Concrete

[1949 caddyman]

There putting in fiber optic in our neighborhood. Some of the concrete driveway approaches were damaged & were replaced today. They told our neighbors that they could drive on it tomorrow.
That seems too soon to me but I am no expert on it.

Can you drive on 1 day old concrete?

 

[NUTTSGT]

You can. . . . but you shouldn't. I wouldn't.

 

[PCustoms]

Depends on a lot of things.

What size, what mix and what is the expected traffic?

 

[Hobby_Man22]

It takes 28 days to get to design strength. They're usually walking on it a couple hours after pouring to brush it. I wouldn't drive a vehicle on it after a day. I bet you would leave tire marks after only a day

 

[bluedog225]

I’d wait a week and keep it wet.

 

[txvwnut]

It’s probably a rapid set or has a curing agent in it. At the day job we use a rapid set that after an hour you can run a 747 over it.

 

[Hobby_Man22]

I’d wait a week and keep it wet.

reminds me when my slab was poured. I was out there twice a day with 400ft of water hose connected together to reach.

 

[wssix99]

No big deal for a small area, particularly if its the City's concrete. (not yours) https://renovated.com/concrete-curing-time-chart/

The concrete will reach 15% of its 3000+ psi compressive strength in 24 hours. (So, 450 psi.) The pressure your car will put on the concrete will be around 30-40 psi.

That being said, at 450 psi, the concrete will be weak against dynamic loads. So, if you want to treat it kindly you can:
- Drive slowly over it for the first week (until it gets to 50% strength)
- Don't slam on the brakes or anything like that on the new concrete
- Avoid heavy vehicles and machinery
- No kids on pogo sticks

(The above article and many others will recommend waiting 7 days until the 50% strength point, but I don't think that intends for things like entire driveways. Something like a sidewalk ramp should be fine if you are careful.)

 

[1949 caddyman]

Thanks, they gave no spechs of the mix. Will report back later on results.

 

[1949 caddyman]

Cars & pick up trucks are driving over it, looks ok.

 

[JohnX14]

How much approach was replaced? 5' give or take? I wouldn't drive on a one day old driveway. But to drive over the street approach is a bit different....

 

[Fixr]

How much approach was replaced? 5' give or take? I wouldn't drive on a one day old driveway. But to drive over the street approach is a bit different....

Fiber optic? I'd expect something on the order of 6-18 inches. But it depends on who made the trenches.

 

[oldwino]

No big deal for a small area, particularly if its the City's concrete. (not yours) https://renovated.com/concrete-curing-time-chart/

The concrete will reach 15% of its 3000+ psi compressive strength in 24 hours. (So, 450 psi.) The pressure your car will put on the concrete will be around 30-40 psi.

That being said, at 450 psi, the concrete will be weak against dynamic loads. So, if you want to treat it kindly you can:
- Drive slowly over it for the first week (until it gets to 50% strength)
- Don't slam on the brakes or anything like that on the new concrete
- Avoid heavy vehicles and machinery
- No kids on pogo sticks

(The above article and many others will recommend waiting 7 days until the 50% strength point, but I don't think that intends for things like entire driveways. Something like a sidewalk ramp should be fine if you are careful.)

Thanks, you beat me to this

 

[dura eagle]

Throw some 2x12” down and spread out the weight a little might help.

 

[PCustoms]

Throw some 2x12” down and spread out the weight a little might help.

It's been 3-4 days, I'm sure it's cured by now...

 

[1949 caddyman]

Here is a pic of the concrete, no cracks.