A concrete saw for cutting a concrete slab incorporating a rollable trolley having upper, lateral, front, and rear ends; an engine fixedly attached to the rollable trolley, the engine having a rotary power output; a blade connected operatively to the engine's rotary power output for, upon movement of the first rollable trolley over the concrete slab, slotting said slab and drawing concrete cuttings therefrom; a shroud fixedly attached to the first rollable trolley, the shroud having a plurality of side walls, a floor, and a ceiling, the shroud housing the blade, and defining a dust containment space; an Archimedes' screw having input and output ends, the Archimedes screw's input end being positioned within the shroud's dust containment space; power transfer gears connected operatively to the Archimedes screw's for conveying the concrete cuttings from the Archimedes screw's input end to the output end; and a receptacle under the output end.