Minimum number of days beween pours at joints in RC base slab

[kympen]

Can anyone give me guidance or point me in the right direction on the minimum number of days between pours at contraction joints in a 12" RC base slab. The joints have a water-bar as it is in a tank. If the forms are pulled the day after pouring, to reduce shrinkage cracking the specification says seven(7)days must be allowed before casting against the joint. I have looked through ACI 302.1R, 304, 304.2R and cannot find any guidelines relating to this time frame.

 

[BigH]

The trouble you will have, as I see it, is that even if a "reference", say ACI, says less than 7-days, your specification says 7 days and that would be the requirement.

 

[kympen]

BigH, Thanks for the response. We are trying to find a way to make up time as the project is behind schedule. We would like to meet with the owner to put a proposal for reducing this time constraint and need to put forward a convincing case.

 

[hokie66]

Follow the specification. The time requirement is there for a reason...quality of the final project. I am sick of contractors going behind my back to the owner to complain about requirements which are for the owner's benefit.

 

[RHTPE]

Amen Hokie66.

Pay now, or pay later. This fix later will not be easy nor inexpensive.


Ralph
Structures Consulting
Northeast USA

 

[sixaparrat]

I assume that you are already pouring the slabs in a hit and miss sequence, you should be able to get a pour every day assuming more than 8 bays

Cheers,
Chris