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Why test the 28 day grout when 7day passed?

Why test the 28 day grout when 7day passed?

Why test the 28 day grout when 7day passed?

(OP)
Client ordered 3000 psi Grout. Project requires 2000 psi.  Contractor wants to know if we still have to break the 28 day break eventhough at 7 days exceeds the 2000 psi spec.

What are the unseen potentials with not breaking the 28 day grout samples?

RE: Why test the 28 day grout when 7day passed?

unless the testing company is offering a rebate, break'em.

28-days are considered the legitimate break and the 7-day is considered a diagnostic. Concrete breaks above the specified strength on the 7-day break almost a third of the time in my experience (and usually more so for grout), but the 28-day still gets broken and reported. Besides, if you buy 3000 you should get 3000.

i have heard tales of unstable concrete that gains strength and loses it because of a bad secondary reaction, but whether that can happen b/n 7 and 28-days i don't know.

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