EP1408157B1 - Procédé et dispositif pour la production d'une composition d'asphalte - Google Patents

Procédé et dispositif pour la production d'une composition d'asphalte Download PDF

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Publication number
EP1408157B1
EP1408157B1 EP03023201A EP03023201A EP1408157B1 EP 1408157 B1 EP1408157 B1 EP 1408157B1 EP 03023201 A EP03023201 A EP 03023201A EP 03023201 A EP03023201 A EP 03023201A EP 1408157 B1 EP1408157 B1 EP 1408157B1
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EP
European Patent Office
Prior art keywords
fine fraction
mixer
filler
paddles
fraction
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.)
Expired - Fee Related
Application number
EP03023201A
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German (de)
English (en)
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EP1408157A3 (fr
EP1408157A2 (fr
Inventor
Karl Gunnar Ohlson
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Individual
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Publication of EP1408157A3 publication Critical patent/EP1408157A3/fr
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Anticipated expiration legal-status Critical
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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
    • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1068—Supplying or proportioning the ingredients
    • 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 invention relates to a method according to the preamble of claim 1 as known from EP 0 756 615 B1 .
  • a device and a method for producing an asphalt mix are known from DE 576 958 C .
  • the device includes a mixer with a single shaft having paddles to force the mix.
  • the mix is solely consisting of a bituminous liquid and a dust-like filler.
  • the bituminous liquid is filled into the mixer.
  • the dust-like filler is then spread slowly over the liquid in a region that extends along the length of the mixer on a side where the paddles are moving downwards.
  • a special hopper with a controllable flap is provided to discharge the filler into said region so that the filler is slow discharged into a downwardly directed flow of liquid.
  • WO 83/00700 describes a method and apparatus for the production of asphalt concrete.
  • the mix is made from aggregate and bituminous liquid wherein the aggregate is divided into a coarse fraction, a fine fraction and a filler portion.
  • the coarse fraction and the bituminous liquid are mixed, then the filler fraction is added, and last, the fine fraction is added.
  • the apparatus for carrying out such production method is described in detail.
  • the mixing method of WO 83/00700 has been commonly known as "KGO II" mixing method.
  • the known mixing method is characterized by force mixing. The filler is discharged at once, and then the mixing is conducted by the force of mixing paddles.
  • EP 0 756 615 B1 a test equipment and method for testing of asphalt specimens, called TOD test.
  • the specimens are heated and the deformation in the specimens is determined.
  • the deformation over temperature is plotted in a graphic.
  • the curve of a specimen produced by the KGO II mixing method still shows sharp buckles and cracks. This shows the tendency of an asphalt to crack.
  • a new mixing method is given reducing such tendency to crack.
  • the mixing method of EP 0 756 615 B1 - known as KGO III mixing method - is characterized by controlling the flow rate and time intervals for discharging the filler and the fine fraction.
  • the filler discharge is such controlled that the filler is powdered over the liquid distributed over the surface of the coarse fraction.
  • the same technique is used in the KGO III mixing method. By such mixing, the bituminous liquid, the filler and the fine fraction material becomes enclosed in a combined suspension where the filler, the fine fraction and the coarse fraction are parts of a closed liquid volume. This condition is testable by the TOD-test. The flow rate and the time intervals for discharging the filler and the fine fraction are controlled in such a way that the closed liquid volume is established.
  • the object of the invention is to improve an mixing method according to the preamble of claim 1 in such way that the time intervals and flow rates can be easier optimised to develop the closed liquid volume and that the production of an asphalt mix with still further reduced tendency to crack is producible.
  • the fine fraction is discharged into a downwardly directed material flow in the mixer comprising at least two shafts rotating in opposite directions.
  • the invention shall be used in all production by mixing methods where the mix of coarse fraction and the bitumen are added to the mixer before the filler and the fine fraction are admixed.
  • the method refers to the Swedish patent no. 506 581 from 1994-04-19 , and the corresponding EP 0 756 615 B1 , respectively.
  • the invention shows the exact position for discharge of the filler and the fine fraction to the mixer of the asphalt plant that produces suspension asphalt mixes for road paving.
  • suspension asphalt mixes the bitumen, the filler, and the fine fraction particles are permanently bound to the surface area of the coarse fraction particles.
  • Asphalt plants that lack the invention produces sedimentary asphalt mixes which segregate shown by that the fine fraction material in the paving is more or less diverted from the coarse fraction. This can be verified, for example, by the TOD test.
  • Suspension in asphalt mix is formed from the filler material where the main portion is smaller than, for example, 0.074 mm.
  • the suspension also includes the fine fraction of the aggregate that normally is smaller than size, for example, 4 mm.
  • the coarse fraction consists of particles larger than the particles of the fine fraction. The suspension is developed on the surface of the coarse fraction aggregates.
  • the filler material is spread in the bituminous liquid by the flow in the mixer, in penetrable thickness over the films of liquid already developed on the surface area of the coarse fraction.
  • the distribution is obtained through choice of time intervals between adding the components and through control of the flow rates when spreading the material over the flow of the coarse fraction in the mixer.
  • the production by the KGO III (as known from EP 0 756 615 B1 ) is called "Flow Mixing".
  • One reason for the present invention is the discovery of that the filler material and the fine fraction have different requirements for being mixed by the flow.
  • the reason for this is that the quantity of fine fraction material is a number of times larger than the quantity of the filler.
  • the invention is to be used in production of asphalt mix where the coarse fraction and the bitumen liquid are mixed before the addition of the filler and the fine fraction material as in the SE patent no. 506 581 .
