Assisted Slump Test
Assisted Slump Test
(OP)
We have a situation where a concrete supplier brought their own QC onsite to test a recent slab. It was observed by us that the concrete finishing sub aided in the actual slump test with the QC tech from the supplier. The concrete finisher actually was the one who placed the concrete in the cone while the QC rodded the sample. While the placement of 3 equal layers and number of roddings wasn't acceptable, a comment was made by the QC tech that it was "common practice" for the concrete finisher to aid in a slump test. I have never had any help from a sub nor would I have asked. I can not ever recall this being mentioned in any of my ACI classes either. I was just curious if this is a "common practice"





RE: Assisted Slump Test
RE: Assisted Slump Test
Thanks for the comment.
RE: Assisted Slump Test
RE: Assisted Slump Test
RE: Assisted Slump Test
BigH suggest that in this situation the inspector "should...go up and dump the cone upside-down and get them to do it right." While no one enjoys giving a contractor bad news more than myself, I would avoid this sort of in-your-face confrontation. The person(s) performing the tests should simply be notified that the test proceedure(s) do not meet the standard, that the results derived are completely erroneous, and that the facts of the matter will be delineated in a report to the owner or the other powers that be.
If any of the following documents were in the specs I'd say you have argument as these two clowns were obviously NOT qualified.
ACI-301
1.6.2 – Field tests of concrete required in 1.6.3 and 1.6.4 shall be made by an ACI Concrete Field Testing Technician Grade 1 in accordance with ACI CP1 or equivalent.
ASTM C-94
16.2 – Tests of concrete required to determine compliance with this specification shall be made by a certified ACI Concrete Field Testing Technician, Grade I or equivalent.
ACI-318
5.6.1 — Concrete shall be tested in accordance with the requirements of 5.6.2 through 5.6.5. Qualified field testing technicians shall perform tests on fresh concrete at the job site, prepare specimens required for curing under field conditions, prepare specimens required for testing in the laboratory, and record the temperature of the fresh concrete when preparing specimens for strength tests. Qualified laboratory technicians shall perform all required laboratory tests.
RE: Assisted Slump Test