Concrete mix suitable for continuous immersion in water

[Donwill]

I am about to cast a hollow concrete plinth on which a fountain will sit. The outer mould will be a galvanised steel ring 10 inches high by 24 inches diameter the inner mould being a plastic bucket, the space within the plinth will house a pump to drive the fountain. . I don't intend to keep fish or plants in the pool so I'm not bothered about the toxicity of the water. The plinth will, when cured, be totally immersed in water, and I wondered if there was a special mix or additive I should use to protect it from long term immersion. What does the team think? Regards Don

[The Natural Philosopher]

The only two issues are porosity, which is solved by adding plenty of cement and possibly a little PVA or other special filler, and frost damage, which is solved by making it non porous :-)

Did you know that boats have been made out of concrete?

[meow2222]

Concrete loves water, but not frost. Using 3:1 mix will give you minimum porosity and max frost resistance.

NT

[Rick]

Look at the "skia" products which let you increase the % of cenent, and therfore the waterproofness.

Sika-1, lets you accheive a 1:1 mix for waterproofing walls.

Rick

[Peter Ashby]

When I was younger in Southern NZ chap at the end of our road built a concrete yacht. Took him ages. Great fascination though when the crane arrived to lift it over his house and onto the truck.

Peter

[Andy Hall]

Was he thought of as being a bit of a kiwi fruit? :-)

[Peter Ashby]

Back then they were still known as Chinese gooseberries, we had a vine against the back of the garage. IIRC rebranding started around then or just after.

Peter

[The Medway Handyman]

Sometimes your jokes realy haka me off..............

[Donwill]

Manyt thanks for your replies.

Cheers Don