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Judgment & ambiguity · Decisions under uncertainty

Concrete cylinder break results at 28 days come back below the specified strength for a structural element that's already cast and partly loaded. The results are borderline and testing can be imperfect. What do you decide?

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Low breaks on cast, partly-loaded concrete are serious, but a borderline result is a reason to investigate the concrete's actual strength, not to immediately condemn or ignore it.

The full answer: structure, worked example, likely follow-up.

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