FR2907810A1 - Device for preparing a bituminous concrete - Google Patents

Device for preparing a bituminous concrete Download PDF

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Publication number
FR2907810A1
FR2907810A1 FR0609444A FR0609444A FR2907810A1 FR 2907810 A1 FR2907810 A1 FR 2907810A1 FR 0609444 A FR0609444 A FR 0609444A FR 0609444 A FR0609444 A FR 0609444A FR 2907810 A1 FR2907810 A1 FR 2907810A1
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FR
France
Prior art keywords
drum
mixer
kneader
filler
aggregates
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Granted
Application number
FR0609444A
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French (fr)
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FR2907810B1 (en
Inventor
David Devautour
Michael Devautour
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AP TECHNIC ASPHALT PLANT TECHN
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AP TECHNIC ASPHALT PLANT TECHN
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Publication date
Application filed by AP TECHNIC ASPHALT PLANT TECHN filed Critical AP TECHNIC ASPHALT PLANT TECHN
Priority to FR0609444A priority Critical patent/FR2907810B1/en
Publication of FR2907810A1 publication Critical patent/FR2907810A1/en
Application granted granted Critical
Publication of FR2907810B1 publication Critical patent/FR2907810B1/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027Mixing in a rotary receptacle
    • E01C19/1036Mixing in a rotary receptacle for in-plant recycling or for reprocessing, e.g. adapted to receive and reprocess an addition of salvaged material, adapted to reheat and remix cooled-down batches
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027Mixing in a rotary receptacle
    • E01C19/1031Mixing in a rotary receptacle the mixture being discharged continuously
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C2019/1081Details not otherwise provided for
    • E01C2019/1086Mixing containers having concentric drums
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C2019/1081Details not otherwise provided for
    • E01C2019/109Mixing containers having a counter flow drum, i.e. the flow of material is opposite to the gas flow

Abstract

The present invention relates to a device for preparing a continuous mix comprising a drum rotatably mounted about its longitudinal axis, a kneader arranged under the drum, comprising a rotary mixing means and a thermal envelope surrounding the drum.According to the invention , the rotary mixing means of the mixer rotates independently of the drum.

Description

The present invention relates to a device for preparing a concrete

  bituminous, also called asphalt, intended for the recovery of roads. Asphalt is mainly composed of at least a mixture of small pieces of stones, also called aggregates or aggregates and a binder, also called bitumen. In order to obtain this mixture, the proportions of which make it possible to produce a single formula, produced according to customer specifications, the aggregates are dried in a first step in a rotary drum provided with a burner disposed on its axis of rotation. Then, in a second step, the dry and hot aggregates are introduced into a kneader forming an entity distinct from the drum. Finally, in a third step, hot bitumen is poured onto the aggregates through the kneader and the mixture is mixed to form a homogeneous paste constituting the mix. These steps can be performed continuously or discontinuously. An asphalt preparation device performing these steps is for example described in the French patent application FR-A-2 631 354. In this document, the new aggregates are dried and heated in the drum and recycled asphalt pieces are warmed in contact with hot new aggregates. The bitumen contained in recycled mixes melts and spreads on new aggregates. The aggregates thus pre-coated are introduced into the kneader. Liquid bitumen is then introduced into the kneader to ensure the final coating of the aggregates and the formation of asphalt.

  The disadvantage of such a device is related to the amounts of energy needed to make it work. Indeed, the aggregates must be sufficiently heated to be able to heat in turn the recycled mix. In addition, the pre-coated aggregates lose heat as they are transferred from the drum to the mixer. Finally, the kneader must be heated so that the output asphalt is at a sufficient temperature.

