Apparatus for forming a series of spaced parallel grooves in the surface of a newly laid pavement slab characterized by engaging the surface of the pavement slab with a molding cylinder having a plurality of circumferential ribs formed thereon and moving the molding cylinder across the surface of the pavement slab while simultaneously rotating the molding cylinder about its longitudinal axis at a rate slightly greater than a free roll. Means are disclosed for preventing damage to the parallel edges of the pavement slab during the grooving process, and means are disclosed for simultaneously spraying water on the surface of the pavement slab and the surface of the molding cylinder during the grooving process.
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