Concrete Slab on Grade Adjacent Pours
Concrete Slab on Grade Adjacent Pours
(OP)
I have a large industrial floor that is being poured with several different pours. I have asked for 7 days minimum between adjacent pours. Contractor wants to cut this to 3 days.
Slab will be in an unconditioned warehouse type building [some heat in the winter].
So slab is subject to temperature changes from summer to winter.
We are trying to keep the construction joints tight, knowing that they will be moving with the temperature changes.
What amount of time would you consider?
Slab will be in an unconditioned warehouse type building [some heat in the winter].
So slab is subject to temperature changes from summer to winter.
We are trying to keep the construction joints tight, knowing that they will be moving with the temperature changes.
What amount of time would you consider?






RE: Concrete Slab on Grade Adjacent Pours
RE: Concrete Slab on Grade Adjacent Pours
RE: Concrete Slab on Grade Adjacent Pours
You are all bringing up issues that we talk about every time we have one of these projects.
Generally, we find that there are too many variables to come up with the absolute correct solution.
Time of year of pour
conditioned or un-conditioned building
rack locations
equipment traffic
docks
bollards
pallet storage
special racking - wire guided pick modules
mezzanine columns that are off of the main column lines
storm pipes from the roof adjacent to columns
flat work sub contractor experience
mix design
sub-grade
base course
I could go on.
RE: Concrete Slab on Grade Adjacent Pours
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Concrete Slab on Grade Adjacent Pours
All those issues are leading to the attractiveness of "jointless" floors. Warehouses (and big box retail) where I am are being built with joints at about 30 metre centres. I haven't been personally involved in any of these projects, but know they use low shrinkage mixes, and steel fibres. I think that eventually, standards for routine use will be developed which eliminate many of the joints, as joints are the biggest problem in warehouses.
RE: Concrete Slab on Grade Adjacent Pours
The floor is being poured checkerboard and staggered.
This is for the most part keeping adjacent pours 7 days apart.
There are going to be some later on that will be 3-4 days apart
GC's schedule is pushing the faster pours.
Hokie66
I don't disagree that joints are always an issue.
We have looked into shrinkage compensating cement mixes.
We have looked into fiber reinforcing.
We always spread joints out as far as possible.
SC cement has a large upfront cost.
Spreading joints apart as far as possible is always a priority with warehouse floors.
There are always things that get in the way of this; mezzanine columns, mechanical pipes, bollards.
thanks for all the replies
RE: Concrete Slab on Grade Adjacent Pours
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.