutorials are about my total cost for the project... ;)
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All interesting stuff, thanks. The youtube video you posted seemed to be more of a concrete-covered worktop though. This is the 'real thing' though the guy presenting it seems to be a nut...

Still can't find anything on sharp/builders/plaster sand though. Might be worth another call to blue circle I think!
All artisans have an eccentric nuttiness about them. Have watched that clip about 10 times.
this you've got to see -[/QUOTE]
Good grief :eek:

Her way:




Other ways:









Yeah its something like the finish on a garage floor she achieved.
Though I bet she is dead proud of it. :LOL:
I wonder how long before water gets under it through these gaps and wrecks it?


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