Granite top for hammer circles - Granolithic concrete

[Hammercoach]

The athletics event of hammer throwing requires a top surface to the throwing circle to be grippy but not gritty, smooth and not slippery in the wet.
It also needs to be high impact resistant to absorb being wolloped by heavy steel balls
It has been found that granolithic concrete mix is the most suitable for the surface. There has never been a prescribed mix and I am seeking your advise on this subject - This mix will become the prescribed mix for future throwing venues in the UK
It is proposed to use 3 (3mm - dust granite chips), 2 (sharp sand) and 1.5 (portland cement).
The top granite coat will be 30 -40mm thick and polished off to a glass finish. This glaze will be removed using concrete cleaning acid until the desired level of grip is achieved.
Does the granolithic mix look suitable for the chosen use?

Dave

[Tony McC]

Mmm. I think that's actually a bit cement-rich and that you'd be better off using a bond and strength additive such as Ronafix or SBR. I'd be looking for summat nearer to 5 parts grano to 1 part coarse sand to 2 parts cement, but I'd want to trial a few mixes before committing myself.

[simeonronacrete]

Go to the Ronacrete web site and have a look at

documents
flooring
cementitious
Ronafix

See our mix design B for granite screeds.


Regards