EP1916337B1 - Vorrichtung zur Herstellung eines Asphaltbetons - Google Patents

Vorrichtung zur Herstellung eines Asphaltbetons Download PDF

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Publication number
EP1916337B1
EP1916337B1 EP07020986.1A EP07020986A EP1916337B1 EP 1916337 B1 EP1916337 B1 EP 1916337B1 EP 07020986 A EP07020986 A EP 07020986A EP 1916337 B1 EP1916337 B1 EP 1916337B1
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EP
European Patent Office
Prior art keywords
drum
mixer
filler
aggregates
inlet
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Active
Application number
EP07020986.1A
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English (en)
French (fr)
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EP1916337A1 (de
Inventor
David Devautour
Michael Devautour
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Ap Technic Asphalt Plant Technic
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Ap Technic Asphalt Plant Technic
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Publication of EP1916337A1 publication Critical patent/EP1916337A1/de
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Publication of EP1916337B1 publication Critical patent/EP1916337B1/de
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, 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
    • E01C19/10—Apparatus 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
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027—Mixing in a rotary receptacle
    • E01C19/1036—Mixing 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
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, 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
    • E01C19/10—Apparatus 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
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027—Mixing in a rotary receptacle
    • E01C19/1031—Mixing in a rotary receptacle the mixture being discharged continuously
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, 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
    • E01C19/10—Apparatus 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
    • E01C2019/1081—Details not otherwise provided for
    • E01C2019/1086—Mixing containers having concentric drums
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, 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
    • E01C19/10—Apparatus 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
    • E01C2019/1081—Details not otherwise provided for
    • E01C2019/109—Mixing containers having a counter flow drum, i.e. the flow of material is opposite to the gas flow

