concrete help

[powerboatr]

I have a large slab 26 x40 and for some reason the stevie wonder person that "leveled" it when it was poured last year, was ....well BLIND or on drugs.

so now when it rains i get large puddles in the middle that have to be squeegied (sp) off
so would it be best to cut grooves to allow the water to drain off
or have it ground to remove the higher outer edges???
its 8 inches thick so i thought a few strategic grooves 3/4" wide would allow the water to run away??
any thoughts or
thanks

 

[atk]

thats what i would do. get a gas powered cut off saw with a cement blade and cut away, but make sure to wear safety glasses and dust mask.-popcorn

 

[dpantazis]

robert-

the finisher propably did it right when he troweled the surface.

what is happening is that the slab is curling due to drying and shrinking.

most importantly, what is the slab's thickness? is ti 8 at the edges and 6 in the middle? do you have crack control joints at regular intervals? what spacing?

post the info up and i can check them if they might be an issue.

if you sawcut any joints, they will act as control joints, crack and water will migrate down and cause the reinforcing to corrode.

how deep is the puddle in the middle? how far across? i am trying to get the slope estimated.

dp

 

[powerboatr]

dennis
puddle gets to be about 8 feet in diameter with one end closer to 12
slab is 8" on the edges and from some evidence the middle is close to5 or 6"
the puddle will setle 3 feet from teh edge and of course it all puddles under the rv and with the slide out it encompasses almost all of the slide covered area.....
i had thought go 1/2" down starting at zero at the puddle and end up 1/2 at the edge
thanks

its not off much, but enough to create a large body of water 1/2 to 3/4 deep in the lowest edge

 

[no-red 6 0]

Robert-
I got some experience in this. A combination of all of the above are true.
Using a diamond blade concrete saw would do the trick. Just use precautions. Is their expansion joints already? You would benefit from doing the cut at a sloped cut to let water drain. Just crank down on the dial a little as you go. I WOULD not recommend doing the surface grinding. What happens then is no longer a nice looking top. You will grind away the mud (top) surface and expose the aggregate. It will no longer look nice. Maybe post a pic. Shoot a hose on it to create a puddle so we can see?

 

[atk]

had a thought, might not be a good one....what if you would drill 3-4 half inch holes so the water would drain down. you might have to clean holes out once in awhile. not sure if it is a high traffic area, you might beable to make up a small grate to cover holes and keep bigger objects out of holes.... ....

 

[powerboatr]

atk
small holes i think would undermind the slab integrity over time ...
heres a few pics

 

[jharvey]

Robert, just keep squeegeeing (lot's of eeeeee's LOL)....it's good exercise for you

 

[powerboatr]

Robert, just keep squeegeeing (lot's of eeeeee's LOL)....it's good exercise for you

wifes getting real tired of doing the squeeeege thing
-popcorn

 

[Tail_Gunner]

How hard would it be to just put a floor drain in right where the middle of the puddle is?

You could go under the slab from the nearest side maybe 2'-3' down and just put some ABS or PVC from the drain to the outside into a covered sump well.