pouring concrete

in need of some thoughts on how to pour concrete and what to use for forms for a round ear corn bin. was thinking of doing it in two halves and going 6" thick. if I pour in one pour not sure how I would screed it off. the bin is 15" wide so was going to make the pad 17".
Gary
 
Various ways, I wouldn"t worry too much about making it exactly circular. And 17" diameter is not to much to finish by hand. But I would make sure it had a raised center, by an inch or so. I"d drive a few grade stakes in the center area, make sure it was raised, to keep water drained away.
 
When I erected a pioneer round crib many years ago the directions said to use one of the crib sections for a form which we did,and then used it on the wall as normal. It worked well, but left it discolored for a while, possibly because I was neglectful about cleaning it off soon enough. John
 
pipe in center 2x4 skreet (on edge) long bolt in one end of 2x4. piviot then you are only skreeting about 8 feet. I am assuming you meant feet not inches (' feet- inches ") place center pipe 3 or 4 inches high allowing any water to drain to sides. Any old bin sheets in your area? makes good forms.
 
correct I meant feet hit the wrong key I guess. I understand the idea of using the skreet board in that way, will that make a good enough "finish" without hand trowling or should I plan on hand finishing it?
 
After leveling the pour we made several rounds. Sometimes bouncing the 2x4 this left a slightly rippled finish but level. Then another pass as required. I never wanted a real smooth a floor as for ear corn and shoveling it could be very slick. Seems when using ear corn we always made feed on rainey days when nothing else could be done. Had one smooth floor and I busted my rear more than once shoveling the last of the crib when wet.Usually i keep the mix on the wet side,this made leveling much easier.
 
I didn't screed when I was pouring cement. Stretch a line tight and drive 3/8" rerod ever three feet to the line. Use a 4 foot aluminum float with a long handle. Float level to the top of the stakes and step the stakes over. A larger area you can use a transit to set the stakes. Most ready mix companys will furnish a float at no charge and bring it on the truck. At least they did 20 years ago.
 
If you have freezing temperatures you should finish it enough to close the pores, otherwise they might get water in them and pop out a piece of the surface. That is why sidewalks are troweled smooth and then broom finished.
 

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