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Excessive Retardation of Concrete - any articles or papers?

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Ndtman

Civil/Environmental
Joined
Dec 30, 1999
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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) with double the recommended dose of Master Builders Pozzolith 300R. I am looking for any conference papers or journal articles describing similar experiences. Can anyone point me in the right direction?
 
Very less is available on this subject but personal experience has shown that lignosulphonate based admixtures behave this way when a phospho gypsum is used during cement grinding process. The concrete will regain its full strength at 28 days for sure.
 
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