Thanks for the response Ron, but that is exactly my point. The engineer on the project rejected the shafts based on the early UPV data. My contention is that retesting showed improvement, and the likelihood is that the material would have ended up with more than adequate strength. I have...
I am trying to help a client who has had a problem with excessive retardation of concrete in drilled shafts (piles).
When tested by sonic logging at 7 days some of the concrete had low UPV. When retested at 14 days UPV had increased by 50 percent. The mix was self-consolidating (9 inch slump)...
