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I doubt you had a bad batch of concrete. What I would have done was use sand mix W/O aggregate and add some cement to get the strength. They get the strength/PSI cheaply by using large aggregate. You can use more cement to get same strength with small aggregate but you need to add more cement because the aggregate has to be surrounded with it and it takes more to surround with small aggregate by volume than with big. Also the more cement you add the more water you can add maintaing strength and increasing the "cream "your looking for. Another good thing to do would be add fiberglass to the mix this serves same purpose as wire mesh, rebar etc. Your concrete will set even if over hydrated the strength will just less.
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