I think I may have a huge problem. I am putting in a culvert pipe. It is a 24" pipe. I wanted to make straight end walls like most of my neighbors have so my house will look a little nicer.
The DOT for florida wants a 11 foot long 24 inch wide and 16" deep footer for the end wall to be placed on. So I dug every thing out and basically I have mud. The water table is high here. Some times even in the winter. You can see to water flowing from the ground. its actually coming out from above the footer forms so over night the whole thing fills with water.
I can pump the water out long enough to pour concrete but the footer will be resting on mud and I'm sure it will sink some.
You could dig a little more out and put some rock down there for drainage, then extend one end with rock beyond where the form is so you can put a sump pit in (5 gallon bucket with holes in it or whatever you have laying around) and have the sump pump in there until the concrete has time to cure.
Portland cement is a hydraulic cement which means that it sets and hardens due to a chemical reaction with water. Consequently, it will harden under water.
Build your forms and pour your concrete. Just make sure they are well staked down to withstand the lateral pressure, and so they don't float away. :hide:
your suggestion reminds me of something I saw on the history channel about Wood and all its uses.
In some area of the country where they have to build almost everything on mud they drive the 40 foot long wooden piles into the ground and pour the foundation over that.
Thats kinda like your suggestion.
Though I think solved the problem another way.
It was the silt that was washing into the footer forms that was so soft. when i stepped in I would sink down right away. So I took a bunch of scrap plywood
and drove cut pieces into the ground outside the forms. This kept the silt from flowing under the forms. Once I did that and dug it out again and everything settled it felt pretty firm.
firm enough I hope. I still may drive the rebar down. I'll see what its like next time I pump the water out.
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