  US-A-5,261,738 discloses an example of a mix preparation device in which the useful energy is saved. This device comprises a rotary drum provided with a burner into which the aggregates to be dried are introduced. It further comprises a kneader constituted by a circular space disposed coaxially and at the periphery of the drum. Blades attached to the periphery of the drum move in the mixing space as the drum rotates. Thus, the mix formed by the kneader is maintained at temperature by its contact with the hot drum. The disadvantage of this device is that the mixing is carried out at the speed of rotation of the drum. However, it may sometimes be advantageous to mix at different speeds, especially when additives are added. The object of the present invention is therefore to provide a mix preparation device having a good thermal efficiency and allowing a mixing speed variation. To this end, the present invention relates to a continuous mix preparation device comprising a drum rotatably mounted about its longitudinal axis, a kneader arranged under the drum, comprising a rotary mixing means and a thermal envelope surrounding the drum, characterized in that the rotary blending means of the kneader rotates independently of the drum. The device according to the invention has both a good thermal efficiency and a capacity of adaptation of the mixer to the products, these elements not being dependent on one another. According to an advantageous characteristic of the invention, the thermal envelope is arranged partly around the drum and partly between the drum and the kneader so as to ensure the junction between the drum and the kneader.

The thermal envelope of the invention allows both to maintain heat in the drum and to use it to heat the kneader. According to a particular embodiment, the rotary mixing means is driven by a motorized assembly capable of rotating at several speeds. The speed of the kneader can thus be adapted to the products which are introduced into the kneader. According to a preferred embodiment of the invention, the rotary mixing means is a set of two trees arranged side by side and each provided at its periphery with blades.

According to another advantageous characteristic of the invention, the thermal envelope comprises openings for introducing products via ducts directly into the kneader. The thermal envelope allows the introduction of products directly into the kneader without opening constraints of the kneader. In addition, the products can be introduced at the precise place where it is desired to mix them with other products. According to another advantageous characteristic of the invention, the kneader comprises, from upstream to downstream, an inlet for dry aggregates coming from the drum, an inlet for bitumen, an inlet for recycled asphalt, an inlet for aggregates also called filler and an entry for additives. Each input allows the introduction into the mixer of a product and thus the products can be introduced in the chosen order. The invention also relates to a process for the preparation of a continuous mix in a device according to the invention. This process consists in inserting in order in the mixer: dry aggregates from the drum, then the bitumen and finally the filler. According to an advantageous embodiment of the invention, the method further comprises inserting into the mixer between the bitumen and the filler, recycled mix. According to an advantageous embodiment of the invention, the method further consists in inserting additives such as filler, sand, dyes and fibers into the kneader after the filler. The features of the invention mentioned above as well as others will emerge more clearly on reading the following description of an exemplary embodiment, said description being made in relation to the attached drawings, among which: FIG. 1 is a side view of an asphalt preparation device according to the invention, and FIG. 2 shows a sectional view along the plane A-A of FIG. 1 of the asphalt preparation device according to the invention.

