Method of exposing aggregate in a poured concrete panel

Abstract From the Canadian patent

A method of making a cast concrete panel with coarse aggregate exposed on its upper face as cast comprising the steps of pouring and compacting wet concrete having a coarse aggregate content into a casting bed, leveling the upper surface of the concrete to the desired height by means that includes the passage thereover of a screed roller rotating in a direction to push excess surface concrete in advance of the screed roller lifting, coarse aggregate towards the upper surface of the concrete in advance of the screed roller by passing the free ends of rotating aggregate lifter arms through the concrete the aggregate lifter-, arms being spaced apart a distance to support coarse aggregate …