[thijson]

One thing I've learned with concrete recently is that the drum mixer is less efficient than the mud mixer. For the drum mixer you prepare batches, the consistency between batches may not be very good. The batch of concrete is pretty heavy too. The mud mixer has a steady dribble of concrete coming out of the tip, you can be doing other things while it comes out. It's not as heavy to reposition either. The consistency of the concrete is better too.

If a concrete truck can reach the spot, that's the easiest.

This video shows a mud mixer in action around the 25 minute mark.

https://youtu.be/CbrZX6n3F-g

[cf100clunk]

The water source is also a factor if you're using a portable drum mixer. One batch from a well can be quite different from another batch from a treated water system or a running creek.

EDIT: kids, don't pour fuel into a generator right along a creekside without a funnel or care for the enviroment (~25 minute mark of that video)