EP0985768A1 - Procédé et appareil pour le recyclage d'asphalte - Google Patents

Procédé et appareil pour le recyclage d'asphalte Download PDF

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Publication number
EP0985768A1
EP0985768A1 EP98202985A EP98202985A EP0985768A1 EP 0985768 A1 EP0985768 A1 EP 0985768A1 EP 98202985 A EP98202985 A EP 98202985A EP 98202985 A EP98202985 A EP 98202985A EP 0985768 A1 EP0985768 A1 EP 0985768A1
Authority
EP
European Patent Office
Prior art keywords
rap
processing chamber
particulate
heating means
asphalt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98202985A
Other languages
German (de)
English (en)
Inventor
Roger Brookfield
Laurie George Levett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Talbot Technology Ltd Rothamsted Research Station
Original Assignee
Talbot Technology Ltd Rothamsted Research Station
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Talbot Technology Ltd Rothamsted Research Station filed Critical Talbot Technology Ltd Rothamsted Research Station
Priority to EP98202985A priority Critical patent/EP0985768A1/fr
Publication of EP0985768A1 publication Critical patent/EP0985768A1/fr
Withdrawn legal-status Critical Current

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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
    • E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B01F27/701—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers
    • B01F27/703—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers with stirrers rotating at different speeds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
    • B28C5/4282—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport with moving mixing tools in a stationary container
    • B28C5/4293—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport with moving mixing tools in a stationary container with reciprocating or oscillating stirrers
    • 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
    • E01C19/104—Mixing by means of movable members in a non-rotating mixing enclosure, e.g. stirrers

