2 posts / 0 new
Last post
Dan Winslow
Returning a slab

I removed a 5'x5'x4" slab of sidewalk, in one piece (still sore), to repair a water line. I now want to return the slab as it was. The slab was originally poured over 4 inches of pea gravel. The bottom of the slab is of course very uneven and pitted and uneven thickness: 3" to 5" thick in spots. I am not sure what to put down over the pea gravel to receive the old slab so as to get a good level fit. I have leveled the pea gravel down about 1.5 inches below where it was and planned to pour 1.5 inches of concrete then drop the slab back in place. I am concerned about:

1) Gravel or viscosity in the new concrete preventing the slab from settling down to grade.
- Should I use some type of grout instead of concrete.

2) Not being able to apply enough pressure to get the slab down into the fresh concrete to grade.
- Is there some type of vibrating device either beneath the slab or on it that will work the slab down to grade?

What ever advice you can offer I'd appreciate.

Re: Returning a slab

If it were me, I would form and pour a new slab. If you go the most expensive rout of using a product like Quikrete concrete mix it would only be about $50 for a new 5' X 5' X 4" slab and a lot less work. By the way you can go here to calculate how many bags you would need http://www.quikrete.com/Calculator/Main.asp#concrete

Sponsored Stories

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.