Abstract: The device comprises a roadstone spreader having roadstone flap-doors which are juxtapositioned the transverse direction and which are of equal width, and a rail for spreading bituminous binder facing spreading zones for roadstone via the roadstone flap-doors. The rail f comprises a first set of nozzles which produce jets which cover approximately three pitches of an impact zone of the road surface and nozzles of a second set of nozzles which are interposed between the nozzles of the first set and which are supplied in order to produce margin jets having an impact zone which extends approximately over two pitches over the road surface.

Abstract: The device comprises a roadstone spreader having roadstone flap-doors which are juxtapositioned in the transverse direction and which are of equal width, and a rail for spreading bituminous binder facing spreading zones for roadstone via the roadstone flap-doors. The rail f comprises a first set of nozzles which produce jets which cover approximately three pitches of an impact zone of the road surface and nozzles of a second set of nozzles which are interposed between the nozzles of the first set and which are supplied in order to produce margin jets having an impact zone which extends approximately over two pitches over the road surface.

Abstract: The device comprises a drum drier with parallel streams (1) fed with recycled materials and a drum drier and countercurrent mixer (2) fed with virgin aggregates at its entry end (2a). The exit end (1b) of the drum with parallel streams (1) through which the dried and preheated recycled materials leave is connected to a ring (26) for introducing materials through the side wall of the countercurrent drum (2) through a chute for transferring the recycled materials. The ring (26) for introducing the recycled materials opens into a recycling and mixing zone (23) situated in the countercurrent drum (2) around the body of the burner (10), between the flame zone (22) and the mixing zone (24). The dried and heated recycled materials (8) are transferred continuously into the recycling zone (23) of the countercurrent drum (2).

Abstract: The drying/coating drum comprising a burner (20) whose body (19) penetrates via the discharge end (3) of the drum into a zone which is distant from this end. The gases and the solid materials circulate countercurrent-wise in the drum. The body (19) of the burner (20), fixed relative to the drum (1), is disposed inside an outer peripheral sleeve (22) which is free in rotation about the body (19) of the burner (20). The outer sleeve (22) is connected to the casing (1) of the drum. The end of the outer sleeve (22) corresponding to the end (19a) of the burner from which the flame (14) develops carries a plurality of radially directed blades (25, 26) forming a turbine for sucking gas into the mixing zone (30) and a screen against radiation from the flame (14) of the burner (20) during rotation of the drum.

Abstract: A mixer (10) consisting of a stationary casing (9), into which the outlet end (2b) of a rotary drum (2) opens, and mixing vanes fixed to the casing of the drum (2) and extending this casing axially in the direction of its outlet (2b). A burner (13) having an elongate body (12) projects into the drum (2) at its outlet end (2b) and opens into a flame zone (22). A recycling ring (32) is arranged around the drum (2) in the vicinity of the end (12a) of a burner. The casing (9) of the mixer delimits a mixing zone (36), separate from the flame zone (22), around the body (12) of the burner.

Abstract: A burner (13) and a conveyor (6) for aggregates (7) into the drum (2) penetrate into the drum at opposite ends (2a, 2b). Circulation of the gases inside the drum occurs in direction opposite to circulation of the aggregates. The burner has an elongated body (12) arranged in the axial direction of the drum. The drum comprises, from the inlet end (2a) to the outlet end (2b), a drying zone (21), a flame zone (22), a zone for introducing recycled mixes (23') and a heating and mixing zone (23). The device may be associated with a mixer (42) of the conventional type in which the bituminous products (11) leaving the drum (2) are mixed with liquid bitumen and worked. The invention enables coated products for road surfaces to be prepared without the production of bitumen vapor.

Abstract: The solid materials circulating inside the drum are raised between a zone (22) in which the flame of the burner (12) is produced and a mixing zone (30) by raising vanes (18, 18') which form a dense screen of materials isolating the mixing zone (30) from the flame zone (22) as a result of the solid materials being raised and falling back down when the drum (2) is rotated. Recycled materials may be introduced into the zone (23) where the dense screen is formed.

Abstract: Process and device for fabricating bituminous coated products from aggregates enclosing a large quantity of fines, using a drying-mixing drum having a case (1) provided internally with fins of which some effect a complete raising of the aggregates in a drying zone (7, 8). Liquid bitumen is incorporated in the aggregates at the end of the drying zone (7, 8) with a raising of the aggregates. The hot mixing of the aggregates and the bitumen is effected in a zone (9) where the aggregates remain in contact with the wall of the drum. The excess fines in the hot gases at the outlet (3) of the drum are recovered. The process is also applicable in the use of recycled materials for producing the coated products.

Abstract: The apparatus is constituted by a rotatable drum (1). The solid materials and the hot gases coming from a burner (6) flow in the same direction. The drum has an introduction zone (16), a transfer zone (17), an intermediate zone (18) and a zone (19) for hot mixing of aggregates and bituminous materials. The intermediate zone (18) has a first part in which lifting paddles (28) disposed on the inner wall of the drum (1) allow a continuous curtain of materials to be formed over the whole section of the drum (1) and a second part into which the solid materials degradable at high temperature are introduced. In this second part, the drum (1) has a second inner casing (31) coaxial with its outer casing (1), equipped inside with lifting paddles (32).The invention is particularly applicable to producing coated products for road use, from recycled materials.