Abstract: A wheelbarrow mounting a container having upright side and end walls includes a generally U-shaped, upwardly opening cutout in one of the end walls. A mixing unit can be mounted to the wheelbarrow by placing a mounting plate of the unit over the cutout. The mixing unit comprises an elongate shaft protruding through the mounting plate into the container and means for driving the shaft. A mixing blade defined by axially spaced first and second arms which are angularly offset with respect to each other and attached to the shaft adjacent the mounting plate and adjacent a free shaft end, respectively, is also provided. The first arm of the blade extends radially away from the shaft and the second arm extends radially and axially away from the free shaft end while a generally longitudinally extending, twisted blade section interconnects free ends of the first and second arms.