  • the fine fraction material is discharged along the mixers wall that is parallel to the shaft of the mixer in order to create an excessive pressure in the material in the mixer, and gravitation force that increases the rate of flow relative to the rate of rotation of the paddles, which lessens the work of the paddles in the materials whereby the coatings of the suspension develop the mix into a structure that remains permanent until the mix is paved.
  • the asphalt mixers downwards directed material flow is loaded with the fine fraction material in order to increase the rate of flow of the material in the mixer in relation to the rate of rotation of the paddles by the gravitation force of the fine fraction material.
  • the load on the material stream increases the rate of flow in the mixer by the equalization of high pressure in the loaded zone and the low pressure in the unloaded zone. This is possible, since the mixed materials in the mixer behave like a liquid during the flow mixing method.
  • a further advantage is the increase in the flow rate in the mixer in relation to the rate of rotation of the paddles and that this lessens the paddle work and shear in the mix.
  • the method for production suspension asphalt mix by change from force mixing to flow mixing is characterized by admixing the bituminous liquid and the coarse fraction of mix to make the mix flow like a liquid to which flow the filler, normally particles smaller than about 0.074 mm, is flow mixed by adding at a slow flow rate whereafter the fine fraction material with particles normally smaller than about 4 mm (and greater as the filler particles) is flow mixed by spreading of the material over paddles or the like mixing tools in a zone where the flow is downwards, this creating an excessive pressure in the material by gravitation force and position energy. This increases the rate of flow relative to the speed of rotation of the paddles, and by this, lessens the shear force of the mixing tools in the mixer whereby the coatings of the suspension on the surface of the coarse fraction develops the mix into suspension.
  • the downwards stream in the mixer is loaded, especially with the fine fraction material, as to produce a levelling out of the fluid mix, by this increasing the flow rate of the stream in the mixer in relation to the speed of rotation of the paddles.
  • the paddle work in the mix is reduced by spreading the fine fraction material over the mixer's paddles of the downwards flow.
  • An advantageous embodiment of a device for carrying out the method in accordance with the invention has a plate or a drum that guide the inflow of material to the mixers wall, parallel to the shafts of the mixer, in order to connect and to load the downwards flowing material stream for spreading to the other parts of the mixer not loaded with the fine fraction.
  • the paddles in the downwardly flowing stream are loaded with the inflow of material for spreading the fluid mix to the lower part of the mixer.
  • an asphalt mix is produced as described in EP 0 756 615 B1 .
  • the figures show a mixer used in the preferred embodiment.
  • the mixer 10 has a mixer body 11, having vertical side walls 12, 13 and end walls 14, 15. There is a bottom 17, comprising two portions 18 which are arcuate in cross section and which are connected together adjacent the longitudinal centre of the mixer body 11.
  • Means for mixing materials within the mixer body 11 comprises a pair of shafts 21 and 24 which are supported adjacent the ends by suitable gearings 25.
  • the shafts 21, 24 are simultaneously rotated by means of an electric motor 20 and suitable gearing 26. The direction of rotation is shown by arrows 27, 28.
  • the shafts 21, 24 are on axes from which the radii of the bottom portions 18 extend as best shown in fig. 2 , and each shaft 21, 24 is provided with a plurality of mixing tools.
  • paddles 30 are used which are connected with the shafts 21, 24 by means of arms 31.
  • the paddles 30 are moving upwards in a center portion of the mixing body 11, as shown by arrow B. Near the side walls 12, 13, which extend parallel to the shafts 21, 24, the paddles 30 are moving downwards.
  • the coarse fraction, the filler fraction and the fine fraction are discharged by a discharging means, generally indicated by D.
  • Said discharging means D has an opening 42 closable by a closing means, indicated E. Further details for providing the aggregate are not shown, but known in the art, see for example WO 83/00700 .
  • the discharging means D has a guiding means C which leads the discharged materials away from the upwards directed zone B to a zone A2 or A1, alternatively, where the flow in the mixer is directed downwards.
  • the fine fraction guiding means C for guiding the fine fraction into zone A2 has a plate 44 which directs the inflow of material 50 to the sidewall 12.
  • the flow of the fine fraction material will produce an overload of the material by which the gravity of the material and the nature of the fluid to flow from high to low areas increases the flow rate of the fine fraction in to other parts of the mixer that are less loaded.
  • the mixer 10 has three zones, one (B) in which the flow of materials is directed upwards, and two (A1 and A2) in which the flow is directed downwards.
  • Fig. 2 shows an example of a mechanical solution by said plate 44, mounted to steer the flow of the fine fraction to the place of discharge in accordance with the invention.
  • the plate 44 can be installed permanently.
  • the guiding means can be made movable for only directing the fine fraction (or the filler and the fine fraction) into the downwardly directed material flow.
  • the force of gravitation is the result of the position energy of the material in zone A1 (alternative zone A2).
  • the levelling energy is a result of over loading, this caused by the inlet of the fine fraction in zone A1 or A2.
  • Example of such force is a container divided in half by a wall. If filled with water on the one side of the wall and a valve is opened at the bottom of the defining wall, the water from the filled side will flow to the other side until the water is levelled in the two parts.
  • the invention exposes a combination of three forces for reducing the shear of the paddles, 1) the energy of the flow, 2) the force of gravitation, and 3) the position energy. As long as the mix is fluid, the materials are mixed by the flow. If the admixing of the fine fraction divert from the invention, the mixing process will change from flow mixing to force mixing and the mix consistency from fluid to clogged.
  • the invention is used on different types of asphalt plants for production of suspension asphalt. Without the invention, many plants fail to produce suspension asphalt paving.
  • the invention develops a liquid mixing process. There is no shear in liquids. This is one reason for that the suspension develops on the surface of the coarse fraction and remains there until the mix is paved.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Road Paving Machines (AREA)

