Concrete shuttering should be used for how long?

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Concrete shuttering should be used for how long?

Postby steady » Mon Jan 28, 2008 9:18 pm

What is the minimum length of time wooden shuttering should be left around concrete pilars or footings during the build process? Assuming that water is sprayed onto the concrete to ensure that no excessive drying out occurs. The background is that a builder has been fired and removed his wood quick time, i.e. after 4 days on 35mm x 35 mm footings.
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Re: Concrete shuttering should be used for how long?

Postby jazzman » Tue Jul 01, 2008 9:44 pm

Don't know how this got missed and received no repplies but for anyone joining the thread now, here is the answer:

Four days is ok, but nothing should be put under load for a couple more days. It is important to keep structural concrete damp for a week or so to prevent the water drying out before it is absorbed by the curing process. This can be done by covering it with hessian or rice sacks and spraying it with water.

You will often see concrete columns wrapped in PVC sheeting after the formwork has been removed. This also prevents the water from evaporating.
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Re: Concrete shuttering should be used for how long?

Postby AussieBoy » Fri Aug 08, 2008 5:30 pm

This will help those in the future, we strip boxing / shuttering on ground slabs the next day, its strong enough to start work on, for vertical columns it usually left 7 days before striping, and 28 days before loading columns
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