Definitions

  • the present invention relates to a device for preparing a bituminous concrete, also called asphalt, 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.
  • the aggregates are dried in a first step in a rotary drum provided with a burner disposed on its axis of rotation.
  • the dry and hot aggregates are introduced into a kneader forming an entity distinct from the drum.
  • hot bitumen is poured onto the aggregates through the kneader and the mixture is mixed to form a homogeneous paste constituting the mix.
  • 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.
  • the document US-A-5,261,738 describes an example of an asphalt 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 can sometimes be interesting to knead at different speeds, especially when additives are added.
  • the object of the present invention is to provide a preparation device for asphalt having a good thermal efficiency.
  • the present invention relates to a continuous mix preparation device according to claim 1 and 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, the rotating mixing means of the mixer rotating 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.
  • 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 makes it possible both to maintain the heat in the drum and to use it to heat the kneader.
  • 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.
  • the rotary mixing means is a set of two trees arranged side by side and each provided at its periphery with blades.
  • the thermal envelope comprises openings for introducing via conduits products directly into the mixer.
  • the thermal envelope allows the introduction of products directly into the mixer without opening constraints of the mixer.
  • the products can be introduced at the precise place where it is desired to mix them with other products.
  • 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 dusts of 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, then the recycled mix and finally the filler.
  • the method further comprises inserting into the mixer, after the filler, additives such as filler filler, sand, dyes, fibers.
  • 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 when it is not in use or on the contrary when it is put into operation.
  • the support platform 10 is inclined slightly 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 then being moved to a position in which they do not touch the ground so as not to hinder the movement of the support 10.
  • the drum 12 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 heating 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 due to the inclination of the support platform 10. This second end 12b is opposite 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 where the flame F produced by the burner 16 is located.
  • the thermal envelope 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 produced in the mixer 18.
  • the conduits 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 thermal envelope 14 is the link between the drum 12 and a tank 181 forming the bottom of the mixer 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.
  • the inside of the mixer 18 can be easily cleaned.
  • the mixer 18 comprises two shafts 182 arranged side by side horizontally so as to cause the asphalt forming towards the outlet which is at the highest end of the mixer 18. These shafts 182 are preferably in the form of worm . 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 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.
  • 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 about 140 ° C to about 280 ° C. Preferably, the aggregates A will be heated to a temperature of around 280 ° C. if it is intended to exceptionally add recycled mix to the mix formed in the mixer 18. On the other hand, if this supply of mix recycled is not expected, the temperature of aggregates A will be increased to around 140 ° C.
  • Aggregate dust A also referred to as fines or filler, is recovered in a filter (not shown) via a 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.
  • 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 mix from the kneader 18, substances which are burned by the flame F of the burner 16 in the drum 12.
  • the decompression chamber 20 is disposed near the first end 12a of the drum 12 and communicates on the one hand with the drum 12 and on the other hand with the filter through a duct (not shown) connected to the an opening O provided on one of its walls.
  • This decompression chamber 20 has for role of creating an intermediate zone between the drum 12 and the filter in which air and dust aggregates suspended in the air drum 12 are sucked.
  • the velocity of the air is reduced so that the heaviest airborne aggregate dust settles down.
  • the lightest dust remains in suspension 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.
  • the dust remains suspended in the air are 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 filler f will be introduced into the mixer 18 to manufacture the mix.
  • the drum 12 has blades 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 and move from the end 12a through which they are introduced to the source S of the flame F.
  • the drum 12 communicates with the mixer 18 via the thermal envelope 14.
  • the aggregates A dry and heated between 140 ° C and 280 ° C, are therefore poured into the mixer 18 at this location.
  • conduits 142 and 180 In the region of the drum 12 which is covered by the thermal envelope 14, other products are introduced through conduits 142 and 180 through the thermal envelope 14. Bitumen D is introduced in particular through the conduit 180 and the filler f from the 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 fill filler composed of mineral particles finely crushed, introduced by a second conduit 144.
  • the filler filler is not derived from filtering but 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 phenomenon of cracking when brought into contact with hot aggregates.
  • 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 can then advantageously be mixed, if desired, with the recycled mix B.
  • the filler f resulting from the filtering is introduced through the conduit 142 by a booster into the mixer 18 where it mixes in turn with the asphalt paste in formation.
  • This filler being vaporized on the dough in formation does not form balls of fines or inclusions in the dough.
  • the filler f makes it possible to increase the mechanical bonding of the aggregates A with the bitumen D.
  • additives C such as filler filler may be introduced into the kneader 18 via the conduit 144. These additives C and in particular the filler filler are introduced at the end to to avoid the formation of balls of fines in the asphalt paste.
  • the kneading speed can be set 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 derived from the mixer 18 through the outlet chute 186 and transported via a scraper lift (not shown) to a storage hopper (not shown).
  • the asphalt is stored at a temperature of 160 ° C so that it can be spread over 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 heat losses between the drum 12 and the mixer 18 and, as a result, makes it possible both to obtain a good thermal efficiency and to reduce the amount of energy required (fuel) to its operation, especially at the mixer 18 which maintains a constant temperature of the asphalt 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 amount of bitumen D necessary for the formation of asphalt is also reduced because of the introduction of recycled asphalt in the mixer.
  • the filler introduction mode f also contributes to this bitumen economy because of the improved mixing it provides.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Working-Up Tar And Pitch (AREA)

Claims (7)

