The construction, maintenance, or repair of concrete parking lots, sidewalks, driveways, concrete foundations, concrete columns, beams, walls, floors, roofs, curtain walls, precast and prestressed concrete foundations, structures, slabs, tennis courts, etc. Includes forms, slipforms, reinforcing rods and wire mesh, and the use of technologies for grouting, guniting, shotcreting and pumping. Does not include concrete for highways, streets, or bridges.