The asphalt preparation device according to the invention 1 is of continuous type, that is to say that it allows the uninterrupted production of bituminous concrete also called asphalt. It comprises a movable support platform 10 provided with support feet 100 and an axle 110. The support legs 100 support the device 5 when it is not in use or on the contrary when it is put into operation. When the support feet 100, are mounted, the support platform 10 is slightly inclined in a direction opposite to the axle 110. The axle 110 makes it possible to make the mobile device allowing its movement on this axle, the support legs 100 are then moved to a position in which they do not touch the ground so as not to hinder the movement of the support 10. On this support platform 10, are mounted, a drum 12, a thermal envelope 14, a mixer 18 and a burner 16. The drum 12 is cylindrical and rotatably mounted about its longitudinal axis of symmetry. It is intended to dry and heat aggregates A introduced at a first end 12a of the drum 12 via a conveyor 11. The burner 16 is placed at a second end 12b of the drum 12 which is preferably the lowest of the This second end 12b is opposed to the first end 12a through which the aggregates A are introduced. The burner 16 produces a flame F at a temperature of about 1200 to 1400 C. extending longitudinally in the drum 12 at its axis of rotation. This flame F is intended to dry and heat the aggregates A. The thermal envelope 14 surrounds the drum 12 over part of its length, approximately at the location of the flame F produced by the burner 16. Thermal 14 acts as a thermal insulator. It prevents heat leakage from the drum 12 and between the drum 12 and the mixer 18. The thermal envelope 14 has several openings 141 and 143 through which can be inserted conduits 140 and 144 for introducing The feeders 142 and 180 also make it possible to introduce products into the mixer 18. The mixer 18 is placed under the drum 12 and vertically. The heat envelope 14 makes the connection between the drum 12 and a tank 181 forming the bottom of the kneader 18 (see Fig. 2). This tank 181 is pivotable, that is to say it can be inclined relative to the support platform 10 along an axis X transverse to the tank 181. Thus, the inside of the mixer 18 can be easily cleaned. The kneader 18 comprises two shafts 182 arranged side by side horizontally so as to drive the forming asphalt towards the outlet which is at the highest end of the kneader 18. These shafts 182 are preferably in the form of screws without end. These shafts 182 are rotated by a motorized assembly 184. Each shaft 182 comprises blades 183 capable of mixing the products introduced into the mixer 18. An outlet chute 186 is provided at the outlet of the mixer 18 to allow embedded in the kneader 18 to be conveyed to a storage hopper (not shown). The operation of the asphalt preparation device according to the invention is as follows: the drum 12 and the kneader 18 are arranged one above the other in the same plane, so that the flows of material respectively circulating in each of these elements are reversed. The aggregates A used for the manufacture of the mix are calibrated in pre-dosing devices (not shown) and are conveyed to the first end 12a of the drum 12. Aggregates A, generally used for this purpose, comprise about 5% humidity. Their size established by the predosage devices is determined according to the formula of the mix to be prepared. In the drum 12, the aggregates A are driven in rotation and aided by the slight slope imposed by the inclination of the support platform 10 and thus move to the burner 16. During their movement along the drum 12, they are dried and reheated to a temperature of between about 140 ° C. and about 280 ° C. Preferably, the aggregates A will be heated to a temperature of around 280 ° C if it is intended to add exceptionally recycled mix to the mix formed in the mixer 18. Conversely, if this contribution of recycled asphalt is not provided, the temperature of the aggregates A will be increased to about 140 C. The dust aggregates A, also called fines or filler, are recovered in a filter (not shown) via decompression chamber 20. The filter used is preferably a bag-type filter. This filter is able to suck up and separate the dust from aggregates A circulating in the drum 12. Advantageously, this