Drying time for coarse concrete?

[zzelma]

Hi! I am working on a 9 sqm roof over a dog kennel.
The roof will stand on 3 posts on the slightly lower side and 2 posts on the slightly higher side.
I have managed to dig out for foundations for all posts except in one corner on the lower side. I have to cast there.
My question is; how long after I have cast this foundation do I have to wait before 1. Setting up posts with a beam 2. Laying roof battens and metal roof?

 

[huggan]

Hello! I'm working on a roof of 9 sqm over a dog yard. The roof will stand on 3 posts on the somewhat lower side and 2 posts on the somewhat higher side. I have managed to dig out for footings on all posts except in one of the corners on the lower side. There I need to cast. My question; how long after I have cast this footing must I wait to 1. Install posts with a top beam 2. Add roof joists and metal roofing?

A week and then you can proceed. Fully cured after 28 days.

 

[witten]

For the purpose, the low load, etc., a couple of days if it's urgent.

Moreover, it's not the drying time but the curing time you're interested in

 

[zzelma]

For the purpose, the low load etc., a couple of days if in a hurry.

Furthermore, it's not the drying time but the curing time you are interested in

A couple of days for everything or just for step 1?

(if I pause too much, it might never get finished... )

 

[Jarlingar]

24 hours.

 

[witten]

A couple of days for everything or just for step 1?

(if I pause too much, it might never get finished... )

Totti.

 

[zzelma]

Thanks!

 

[vectrex]

Assuming it is not very under-dimensioned, I would say 24 hours since we are in a good temperature and humidity period for outdoor casting. After 48 hours, you have about 60% of the designed strength (which is reached after 28 days at a constant 20 degrees).

Many believe that concrete has fully cured after 28 days. However, this is not the case. When calculating and stating the strength of concrete, one starts from the strength after 28 days.

The rate of strength development is fastest in the beginning and gradually slows down. However, it "never" completely stops and continues to get stronger the longer it stands. It is estimated that you have concrete that is 30-40% stronger after 1 year than at 28 days, 70-80% stronger after 10 years, and about 120% stronger after 100 years.

 

[witten]

Assuming it is not very undersized, I say 24 hours since we are in a good temperature and humidity period for outdoor casting. After 48 hours, you have about 60% of the designed strength (which is reached after 28 days at a constant 20 degrees).

Many believe that concrete has fully cured after 28 days. However, this is not the case. When calculating and specifying the strength of concrete, the strength after 28 days is used as a reference.

The strength increase is fastest in the beginning and gradually slows down. However, it "never" stops completely and continues to become stronger over time. It is estimated that you have concrete that is 30-40% stronger after 1 year than at 28 days, 70-80% stronger after 10 years, and about 120% stronger after 100 years.

Interesting aspect that it is the 28-day strength, I knew that but never reflected on the implication. But your estimates for growth in the long term seem high. I've had a lot of old concrete lab-tested and have never seen such increases.

 

[Plupp 168520]

Interesting aspect that it is the 28-day strength, I knew it but never reflected on the significance. But your estimates for long-term growth seem high. I have had a lot of old concrete lab tested and have never seen such increases.

Interesting, have you tested the same concrete piece or part of the same concrete piece after one week, one month, one year, ten years, and 100 years?

 

[vectrex]

Interesting aspect that it is the 28-day strength, I knew that but have never reflected on its significance. But your estimates for growth in the long term feel high. I've had a lot of old concrete lab-tested and have never seen such increases.

There are plenty of studies showing what I am writing. The figures will vary greatly depending primarily on the concrete mix, but also on how the concrete has been exposed. Commonly, regardless of the mix, all concrete that hasn't cracked or experienced rust expansion or the like always gets stronger the longer time passes.