08-19-2004, 09:24 PM
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Deity
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Join Date: Apr 2004
Location: Youngstown, Ohio USA.
Posts: 2,258
Thanks: 0
Thanked 14 Times in 14 Posts
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In the trade when they pour concrete they do a slump test to measure water content prior to the pour and often take a sample of each batch. The samples are allowed to harden 21 days before they do the compression tests. It was explained to me that concrete reaches 90% hardness in 21 days, then it takes over 100 years to reach the 100% hardness state.
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