Just a note, I tried this a few weekends ago. I used the regular bagged stuff mixed it in my wheel borrow and dumped it in with a couple bigger rocks. In the past when I have helped pour sidewalks or other things with from a concrete truck we took the forms off the next morning. Not so with this stuff in my case. It needed to sit at least a week. I had also poured a base for my aeration that was just formed. Anyway how long should the bagged stuff sit to cure? Mine stayed soft for over a week. I didnt know why it would be bad but a week or 2 later it sat up. During that time it was out of my bucket mold so it broke so I will start over again.
good luck
Dave
Cement can get old and lose its strength in making concrete. Sounds like you might have had some old cement. Cement has a shelf life. If I have an older bag of cement or quickcrete that I want to use up, I'll spike it with some fresh cement to make sure it sets up.