  1. Vorrichtung zur Herstellung von Asphaltbeton im kontinuierlichen Verfahren, welche eine Trommel (12), die um ihre Längsachse drehbar gelagert ist, einen Brenner (16) und einen Mischer (18), welcher unter der Trommel (12) derart angeordnet ist, dass die in der Trommel (12) bzw. in dem Mischer (18) zirkulierenden Materialflüsse entgegengesetzt gerichtet sind, umfasst, wobei der Mischer (18) ein rotierendes Mischmittel (182, 183) aufweist, das sich unabhängig von der Trommel (12) dreht, dadurch gekennzeichnet, dass die Vorrichtung eine thermische Hülle (14) umfasst, die einerseits zum Teil um die Trommel (12) herum auf einem Teil von deren Länge ungefähr an der Stelle, wo sich die von dem Brenner (16) erzeugte Flamme befindet, angeordnet ist, und andererseits zum Teil zwischen der Trommel (12) und dem Mischer (18), derart, dass sie eine Verbindung zwischen der Trommel (12) und den Mischer (18) sicherstellt, wobei die Trommel (12) mit dem Mischer (18) über die thermische Hülle (14) kommuniziert.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das rotierende Mischmittel (182, 183) von einer Motorantriebseinheit angetrieben wird, die geeignet ist, es mit mehreren Drehzahlen drehen zu lassen.
  3. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das rotierende Mischmittel eine Anordnung von zwei Wellen (182) ist, die nebeneinander angeordnet und auf ihrem Umfang jeweils mit Schaufeln (183) versehen sind.
  4. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die thermische Hülle (14) Öffnungen (141, 143) aufweist, die es ermöglichen, über Leitungen (140, 142, 144, 180) Produkte direkt in den Mischer (18) einzuführen.
  5. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Mischer (18), in Strömungsrichtung gesehen, einen Eingang für trockene Zuschlagstoffe (A), die von der Trommel (12) stammen, einen Eingang für Bitumen (D), einen Eingang für recycelten Asphaltbeton (B), einen Eingang für Füllmaterial (f) und einen Eingang für Zusatzstoffe (C) aufweist.
  6. Verfahren zur Herstellung von Asphaltbeton im kontinuierlichen Verfahren in einer Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass es darin besteht, der Reihe nach in den Mischer (18) einzuführen: trockene Zuschlagstoffe (A), die von der Trommel (12) stammen, danach Bitumen (D), danach recycelten Asphaltbeton (B) und Füllmaterial (f).
  7. Verfahren zur Herstellung von Asphaltbeton nach Anspruch 6, dadurch gekennzeichnet, dass es darin besteht, außerdem in den Mischer (18), nach dem Füllmaterial (f), solche Zusatzstoffe (C) einzuführen, wie Fremdfüller, Sand, Farbstoffe, Fasern.
EP07020986.1A 2006-10-27 2007-10-26 Vorrichtung zur Herstellung eines Asphaltbetons Active EP1916337B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0609444A FR2907810B1 (fr) 2006-10-27 2006-10-27 Dispositif de preparation d'un beton bitumineux

Publications (2)

Publication Number Publication Date
EP1916337A1 EP1916337A1 (de) 2008-04-30
EP1916337B1 true EP1916337B1 (de) 2017-05-24

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EP07020986.1A Active EP1916337B1 (de) 2006-10-27 2007-10-26 Vorrichtung zur Herstellung eines Asphaltbetons

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EP (1) EP1916337B1 (de)
ES (1) ES2637503T3 (de)
FR (1) FR2907810B1 (de)

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FR2927094B1 (fr) * 2008-02-01 2015-07-17 Eurovia Procede pour fabriquer un enrobe bitumineux avec introduction simultanee du liant et d'une partie des fractions minerales solides dans le melangeur.
CN104452532B (zh) * 2014-11-13 2017-03-15 福建南方路面机械有限公司 可自清洁的再生沥青干燥滚筒及自清洁方法
FR3067371B1 (fr) * 2017-06-09 2021-11-26 Ermont Installation et procede de production d'enrobes
CN107345385A (zh) * 2017-07-27 2017-11-14 北京欧亚机械设备股份有限公司 干燥筒进料装置
CN110700042A (zh) * 2019-11-07 2020-01-17 江苏集萃道路工程技术与装备研究所有限公司 一种集预搅拌强制搅拌于一体的连续式再生滚筒
CN111877088A (zh) * 2020-05-22 2020-11-03 福建省铁拓机械股份有限公司 一种连续式再生沥青混合料生产设备
CN111893839A (zh) * 2020-09-10 2020-11-06 新乡市路康机械有限公司 沥青混合料连续生产运输车

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342125A1 (de) * 1988-05-13 1989-11-15 Ermont. C.M. Vorrichtung und Verfahren zur Aufbereitung von bituminösen Produkten

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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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342125A1 (de) * 1988-05-13 1989-11-15 Ermont. C.M. Vorrichtung und Verfahren zur Aufbereitung von bituminösen Produkten

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Publication number Publication date
EP1916337A1 (de) 2008-04-30
ES2637503T3 (es) 2017-10-13
FR2907810A1 (fr) 2008-05-02
FR2907810B1 (fr) 2008-12-26

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