Definitions

  • the present invention relates to a process for recycling an asphalt surface and to apparatus for carrying out such a process.
  • the method and apparatus is particularly applicable, but in no way limited to, the treatment of 100% reclaimed asphalt pavement.
  • Asphalt paved road surfaces typically comprise a mixture of a binder, typically a black, bitumen product, and an aggregate comprising appropriately sized stones and/or gravel.
  • the asphalt mixture is usually laid, compressed and smoothed to provide an asphalt paved road surface.
  • an asphalt paved road surface can deteriorate as a result of a number of factors. For example, seasonal temperature fluctuations can cause the road surface to become brittle and/or cracked. Erosion or compacting of the road bed beneath the road surface may also result in cracking. Moreover, certain of the chemical constituents incorporated in fresh asphalt are gradually lost over time or their properties changed with time, further contributing to brittleness and/or cracking of the road surface. Where concentrated cracking occurs, pieces of pavement may become dislodged. This dislodgement can create traffic hazards, and accelerates the deterioration of adjacent pavement and highway substructure. Even if cracking and the loss of pavement pieces do not occur, the passage of traffic can polish the upper highway surface, and such a surface can be slippery and dangerous.
  • traffic-caused wear can groove, trough, rut and crack a highway surface. Under wet highway conditions, water can collect in these imperfections and set up dangerous vehicle hydro-planing phenomena. Collected water also contributes to the further deterioration of the pavement.
  • PCT/CA 93/00069 (Artec Equipment Company Limited) describes a great deal of the background art and the text thereof is imported herein by reference.
  • This PCT patent application describes a method of re-cycling asphalt in situ involving heating the ruptured asphalt with gas-fired infra-red heaters prior to re-compacting.
  • EP 0440423 (Cyclene Limited) describes an apparatus for the treatment of 100% re-cycled asphalt pavement (RAP).
  • the RAP is first heated using a gas burner followed by down stream treatment with microwave radiation.
  • the re-processing process takes place in a counter-flow rotating drum heater.
  • Heating where stated as mobile, the heating equipment is almost certainly some form of gas heating, butane, propane or possibly gas oil.
  • gas heating has sometimes been employed, other methods have included micro-wave as a heating source.
  • gas fired medium wave infra-red this at the low end of the medium wave spectrum and is probably employed to apply heat directly to the road surface for small scale repair patching operations.
  • the most effective system known to the applicant is produced by Cyclene which uses gas heating to bring the material upto an intermediate temperature of 105 degrees centigrade and then switches over to micro-wave heating to bring the material to the optimum temperature of approximately 150 degrees centigrade.
  • This unit is contained within three standard TRU containers for transport and is capable of producing 100 tonnes of material per hour and typically can convert between 700 and 1000 tonnes per day.
  • the drawbacks of this system are the high cost of micro-wave equipment, typically the cost of the magnetrons for this unit would be in the order of £2.5 million, the life of a magnetron is limited to 5000/6000 hours then they have to be replaced.
  • an apparatus for the manufacture of hot mix asphalt (HMA) from re-cycled asphaltic pavement (RAP) comprising:-
  • Short-wave infra-red heaters have proved significantly more effective at heating through the RAP without over-heating or carbonising the bitumen binder.
  • the short-wave infra-red heaters are electrically powered.
  • the processing chamber further comprises a series of rotatable paddles adapted to both mix the RAP and to progress the mixture along the processing chamber.
  • the paddles are mounted on rotatable shafts, the shafts being in substantially parallel, non-coaxial corresponding end alignment inside the processing chamber, the axis of said shafts being substantially perpendicular to the longitudinal axis of the processing chamber.
  • the paddles can be akin to the paddles on a water wheel or paddle boat and thus provide intimate mixing or the RAP mixture.
  • alternate shafts are adapted to both counter-rotate and co-rotate during different phases of the regenerating process under the control of the operator.
  • the RAP mixture By co-rotating the paddles, the RAP mixture can be made to progress along the process chamber in either direction. By counter-rotating the paddles, the mixture will remain within the process chamber and intimate mixing will take place.
  • the radii swept out by the adjacent rotating paddles overlap one with another.
  • the RAP treatment process of this invention results in the production of high grade asphalt from waste material with very low or no substantial pollution of the air. This is an important consideration when operating in urban areas such as town on city centres.
  • FIGS 1 to 3 illustrate diagramatically the type of apparatus and process involved.
  • Reclaimed asphalt pavement RAP
  • RAP Reclaimed asphalt pavement
  • Material is loaded into the apparatus generally defined as 10 through an inlet hopper 11.
  • the hopper mechanism is of a type known per se and may incorporate any suitable funnelling arrangement and valve features as would be incorporated by a person skilled in the art.
  • the inlet hopper 11 leads to a first end of a processing chamber 12, which according to a first aspect of the invention, this chamber can be of a wide variety of types such as a rotating drum processor.
  • the processing chamber is adapted to intimately mix the RAP during the heating process and to evenly distribute any rejuvenated compound(s) and additional bitumen material. Once completely mixed and heated to the required operating temperature, the material progresses to the exit or second end of the processing chamber and to a discharge hopper generally shown as 14.
  • a heating means (15) is provided either in or associated with a processing chamber.
  • the heating means comprises a battery of short wave infra-red heaters.
  • wave lengths for the infra-red radiation are between 0.9 to 1.2 nm in wave length for short wave radiation and 1.2 to 3.6nm for medium wave radiation.
  • medium wave infra-red emitters can be used.
  • short and medium wave infra-red is a form of dielectric heating and provides a much more acceptable alternative to micro waves.
  • Short wave infra-red emitters are commercially available and a suitable type can be obtained from Heraeus Ltd.
  • the conveying means comprises a series of rotatable paddles much as would be found on a paddle steamer. Typically, these consist of two or more blades or paddles mounted on and displaced from a central shaft.
  • the shafts are mounted substantially parallel to each other transverse to, and along the length of, the processing chamber.
  • the shafts are, in effect, in substantially parallel, non-coaxial corresponding end alignment with their axes substantially perpendicular to the longitudinal axis of the processing chamber.
  • the arcs described by rotation of adjacent paddles overlap. The adjacent paddles are prevented from fouling each other by a gear mechanism used to drive them in harmony.
  • the gear mechanism can be of any conventional type and may comprise any suitable arrangement of motor(s), gears, belts, pulleys, clutches and the like.
  • our innovation which accepts 100% recycled material, we have combined shod-wave and ultra short-wave or for certain application medium wave infra-red emitters.
  • the amount of heat applied can be varied to suit the material to be processed.
  • the innovation can be used for either batch or continuous process.
  • the heating system is mounted above a conveyor system which both transports and mixes the material being heated ensuring the material is evenly heated throughout to the required temperature without degrading the bitumen content. Both the mixing action and transport speed are infinitely variable allowing the processor to accommodate all types of asphalt's and macadam's.
  • the material is fed from a loading hopper into the processor and before it is loaded into a heated storage hopper, the material is passed through a second mixing chamber where if necessary rejuvenator is added to the mix in measured amounts then thoroughly mixed before it is put into the storage hoppers.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Road Paving Machines (AREA)
  • Working-Up Tar And Pitch (AREA)
EP98202985A 1998-09-07 1998-09-07 Procédé et appareil pour le recyclage d'asphalte Withdrawn EP0985768A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98202985A EP0985768A1 (fr) 1998-09-07 1998-09-07 Procédé et appareil pour le recyclage d'asphalte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98202985A EP0985768A1 (fr) 1998-09-07 1998-09-07 Procédé et appareil pour le recyclage d'asphalte

Publications (1)

Publication Number Publication Date
EP0985768A1 true EP0985768A1 (fr) 2000-03-15

Family

ID=8234090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98202985A Withdrawn EP0985768A1 (fr) 1998-09-07 1998-09-07 Procédé et appareil pour le recyclage d'asphalte

Country Status (1)

