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https://theconstructor.org/concrete/concrete-curing-time-duration/11119/
Why the curing of cement concrete is required? The curing of cement concrete is required for the following reasons-1. To prevent the concrete from drying out prematurely due to solar radiation and wind. 2. To maintain the concrete temperature by allowing the hydration process. 3. To harden and bond with internal materials and reinforcement.
https://www.cement.org/docs/default-source/fc_concrete_technology/durability/is536-types-and-causes-of-concrete-deterioration.pdf?sfvrsn=4
Concrete can deteriorate for a variety of reasons, and concrete damage is often the result of a combination of factors. The following summary discusses potential causes of concrete deterioration and the factors that influence them. CORROSION OF EMBEDDED METALS Fig. 1. Corrosion of reinforcing steel is the most common cause of concrete deterioration.
https://civilweb-spreadsheets.com/reinforced-concrete-design/concrete-strength-at-7-days/
The compressive strength of concrete at 7 days is often required for two reasons. Firstly it may be necessary to begin loading a concrete member after only around a week in order to meet the construction programme.
https://www.constructionyeti.com/why-construction-workers-start-so-early/
Typically a concrete load must be placed within about 1.5 to 2 hours of being batched or the concrete starts to set up. This time is eaten up by drive time, queue time onsite, pumping time, and placing time. If there is heavy traffic and possibly even a wreck, then the likelihood of having to discard the truck goes up.
https://theconstructor.org/concrete/why-we-test-concrete-strength-after-28-days/6060/
After 14 days of casting concrete, concrete gains only 9% in next 14 days. So, rate of gain of strength decreases. We have no clear idea upto when the concrete gains the strength, 1 year or 2 year, but it is assumed that concrete may gain its final strength after 1 year. So, since the concrete strength is 99% at 28 days, it's almost close to its final strength, thus we rely upon the …
https://www.quora.com/Whats-the-reason-concrete-would-not-set-after-2-days
After application of the concrete, the constituents of the cement start getting hydrated and the time of gaining minimum strength is generally 24 hours. You need more seven days to harden it to withstand future loads.
https://www.eng-tips.com/viewthread.cfm?qid=439835
Wearing the "formwork" hat: ACI 347 (Guide to formwork for concrete) in its section 3.8 has a section for hours or days between a pour and when you can remove the formwork. This doesn't address your question about min f'c, but here they explicitly cover themselves by saying you need to consider any shoring that may need to stay in place.
https://engineeringdiscoveries.com/4-common-causes-of-cracking-in-concrete/
https://www.concretenetwork.com/concrete/concrete_cracks/preventing_concrete_cracks.htm
Reason #1 - Excess water in the mix. Concrete does not require much water to achieve maximum strength. But a wide majority of concrete used in residential work has too much water added to the concrete on the job site. This water is added to make the concrete easier to install. This excess water also greatly reduces the strength of the concrete.
https://www.cnn.com/2021/11/19/politics/kevin-mccarthy-trump/index.html
The real reason Kevin McCarthy just talked for 8 hours straight. Analysis by Chris Cillizza, CNN Editor-at-large. Updated 10:05 AM ET, Fri November 19, 2021 . JUST WATCHED
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