A truism is that it's often not what you do know but what you don't know that brings you to trouble's doorstep. The real challenge, though, is that there is no end to learning—there is more to know than any one person can possibly learn. For instance, there are so many interactions between concretes, admixtures, weather conditions, labor, and jobsite circumstances that one can never control them all, and the variables increase when you add color to your work.
My job is to research and write articles that will be helpful to you in your work. I still have an opportunity to place and finish concrete every now and then, but it seems that the more I learn the more I wonder about what are the best field decisions. Hopefully our articles help you clarify things in your mind rather than presenting you with more than you ever wanted to know.