slab on slab
slab on slab
(OP)
I am looking for standards/specifications/recommendations/design guide for pouring a 4" concrete slab over an existing interior 4" concrete slab (foot traffic)...if one exists. Typically, we do not recommend or specify this, due to lack of knowledge of the existing slab and sub-base, however, a current client has specifically requested it, for financial reasons. Therefore, before I discount this option, I am wondering if there is any protocol that can be followed for successfully pouring a slab over a slab...with the confidence that the end product will perform. I have not been able to locate any information with ACI. Does a guide/protocol exist? If not, what are your thoughts/recommendations? I can provide more specific project information, if necessary. Thank you.
RE: slab on slab
RE: slab on slab
RE: slab on slab
If it is just to have a nice new concrete floor and the old slab seems to be in generally good working order than I don't see why you can't just through the new slab on top of the old one.
RE: slab on slab
I am not able to locate any standards for "slab on slab" construction, if any exist. Should the new slab be independent from the existing slab?...slip sheet between....or
Should the new slab be bonded to the existing slab?...bonding agent and/or reinforcement ties.
RE: slab on slab
I am speaking from personal experience. One of my jobs in New Zealand was nearly ruined by construction equipment causing a later rebound. This was likely due to an insufficiently compacted base under the existing slab. There is no way to ensure the quality of the new slab when you blindly place over old.
I have been told that the same preparation normally used for adding loads to an exising slab (ie: low pressure grout injection) works, but with no way to do any quality control worth a damn.
RE: slab on slab
RE: slab on slab
RE: slab on slab