WM, looks like you have almost half your concrete you will need. I don't think you will need to add any more portland cement to the bags of pre-mix you have now. That concrete is usually rated at 3,000 p.s.i. after a 28 day cure, which will hold a heck of a lot more than any scope you may ever put on it. And all the time concrete is kept moist, it will continue to cure almost indefinitely. That is why concrete cured underwater is incredibly strong. And sorry Manny, but I stick with the 2" distance for the rebar, it's right out of the code book. And you should tie the bar together.
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Re: WidowMaker's observatory project under way!
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