Claims (6)

  1. Procédé pour fabriquer un mélange d'asphalte contenant une fraction grossière, une fraction fine, une charge et un liant bitumineux, procédé comprenant les étapes suivantes dans l'ordre ci-après :
    a) on mélange la fraction grossière et le liant liquide dans un mélangeur (10), et
    b) on décharge la charge suivant un débit contrôlé pour poudrer le liant liquide distribué à la surface de la fraction grossière avec la charge, et
    c) on étale la fraction fine sur la couche de charge,
    procédé selon lequel
    la sortie de la charge et de la fraction fine est contrôlée pour que la charge et la fraction fine soient enrobées dans la suspension combinée dans laquelle la charge, la fraction fine et la fraction grossière font partie d'un volume de liquide fermé,
    procédé caractérisé en ce que
    on utilise un mélangeur (10) ayant au moins deux axes (21, 24) portant des pales de mélangeur (30),
    les axes (21, 24) et les pales (30) tournant en sens opposé de façon que les pales (30), sur le côté proche de l'autre axe, remontent et que les pales (30) proches de la paroi (12, 13) du mélangeur (10) descendent, la paroi (12, 13) s'étendant pratiquement parallèlement aux axes (21, 24), et
    on évacue la fraction fine dans la direction descendante du flux de matière dans le mélangeur (10).
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'
    on évacue la matière de la fraction fine suivant une paroi (12, 13) du mélangeur, cette paroi s'étendant sensiblement parallèlement à l'axe (21, 24), les pales (30) tournant dans le sens descendant.
  3. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le débit de sortie de la fraction fine est supérieur au débit de sortie de la charge et/ou la fraction fine est sortie en un temps plus court que la sortie de la charge.
  4. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'
    on décharge la fraction fine de façon que la matière de la fraction fine soit agrégée au dessus du niveau de liquide du flux de mélange descendant.
  5. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la fraction fine est évacuée dans le flux de mélange descendant à la vitesse du flux de mélange.
  6. Dispositif pour fabriquer un mélange d'asphalte et pour effectuer le procédé selon l'une quelconque des revendications précédentes comportant un mélangeur (10) et un moyen de sortie (D) pour décharger la matière à mélanger dans le mélangeur (10),
    le moyen de sortie (D) ayant un moyen de séparation de la fraction fine pour séparer la fraction fine de la fraction grossière et de la charge, caractérisé en ce que
    le mélangeur (10) a au moins deux axes (21, 24) portant des pales (30), des axes (21, 24) et des pales (30) tournant en sens opposé de sorte que les pales (30) du côté proche de l'autre axe remontent et que les pales (30) proches de la paroi (12, 13) du mélangeur (10) descendent, la paroi (12, 13) s'étendant pratiquement parallèlement aux axes (21, 24), et
    le moyen de sortie (D) conduit la fraction fine par un moyen de guidage (C) vers l'emplacement (A2) du mélangeur (10) là où descendent les matières à mélanger.
EP03023201A 2002-10-11 2003-10-13 Procédé et dispositif pour la production d'une composition d'asphalte Expired - Fee Related EP1408157B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0203057A SE525421C2 (sv) 2002-10-11 2002-10-11 Förfarande för framställning av asfaltmassor samt anordning för dess genomförande
SE0203057 2002-10-11

