The video below is a time-lapse of the first hour of work.
A friend did some drainage work in his basement and needed to fill in the channels he had cut in the concrete slab. The only two options were a concrete pumping truck (expensive) or mixing by hand. He decided to mix by hand using a Rapid Mixer. The project went smoothly with two people and it took almost exactly 90 minutes to mix, pour, and trowel 35 bags (6 of which were 80 pounds) with a single mixer. The mixer definitely showed some signs of wear after the task was complete but apart from a small puncture (from a piece of rebar), it was still fully functional and mixed 10 more bags the next day.
It's the middle of winter and the ground is frozen solid in many parts of America. Frost-heave is an critical problem to account for before planning your structural concrete piers. Fine Homebuilding has a quick tip to get you started. Once you've completed your plans and purchased the right footing tubes, a Rapid Mixer will help make the concrete pour go smoothly.
A lot of planning and preparation needs to happen before you can begin mixing concrete with your Rapid Mixer. If you're building a deck, Fine Homebuilding has an excellent free article on deck foundation piers. They use an electric mixer to complete the pour but for less than the price of a rental, the same work can be accomplished with a Rapid Mixer in the time that it takes to drive to the rental store.
I helped a friend with a basement bathroom project and he needed a hand filling in the holes in the slab where the new plumbing had been installed. On the day of the pour, he was conveniently stuck working late. I decided to continue the pour myself since the Rapid Mixer works well with one or two people. I won't say the the last 4 bags were as easy as the first 5 but the whole job was completed in just over 30 minutes.