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Old 04-24-2012, 07:08 PM   #1
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Concrete curing time?

How long does it take for Cement to cure before you can start forming walls for a basement?


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Old 04-24-2012, 07:11 PM   #2
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I can't see your reply?????


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Old 04-24-2012, 07:41 PM   #3
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I don't understand your question. Usually your prepare the forms first, place the concrete, let it cure 24-48 hours, strip the forms. Concrete typically achieves about 50% strength in 3-7 days, and reaches design strength in 28 days. But perhaps this misses your question completely.
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Old 04-24-2012, 10:03 PM   #4
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It all depends on the "cement" (actually concrete) that is used for a foundation or strip footing to support a wall.

It is entirely possible to pour a strip footing (even at 0F) and place the first course or two of block for the wall on the same day if you have sophisticated or controlled placement and curing. the remainder of the basement walls will be done and ready for capping and enclosing the "basement" area in a couple more days.

If you are in the dark ages and think you need to have 28 day concrete wall strengths and then backfill before proceding, you are wasting time and money.

Concrete has a problem because it has to cured adequately before lateral loads are applied. Concrete block are essentially cured when laid and the initial strength of the mortar is really immaterial and does not prevent the construction of wall to support the vertical construction loads.

It all depends on the climate, the local materials and quality of the contractors.

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Old 04-25-2012, 06:37 PM   #5
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With the right concrete mix, admixtures, & temperature, it's not uncommon for the wall forms to be set the same day, although most folks set them the day after.

There's been a long term mis-conception that the footings should allowed to cure for upteen days before the walls are formed or poured on top. Complete BS. The weak-point in the entire assembly is almost always the ground that the footings rest on.

As for backfilling, most push it within a few days of the walls being poured here, but utilize efficient wall bracing like "Foot-lock" braces.......
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