Publications (3)

Publication Number Publication Date
EP1408157A2 EP1408157A2 (fr) 2004-04-14
EP1408157A3 EP1408157A3 (fr) 2005-01-05
EP1408157B1 true EP1408157B1 (fr) 2011-01-05

Family

ID=20289283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03023201A Expired - Fee Related EP1408157B1 (fr) 2002-10-11 2003-10-13 Procédé et dispositif pour la production d'une composition d'asphalte

Country Status (3)

Country Link
EP (1) EP1408157B1 (fr)
DE (1) DE60335593D1 (fr)
SE (1) SE525421C2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1683715B (zh) 2004-04-14 2013-07-17 卡尔·根纳·奥尔森 增加由间歇操作装置混合的沥青铺路料粘度的方法和设备
SE532658C2 (sv) * 2008-07-21 2010-03-09 Ncc Roads Ab Metod för beredning av en asfaltmassa
FR2944811B1 (fr) 2009-04-22 2015-04-17 Colas Sa Procede de preparation d'un enrobe a chaud permettant d'obtenir des enrobes comprenant une teneur reduite en liant
EP2476529A3 (fr) * 2010-09-28 2014-04-16 Karl Gunnar Ohlson Invention qui réduit ou élimine la force de mélange dans la production de revêtement d'asphalte et de béton au ciment
CN102501289B (zh) * 2011-11-03 2014-09-03 湖州南浔振建机电成套设备有限公司 一种木屑搅拌机
EP3482829B1 (fr) 2013-05-22 2020-08-05 Waister AS Dispositif permettant de fluidiser au moins une substance
NO339255B1 (no) 2013-05-22 2016-11-21 Multivector As Anordning for virvling av minst ett fragmentert stoff
CN103674655B (zh) * 2013-12-22 2016-03-02 湖南军成科技有限公司 一种沥青样品制备装置及制备方法
CN112663438B (zh) * 2020-12-18 2022-05-31 重庆九橡化大橡胶科技有限责任公司 橡胶沥青碎石混合方法
CN112681064B (zh) * 2020-12-18 2022-05-31 重庆九橡化大橡胶科技有限责任公司 沥青碎石混合系统
CN112663439B (zh) * 2020-12-18 2022-05-31 重庆九橡化大橡胶科技有限责任公司 橡胶沥青混合用装置
CN114405318A (zh) * 2022-01-20 2022-04-29 广西北投交通养护科技集团有限公司 一种智能感应型改性沥青搅拌装置及其使用方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE579958C (de) * 1930-11-07 1933-07-04 Rech S Et De Perfectionnements Vorrichtung zum Herstellen eines homogenen, tunlichst klumpenfreien Gemisches von Teer, Bitumen o. dgl. mit staubfoermigen Fuellstoffen
DE576958C (de) 1931-02-24 1933-05-22 Reinhold Wagner Verfahren zum Loeschen von Koks
WO1983000700A1 (fr) 1981-08-25 1983-03-03 Karl Gunnar Ohlson Procede et dispositif de production de beton asphaltique
SE506581C3 (sv) 1994-04-19 1998-02-05 Karl Gunnar Ohlson Foer produktion av asfaltmassor

Also Published As

Publication number Publication date
DE60335593D1 (de) 2011-02-17
EP1408157A3 (fr) 2005-01-05
SE525421C2 (sv) 2005-02-15
EP1408157A2 (fr) 2004-04-14
SE0203057D0 (sv) 2002-10-11
SE0203057L (sv) 2004-04-12

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