Concrete - Site Mix, ratio to achieve required strength?

Question

If I use portland cement and I want to achieve the following values:
1. 3,000psi in 7 days
2. 4,000psi in 7 days
Please include the volume of accelerator

Answer 1

what kind of concrete?

steam (heat) will also speed up the process, after the 3rd day.

soaking it in water after the 3rd day.

calcium chloride (with no steel reinforcement)
fly ash

just a few percent of the total volume, not more than 3%