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EP (1) EP0985768A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012108755A3 (fr) * 2011-02-08 2012-10-04 Villalobos Davila Rodolfo Équipement industriel pour le recyclage de mélanges asphaltiques à chaud
US9022686B2 (en) 2009-12-31 2015-05-05 Heatwurx, Inc. System and method for controlling an asphalt repair apparatus
US9416499B2 (en) 2009-12-31 2016-08-16 Heatwurx, Inc. System and method for sensing and managing pothole location and pothole characteristics
WO2017184958A1 (fr) * 2016-04-22 2017-10-26 Crupi Francesco A Système et procédé de recyclage d'asphalte par chauffage par rayonnement et par convection et par culbutage en douceur simultané
US10294616B2 (en) 2016-04-22 2019-05-21 Francesco A. Crupi System and method for recycling asphalt using induction heating

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE863470C (de) * 1951-10-21 1953-01-19 Haendle & Soehne Karl Mischer zur Aufbereitung von Tonerde od. dgl.
US2626875A (en) * 1944-05-24 1953-01-27 Kenneth E Mcconnaughay Process of preparing a paving composition
US3778032A (en) * 1972-03-01 1973-12-11 Quaker Oats Co Candy mixer
GB2115711A (en) * 1982-01-27 1983-09-14 Ben Travis A highway asphalt and coated a recycling machine
EP0146939A2 (fr) * 1983-12-29 1985-07-03 Deutag-Mischwerke GmbH Dispositif et procédé de chauffage d'asphalte concassé
US4797080A (en) * 1985-05-30 1989-01-10 Ika-Maschinenbau Janke & Kunkel Gmbh & Co. Kg Continuous kneading machine
EP0440423A2 (fr) 1990-01-30 1991-08-07 Cyclean, Inc Séchoir à tambour pour le retraitement d'asphalte récupéré
EP0465766A1 (fr) * 1990-07-11 1992-01-15 Heraeus Quarzglas GmbH Radiateur à infrarouge pour surfaces planes
WO1993017185A1 (fr) 1992-02-21 1993-09-02 Mclean Ventures Corporation Procede et appareil pour reutiliser un revetement en asphalte
GB2325176A (en) * 1997-05-03 1998-11-18 Talbot Technology Limited Heating re-cycled asphalt with infra-red during the manufacture of hot mix asphlt

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2626875A (en) * 1944-05-24 1953-01-27 Kenneth E Mcconnaughay Process of preparing a paving composition
DE863470C (de) * 1951-10-21 1953-01-19 Haendle & Soehne Karl Mischer zur Aufbereitung von Tonerde od. dgl.
US3778032A (en) * 1972-03-01 1973-12-11 Quaker Oats Co Candy mixer
GB2115711A (en) * 1982-01-27 1983-09-14 Ben Travis A highway asphalt and coated a recycling machine
EP0146939A2 (fr) * 1983-12-29 1985-07-03 Deutag-Mischwerke GmbH Dispositif et procédé de chauffage d'asphalte concassé
US4797080A (en) * 1985-05-30 1989-01-10 Ika-Maschinenbau Janke & Kunkel Gmbh & Co. Kg Continuous kneading machine
EP0440423A2 (fr) 1990-01-30 1991-08-07 Cyclean, Inc Séchoir à tambour pour le retraitement d'asphalte récupéré
EP0465766A1 (fr) * 1990-07-11 1992-01-15 Heraeus Quarzglas GmbH Radiateur à infrarouge pour surfaces planes
WO1993017185A1 (fr) 1992-02-21 1993-09-02 Mclean Ventures Corporation Procede et appareil pour reutiliser un revetement en asphalte
GB2325176A (en) * 1997-05-03 1998-11-18 Talbot Technology Limited Heating re-cycled asphalt with infra-red during the manufacture of hot mix asphlt

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9022686B2 (en) 2009-12-31 2015-05-05 Heatwurx, Inc. System and method for controlling an asphalt repair apparatus
US9416499B2 (en) 2009-12-31 2016-08-16 Heatwurx, Inc. System and method for sensing and managing pothole location and pothole characteristics
WO2012108755A3 (fr) * 2011-02-08 2012-10-04 Villalobos Davila Rodolfo Équipement industriel pour le recyclage de mélanges asphaltiques à chaud
US9322138B2 (en) 2011-02-08 2016-04-26 Rodolfo Villalobos Davila Industrial equipment for the hot recycling of asphalt mixes
RU2591218C2 (ru) * 2011-02-08 2016-07-20 ДАВИЛА Родолфо ВИЛЛАЛОБОС Промышленная установка для горячего рециклинга асфальтовых смесей
WO2017184958A1 (fr) * 2016-04-22 2017-10-26 Crupi Francesco A Système et procédé de recyclage d'asphalte par chauffage par rayonnement et par convection et par culbutage en douceur simultané
US10294616B2 (en) 2016-04-22 2019-05-21 Francesco A. Crupi System and method for recycling asphalt using induction heating

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