A cement mixer?

Along the river there were a lot of workers creating a new path along the side of the river. These type of walkways are along both sides of the rivers around these parts. I had not seen them under construction until yesterday.

It sounded like a cement mixer, but nothing like any that I had seen in Australia. There were piles of bags (looked like cement), and tins of some other ingredient that was used to make the paths. Down on the path there were workers spreading the stuff around and smoothing it out with a heated roller.

The paths look fabulous and the workmanship appears to be very good. I have spent a lot of time walking along these riverside paths.