Concrete Pad Extension
Concrete Pad Extension
(OP)
We have two situations on our site...
1) 5' Wide Concrete Stormwater Trench that we need to extend 50'
2) 8" Concrete Slab that needs to be widened.
Each will need water stops placed, the concrete pad becasue it is in a chemical spill area.
In both cases would it be appropriate to sawcut each to a clean edge and then when extending to use dowels drilled into the existing end with adhesive instead of rebar? With a water stop needed does rebar give a better seal? My main issue is what is better to use, Dowels or Rebar in making a conection such as these. Just curious to hear peoples takes on this
Thanks
1) 5' Wide Concrete Stormwater Trench that we need to extend 50'
2) 8" Concrete Slab that needs to be widened.
Each will need water stops placed, the concrete pad becasue it is in a chemical spill area.
In both cases would it be appropriate to sawcut each to a clean edge and then when extending to use dowels drilled into the existing end with adhesive instead of rebar? With a water stop needed does rebar give a better seal? My main issue is what is better to use, Dowels or Rebar in making a conection such as these. Just curious to hear peoples takes on this
Thanks






RE: Concrete Pad Extension
In my mind, the main question is if the adhesive will react poorly with the chemicals. And, I would think the only way to know is to ask the manufacturer about it.
I've used adhesive anchors and such in heavy industrial projects a few times w/o any problems. However, I never did so for an area with direct exposure (like a sump or containment pit). So, I don't know that we looked at the chemical reactivity of the adhesives.
RE: Concrete Pad Extension
RE: Concrete Pad Extension
Just as you would a dowel cant you just drill into the existing concrete and insert the rebar with adhesive? I beleive the problem with using a dowel and a water stop together is that the dowel allows movement of the slab which you dont want with the waterstop.
RE: Concrete Pad Extension
However, when doweling one piece of concrete to another I often use the type of dowel recommended by the adhesive mfr. Usually they give load tests data for deformed bars and not smooth dowels. I don't know how you could recommend smooth dowels if you do not have any load tests on them.