Lake Berkley Topics: 28 days
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Name:
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Chevy4x4
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Subject:
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28 days
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Date:
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4/25/2007 9:21:32 PM
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It takes concrete 28 days to reach it's greatest strength. Although it does continue to get stronger over the years, but very slightly.
There are roughly 8 different types of cement that greatly influence concrete strength, with numerous other factors thrown into the mix. So yes, it does greatly depend on the quality of the concrete .
Rebar is used to give concrete useful tensile strength by overcoming compressive forces. IE: walls, beams, and cantalivers.
Most good finishing crews will put rebar into your driveways and sidewalks as it does resist cracking caused by curing shrinkage, thermal expansion, and contraction.
A general rule of thumb with concrete is: You can't stop cracking, but you can manipulate it. Expansion joints typically do the job if properly placed.
Also: on the rebar note: make sure you finishing crew uses some type of rebar basket and does not "toss and stomp down" bars into the concrete. The baskets are used to hold the rebar in the center of the concrete where it adds the most strength. Some people don't doe this, and you end up with rebar on the ground, and not in concrete...
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