filter makes it possible to suck up the dust in the drum 12 without the risk of sucking up other substances such as fumes. hydrocarbons released by the mixture from the kneader 18, which substances are burned by the flame F of the burner 16 in the drum 12. The decompression chamber 20 is arranged near the first end 12a of the drum 12 and communicates with a on the one hand, with the drum 12 and, on the other hand, with the filter through a duct (not shown) connected to an opening O provided on one of its walls. This decompression chamber 20 has the role of creating an intermediate zone between the drum 12 and the filter in which the air and dust aggregates suspended in the air drum 12 are sucked. In the decompression chamber 20, the velocity of the air is reduced so that the heaviest airborne aggregate dust settles down. The lighter dust remains suspended in the air circulating in the decompression chamber 20. The decompression chamber 20 thus performs a first separation of the aggregate dust. The air with the lightest dust is sucked from the decompression chamber 20 to the filter. In the filter, the dust remaining in suspension in the air is filtered. The filter thus performs a second separation of the aggregate dust. The dust thus obtained by filtering is stored in the filter. These dusts constitute the filler f. This tiller f will be introduced into the mixer 18 to manufacture the mix. The drum 12 has vanes 120 regularly distributed on its inner surface (see Fig. 2). When the drum 12 rotates, the blades 120 drive the aggregates A which are thus stirred and dry quickly in contact with the flame F. The aggregates A thus move from the end 12a through which they are introduced to the source S of the flame F. At this point, the drum 12 communicates with the kneader 18 via the heat envelope 14. The aggregates A, which are dry and heated to about 140 ° C. to 280 ° C., are thus discharged into the kneader. 18 there. In the region of the drum 12 which is covered by the thermal envelope 14, other products are introduced through conduits 142 and 180 passing through the thermal envelope 14. Bitumen D is introduced in particular through the conduit 180 and the filler f from filtering is introduced into the conduit 142. The conduits 142 and 180 open into the mixer 18. Other products may optionally be introduced into the mixer 18 through conduits 140, 144 through the thermal envelope 14. These products are in particular recycled mix B, introduced by a first conduit 140 and additives C of all kinds such as fibers, iron oxide, dyes, sand or particulate filler filler finely crushed mineral introduced by a second conduit 144. The input filler is not derived from filtering but from a storage silo provided for this purpose. The aggregates A dropped into the kneader 18 are first mixed with liquid bitumen D heated to 160 ° C., introduced via the pipe 180. The bitumen D which has a flash point at approximately 220 ° C. undergoes a cracking phenomenon. when brought into contact with hot aggregates. There is then release of water vapor and hydrocarbons. The water vapor from the aggregates A and the hydrocarbon vapors produced by the bitumen D back to the burner 16 where they are burned by the flame F of the burner 16. This rise is obtained thanks to a fan that includes the filter which creates a slight depression in the drum 12. Thus, no toxic gas discharge is released into the atmosphere. The paste formed of bitumen D and aggregates A may then advantageously be mixed, if desired, with the recycled mix B. Next, the filler f resulting from the filtering is introduced through the conduit 142 via a booster pump into the mixer 18 where it mixes in turn with the paste 2907810 8 asphalt forming. This filler being vaporized on the dough in formation does not form balls of fines or inclusions in the dough. Distributed in a homogeneous manner, the filler f makes it possible to increase the mechanical bonding of the aggregates A with the bitumen D. Finally, other products or additives C such as the filler can be introduced into the kneader 18 by the 144. These additives C and in particular the filler filler are introduced at the end to prevent the formation of balls of fines in the mix paste. After the various contributions in the kneader 18, mixing the asphalt paste is continued to the output of the kneader 18.

