How long would approximately 3 deformed rebar rust and crack through concrete if the bars were forming stakes and come from ground into concrete?

Until all the rebar is gone. Rebar is just low grade steel with next to nothing in it to prevent rust. After a surface coat of rust gets on it (2-3 days) it will slow the process but it will never...

Concrete cracks. You can do everything right and use the best materials, it will still have hairline cracks. It's normal.

A company by the name of KoverKrete Systems (www.koverkrete.com or 407.246.7797) manufactures a product called "POOF" which removes concrete from concrete tools, mixers without harm to painted...

Concrete gets progressively harder over time its called curing. However it depends on several thing like temperature and moisture. You can typically walk on concrete the next day but it can be prone...

reinforced concrete