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  1. Bernie

    Any experience with excessive retardation of concrete?

    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)...

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