An exemplary wiper assembly for use with a concrete mixer includes a wiper element configured to span a gap between a mixer barrel and a collector, and is configured for suspendedly coupling to a support frame separate from any coupling to the mixer barrel or the collector. One or more arm members are coupled between the concrete mixer and the wiper element. The arm member includes a tensioning portion that adjusts to move an upper edge of the wiper element into contact with the mixer barrel, and an elastic portion that enables the wiper element to adjust relative to each of the collector and the mixer barrel during rotation of the mixer barrel. Thus the wiper element has limited movement independent of rotation of the mixer barrel and of vibrational movement of the collector and mixer barrel due to movement of the concrete mixer over rough terrain, for example.