The house I’m working on, my beach house, is on an island with a high water table. It is going to be lifted and new concrete block piers with footings put in to replace the concrete block piers without footings put in 125 years ago. I’ve opened up the floor to cut the non existent anchor bolts and see water under the house at times. Today I dug down about a foot and water started to fill the hole. So my question is, how can he go down 2 feet, pour a footing 2’x2′ by 10″, it cure, without water being a problem? He does this kind of work on the island all the time, I’m just curious as to how it’s done.
Kevin
Replies
How about pilings?
Chuck S
live, work, build, ...better with wood
pilings require the house be moved to the side and that is 50% more cost. Structural engineer said soil typ would support concrete block.
thanks
kevin
They pour concrete underwater all the time.
use cement mixed with dehydrated water...geezzzzz do I have to tell you everything???
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not cement.. it's dehydrated concrete...
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thanks
kevin
concrete doesn't get hard because it drys... it's a chemical reaction, what he does want to do is keep the salt and beach sand out of the mix... for small pours like each of your footings I've seen guys dig the hole... if water creeps in fine... they then use very thick large garbage bags and fill them with wet concrete in the hole letting them displace the water that has filled it.....
p
Pour at low tide?
dont' you know that CC cures best when kept wet?
seriously, often the CC will displace the water. I have jus been working on a form close the Fraser River here in BC we've hit all kinds of water with the low water table. we have to keep the pump running while we form. I wasn't there for the pour, but I imagine they pumped just before the pour, once poured no big deal, it set fine.