Abstract: A mixer for combining solid material such as asphalt shingles and/or recycled asphalt with asphalt binder. A method of using the mixer includes inputting large chunks of solid material to a first inlet of the mixer, inputting liquid asphalt binder to a second inlet of the mixer, passing the large chunks of solid material and the asphalt binder through a mixer chamber having a first stage and a second stage, the first stage comprising a helical screw and the second stage comprising a plurality of paddles, and obtaining a uniform mixture comprising small chunks of solid material and asphalt binder from the mixer.

Abstract: A device for producing small-scale batches foamed bitumen. The device has a first pressurized, holding chamber for heating bitumen to a selected temperature, a second pressurized, holding chamber for heating bitumen additive (e.g., a foaming agent or chemical additive) to a selected temperature, and various conduits and valves as needed for delivering heated and pressurized bitumen with heated and pressurized additive to a mixing chamber having a selected volume to produce foamed bitumen.