Rejected concrete due to low Air-entrainment
Rejected concrete due to low Air-entrainment
(OP)
If a concrete slab does not meet the required air-entrainment, can the slab be rejected entiriely? In this case, the testor failed to reject the concrete at the time of the pour even though he identified the issue at the time of the pour. He is now asking that the entire slab be removed and replaced a day later? Any thoughts? Thanks in advance...





RE: Rejected concrete due to low Air-entrainment
Having said that, the testing agency should have advised the Contractor that the material was out of spec and that if not outright rejected and discarded that it may have to be removed; the testing agency should have to review this with the EOR and determine if the concrete was unsuitable unless he was given 'carte blanche' to have it discarded. Contractors often object to rejecting a load... for whatever reason.
Discarding depends on a couple of things (outside the contract)... if the material is unsuitable either from a strength or servicablilty requirement, it should go. It may depend on how far out of spec, but this should be a call by the EOR.
There's a lot less work getting rid of a load compared to removing hardened and finished concrete.
Dik
RE: Rejected concrete due to low Air-entrainment
"Should" the slab be rejected is another matter that probably depends on the freeze/thaw conditions in the locale, and the general level of the contractor's cooperativeness in complying with contract requirements and providing quality work. If freeze/thaw is not an issue, the benefits of air entrainment are economy and ease of placement for the concrete supplier and contractor - not the durability of the concrete. If that is the case, there is really no reason to reject the slab.
RE: Rejected concrete due to low Air-entrainment
Most contracts usually only stipulate the minimum material properties... strength, slump, air, etc. and leave the rejection to others...
Dik
RE: Rejected concrete due to low Air-entrainment
RE: Rejected concrete due to low Air-entrainment
I've not done much public work related stuff... but I've not seen this on commercial projects.
Dik
RE: Rejected concrete due to low Air-entrainment
Dik