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Concrete Curing Time

Old 07-29-2009, 02:34 PM
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Default Concrete Curing Time

I made a wooden form and poured a portable concrete base for a "beach umbrella". About 16" square and 5" high. How long should it set before I remove the form and how long until it's cured enough to move and use?
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Old 07-29-2009, 02:40 PM
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good luck with the project.

on question. you gonna transport this base with wheels? -or carry it?
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Old 07-29-2009, 02:41 PM
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You can take the forms off the next day you want to be sure it is set up good to use I think you will be good to go
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Old 07-29-2009, 02:48 PM
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Originally Posted by mcc113 View Post

you gonna transport this base with wheels? -or carry it?

That's 3/4 of a SF of concrete. Ron would have to Hulk out to carry that!

There are a lot of different mixes of concrete and mixing instructions have to do with curing, too. If an umbrella pole is stressed enough, it could wallow out the hole in the concrete unless you set a PVC pipe section into the mold and poured around it.
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Old 07-29-2009, 03:07 PM
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3-4 hours is all they waited for a drivway
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Old 07-29-2009, 03:28 PM
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Originally Posted by bamaboy473 View Post
That's 3/4 of a SF of concrete. Ron would have to Hulk out to carry that!

There are a lot of different mixes of concrete and mixing instructions have to do with curing, too. If an umbrella pole is stressed enough, it could wallow out the hole in the concrete unless you set a PVC pipe section into the mold and poured around it.
It's one 40 lb bag of concrete. I didn't measure the size I quoted above, just guessed.

There's a PVC pipe to hold the pole and once it's on the dock, I'll just have to slide it around a little as the sun moves. The umbrella blew into the water once already.

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Old 07-29-2009, 04:37 PM
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Concrete "curing time" is 28 days. It should be ready to use in a day or so. Be gentle the first few days.

Here's more info then you need.

http://answers.yahoo.com/question/in...8055023AAFyfMR
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Old 07-29-2009, 05:09 PM
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Originally Posted by 240 LTS View Post
Concrete "curing time" is 28 days. It should be ready to use in a day or so. Be gentle the first few days.

Here's more info then you need.

http://answers.yahoo.com/question/in...8055023AAFyfMR
Thanks. I poured it Tuesday and I won't move it until Saturday so I guess I'll be OK.

BTW: That link is just like THT. A dozen opinions, none the same.
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Old 07-29-2009, 05:35 PM
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If you keep it damp for the first few days it will cure harder. Concrete keeps getting harder for years then slowly goes soft all depending on the mix!
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Old 07-29-2009, 05:59 PM
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Originally Posted by ladyjane View Post
If you keep it damp for the first few days it will cure harder...........
I've been doing that.
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Old 07-29-2009, 06:39 PM
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16x16x2 might be the size of the pad with a 40# bag. If so, consider making another slab just like it, then place 4 bricks on the bottom slab and add the second slab to it; joining all with mortar. That will give you about 7" of height and 100# of weight. The danged pole will break before it tumbles.


Originally Posted by rwidman View Post
It's one 40 lb bag of concrete. I didn't measure the size I quoted above, just guessed.

There's a PVC pipe to hold the pole and once it's on the dock, I'll just have to slide it around a little as the sun moves. The umbrella blew into the water once already.
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Old 07-30-2009, 04:23 AM
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Originally Posted by bamaboy473 View Post
The danged pole will break before it tumbles.
Or it'll collapse the dock!
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Old 07-30-2009, 04:38 AM
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You can remove the forms after 24 hours, wait 7 days to cure before using, reaches 90% of its total strength in 30 days.
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Old 07-30-2009, 04:40 AM
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Originally Posted by tommyr904 View Post
3-4 hours is all they waited for a drivway
Not a good practice, hopefully you mean they removed the forms only and did not let people drive on it. When we pour driveways, it's a minimum of 7 days before anyone is allowed to drive on.
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Old 07-30-2009, 05:06 AM
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Originally Posted by bamaboy473 View Post
16x16x2 might be the size of the pad with a 40# bag. If so, consider making another slab just like it, then place 4 bricks on the bottom slab and add the second slab to it; joining all with mortar. That will give you about 7" of height and 100# of weight. The danged pole will break before it tumbles.
OK, I measured it. It's a little under 12" square (inside the form) and a little more than 4" high. I had a little more concrete than would fit the form so I sloped it up towards the PVC pipe.

Since it was a 40 lb bag of concrete, I'm guessing it weighs 40 lb. Any more and I would have hard time moving it. The umbrella is only up when we're around so if if gets windy enough to damage the pole I think we would take it down and go inside or home. More likely the umbrella top would come apart.
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Old 07-30-2009, 06:34 AM
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Personally I wouldn't remove the forms before at least 48 hours has passed, regardless of how the form was constructed. Did you nail or screw the forms together? Keep the new concrete wet for at least the first week to make it stronger. If you nailed your forms together and the outside of your square form has basically no protruding lengths/ corners of 2x4/ 6" to hammer on then I would leave the forms on for no less than a week.....I wouldn't want to see you blow out a corner or edge from the impact. Prying the form apart apposed the hammering would be better. Are you going to paint it afterwards?

Actually it would weigh more than 40 lbs, theres water in there.
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Old 07-30-2009, 06:52 AM
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Originally Posted by Garett View Post
Personally I wouldn't remove the forms before at least 48 hours has passed, regardless of how the form was constructed. Did you nail or screw the forms together? Keep the new concrete wet for at least the first week to make it stronger. If you nailed your forms together and the outside of your square form has basically no protruding lengths/ corners of 2x4/ 6" to hammer on then I would leave the forms on for no less than a week.....I wouldn't want to see you blow out a corner or edge from the impact. Prying the form apart apposed the hammering would be better. Are you going to paint it afterwards?

Actually it would weigh more than 40 lbs, theres water in there.
There's four pints of water. That doesn't weigh much.

The form is just a box made from scrap oriented strand board so I really don't have to remove it until it rots away. I thought about putting triangular blocks in the corners to soften the edges but once I got going I forgot all about it.

I doubt I'll paint it, it's on a dock, not a patio.
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