Self loading concrete mixer - GIF

[tlnixon]

Concrete is really a precise formula and there are different formulas for the application. (e.g. structural, roadway, fast set maintenance mix etc.) I saw them loading sandy material, but no cement to make the concrete. This doesn't appear to be exacting-enough for me. I have a mixer and have mixed and poured my own, and can usually tell what is a good mix or whether it needs more cement, or aggregate etc. and especially how much water to add to make suitable concrete. It's a nice concept but I think needs some more refinement before it will replace the concrete mixing plant.