Concrete hardens and gains strength as it hydrates . THe hydration process continues over a long period of time , It happens rapidly at first and slows down as time goes by . To measure the ultimate strength of concrete would require a wait of several years . This would be impractical , so a time period of 28 days was selected by specification writing authorities as the age that all concrete should be tested . At this age , a substantial percentage of the hydration has taken place .
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