Advantageously, the kneading speed can be adjusted independently of the rotational speed of the drum 12, which makes it possible to adapt the kneading to the type of additive introduced into the kneader 18. A homogeneous paste of asphalt at about 160 ° C. is obtained from the mixer 18 through the outlet chute 1 86 and transported via a scraper lift (not shown) to a storage hopper (not shown). In the hopper, the mix is stored at a temperature of 160 ° C. in order to be spread on the roads at a temperature of 130 ° C. The thermal envelope of the preparation device according to the invention advantageously makes it possible to avoid the losses of heat between the drum 12 and the kneader 18 20 and, as a result, allows both to obtain a good thermal efficiency and to reduce the amount of energy required (fuel) to its operation, particularly at the level of the kneader 18 which maintains a constant temperature of the asphalt in formation. The destruction of hydrocarbon vapors by the burner reduces harmful emissions to the atmosphere more than a conventional installation.

This is made possible thanks to the junction created by the thermal envelope 14 between the drum 12 and the mixer 18. The quantity of bitumen D necessary for the formation of asphalt is also reduced because of the introduction of asphalt. recycled in the mixer. In addition, the filler introduction mode f also contributes to this bitumen economy because of the improved mixing it provides.

Claims (9)

  1) Continuous mix preparation device comprising a drum (12) rotatably mounted about its longitudinal axis, a kneader (18) arranged under the drum (12), comprising a rotary mixing means (182, 183) and a thermal envelope (14) surrounding the drum (12), characterized in that the rotary mixing means (182, 183) of the mixer (18) rotates independently of the drum (12).
  2) Device according to claim 1, characterized in that the thermal envelope (14) is arranged partly around the drum (12) and partly between the drum (12) and the mixer (18) so as to ensure the junction between the drum (12) and the mixer (18).
  3) Device according to claim 1 or 2, characterized in that the rotary mixing means (182, 183) is driven by a motor assembly adapted to rotate at several speeds.
  4) Device according to one of claims 1 to 3 characterized in that the rotary mixing means is a set of two shafts (182) arranged side by side and each provided at its periphery with blades (183).
  5) Device according to one of the preceding claims, characterized in that the thermal envelope (14) comprises openings (141, 143) for introducing via conduits (140, 142, 144, 180) of produced directly in the mixer (18).
  6) Device according to one of the preceding claims, characterized in that the mixer (18) comprises from upstream to downstream an inlet for aggregates (A) dry from the drum (12), an inlet for bitumen (D) , an inlet for recycled mix (B), an inlet for filler (f) and an inlet for additives (C).
  7) Process for the preparation of continuous mix in a device according to claim 6, characterized in that it consists in inserting in order in the mixer (18): dry aggregates (A) from the drum (12) , then bitumen (D) and filler (f). 2907810 10
  8) Process for the preparation of asphalt mix according to claim 7, characterized in that it further consists in inserting in the mixer (18) between the bitumen (D) and the filler (f) of the recycled mix (B) .
  9) Process for the preparation of asphalt mix according to claim 7 or 8, characterized in that it further consists in inserting in the kneader (18), after the filler (f), additives (C) such as filler filler, sand, dyes, fibers.
FR0609444A 2006-10-27 2006-10-27 Device for preparing a bituminous concrete Active FR2907810B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0609444A FR2907810B1 (en) 2006-10-27 2006-10-27 Device for preparing a bituminous concrete

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0609444A FR2907810B1 (en) 2006-10-27 2006-10-27 Device for preparing a bituminous concrete
EP07020986.1A EP1916337B1 (en) 2006-10-27 2007-10-26 Device for preparing a bituminous concrete
ES07020986.1T ES2637503T3 (en) 2006-10-27 2007-10-26 Device for the preparation of a bituminous mixture

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FR2907810A1 true FR2907810A1 (en) 2008-05-02
FR2907810B1 FR2907810B1 (en) 2008-12-26

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ES (1) ES2637503T3 (en)
FR (1) FR2907810B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2927094B1 (en) * 2008-02-01 2015-07-17 Eurovia Process for manufacturing a bituminous spray with simultaneous introduction of the binder and a part of the solid mineral fractions in the mixer
CN104452532B (en) * 2014-11-13 2017-03-15 福建南方路面机械有限公司 Can self-cleaning regeneration asphalt drying drum and self cleaning method
FR3067371A1 (en) * 2017-06-09 2018-12-14 Ermont Installation and process for producing coils

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4715720A (en) * 1984-11-05 1987-12-29 Astec Industries, Inc. Drum mix asphalt plant with knock-out box and separate pugmill coater
US5002398A (en) * 1989-06-16 1991-03-26 Cedarapids, Inc. Apparatus for and methods of producing a hot asphaltic material
US5054931A (en) * 1987-04-06 1991-10-08 Barber-Greene Co. Counterflow asphalt drum mixer producing less hydrocarbon emissions and a method used therein
US6164809A (en) * 1998-11-30 2000-12-26 Hawkins; Michael R. Counter-flow asphalt plant with independently rotatable dryer and mixer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2631354B1 (en) * 1988-05-13 1994-04-22 Ermont Cm

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4715720A (en) * 1984-11-05 1987-12-29 Astec Industries, Inc. Drum mix asphalt plant with knock-out box and separate pugmill coater
US5054931A (en) * 1987-04-06 1991-10-08 Barber-Greene Co. Counterflow asphalt drum mixer producing less hydrocarbon emissions and a method used therein
US5002398A (en) * 1989-06-16 1991-03-26 Cedarapids, Inc. Apparatus for and methods of producing a hot asphaltic material
US6164809A (en) * 1998-11-30 2000-12-26 Hawkins; Michael R. Counter-flow asphalt plant with independently rotatable dryer and mixer

Also Published As

Publication number Publication date
ES2637503T3 (en) 2017-10-13
FR2907810B1 (en) 2008-12-26
EP1916337A1 (en) 2008-04-30
EP1916337B1 (en) 2017-05-24

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