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What is the meaning of 28 day strength?

April 26, 2017strength

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What is the meaning of 28 day strength?

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The hydration process occurs rapidly at first and slows down as time goes by but hardens and strengthens as it hydrates. It would take several years to measure the ultimate strength of concrete, so for practical purposes, a time period of 28 days was selected as the age that all concrete should be tested. A substantial percentage of the hydration process has taken place at this age.