Expansion joint in 2'-8" foundation slab?
Expansion joint in 2'-8" foundation slab?
(OP)
I am working on a project with a pump station and water tanks sitting below grade. Due to buoyancy, I need 2'-8" thick base slab. Due to length of structures, I need 1 inch expansion joint in this slab. I will use PVC waterstop.
I just can not find any ideas or info on how to leave this 1 inch open under the waterstop. If I use any filler, it will be smashed by the concrete during pour.
Any ideas?
I just can not find any ideas or info on how to leave this 1 inch open under the waterstop. If I use any filler, it will be smashed by the concrete during pour.
Any ideas?






RE: Expansion joint in 2'-8" foundation slab?
RE: Expansion joint in 2'-8" foundation slab?
RE: Expansion joint in 2'-8" foundation slab?
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora.
RE: Expansion joint in 2'-8" foundation slab?
Thanks.
RE: Expansion joint in 2'-8" foundation slab?
You want to make sure that stuff doesn't get in the joint and restrict the movement. Hence the backer rod and caulk. If the void forms you're talking about are the same I'm familiar with, they'll deteriorate and you'll be left with an open gap. This will quickly foul with grit and dirt and stop the joint from closing.
See ACI 224.3R Chapter 9 for some examples.
RE: Expansion joint in 2'-8" foundation slab?