The machine produces concrete slabs for paths and roads, using shuttering boxes of foamed plastics with compartments for the slabs. A support (1) accommodates the boxes (3) so that they can slide freely. It has a first section (1') in which the empty box is sprayed with an adhesion inhibitor and the plastics or natural support plates are inserted manually. A second section (1'') has a hydraulic or pneumatic thrust ram for the boxes, as well as a holding-down station for the slabs (10), together with a concrete dispensing station, a scraper, and a vibrator mechanism. Other rams (22) then thrust the boxes into a discharge station and stack them there.
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