Ok to submerge cured concrete?
 

A couple weeks ago I made some umbrella holders just using a couple plastic planter pots and PVC pipe sticking out, then poured concrete around for weight. It dawned on me today that I dont think there is any reason I can put it on the steps for some in pool shade, but I thought I should check and see.

Everything I google keeps coming up with ways to pour concrete in water or how to set in wet environment, I'm talking about fully cured concrete.

Any issues?:confused:

Shouldn't be any issue.

Don't do it. It will suck up water like a sponge and start to float.

piers, docks and bridges seem to work ok

If you can put wet concrete in water and it will cure (Roman's discovered/invented this, right?), then you can certainly use already cured concrete in water. I guess the only downside might be if the water had a pH of 2...

Depending on what/how you treat your pool water it will either be just fine or it will cause a nuclear zombie spoclypse.

Go for it.

The guys setting my hurricane metal fence posts in concrete told me that concrete will set under water. I see no problem.

My neigbors new house had the basement poured on Tuesday morning as I was leaving for work (6:00 A.M.) it was a truly hot/humid day (95 degree, 90% humidity) that boiled up some storms in the afternoon. We ended up getting 5.5" of rain in a 3 hour period, which overflowed our creek, and the ditches, so we had water flowing 6" deep across the road in front of our house. I wasn't able to stop and look, but I wonder what happened to his newly poured basement.

If there is rebar or other untreated metal in it, the chlorine will cause it to rust. Eventually it will expand and pop the concrete. Look up spalling.

If you want it to last, get a bag of pool plaster and coat it.

Otherwise go for it.

The mob uses it to hide evidence and it seems to work well for them. It should work well for your application.

The only concern I would have is the possibility of damaging the surface of the pool.
If the wind picks up a bit and starts to move and rock the weights it could get expensive fast.

If it was up to me I'd find a way to anchor the umbrellas outside of the pool.
You could get one with an articulated arm that swings over the pool.

http://forums.pelicanparts.com/uploa...1497880065.jpg

You're over thinking it. If it degrades after a couple summers make another one. Your into it for less than $10.00

yeah, a bag of Ready Mix is three dollars and weighs 70 lbs, you can make a lot of weights with that. swimming pools are made of concrete and they have steel in them. it seems to work

Costco:
Articulated, adjustable, big.
Close it prior to heavy winds or it may end up in your pool. :eek:
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http://forums.pelicanparts.com/uploa...1497884819.jpg
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http://forums.pelicanparts.com/uploa...1497884846.jpg
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Costco umbrella base resting sweetly in 8 ft. of water.
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http://forums.pelicanparts.com/uploa...1497885221.jpg

I remember that thread Don.

That was something. The entire rig in the pool.
With goggles, I went down, unscrewed that center piece, removed the lid to expose the sand tub, extended the hose on my shop vac, sucked the sand up (took an hour or so), and eventually was able to lighten it to the point of going back down an lifting it to the shallow end.
Never again !!! (I hope) ;)