EP1586706B1 - Verfahren und Vorrichtung zur Herstellung einer Asphaltmischung - Google Patents

Verfahren und Vorrichtung zur Herstellung einer Asphaltmischung Download PDF

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Publication number
EP1586706B1
EP1586706B1 EP05008075.3A EP05008075A EP1586706B1 EP 1586706 B1 EP1586706 B1 EP 1586706B1 EP 05008075 A EP05008075 A EP 05008075A EP 1586706 B1 EP1586706 B1 EP 1586706B1
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EP
European Patent Office
Prior art keywords
mix
mixer
mixing
asphalt
discharging
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 - Lifetime
Application number
EP05008075.3A
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English (en)
French (fr)
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EP1586706A3 (de
EP1586706A2 (de
Inventor
Karl Gunnar Ohlson
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    • 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
    • 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

Definitions

  • the invention refers to a method for producing asphalt mix as known from EP 0 756 615 B1 .
  • WO 83/00700 describes a method and apparatus for the production of asphalt concrete.
  • 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.
  • 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.
  • EP 1 408 157 A2 discloses European Patent Application 03023201.1 published on the priority date of the present application as EP 1 408 157 A2 and such being state of art according to Art 54(3) EPC, only.
  • the aim of this state of art according to EP 1 408 157 A2 is to find optimal time intervalls and flow rates for production of a closed liquid volume of the mix.
  • An object of the present invention is to improve the mixing methods as known from EP 0 756 615 B1 in such a way that the intervall and flow rates can easier be optimized.
  • a further object of the invention is to increase the viscous resource in batch plant mixed asphalt pavings.
  • the invention especially refers to a start up procedure for starting production of asphalt mix in an asphalt plant. Beginning with such procedure, the optimized intervall and flow rates easily are found by starting with a particular time schedule. The optimized adjustments of an asphalt plant are found easily by producing the mix, testing it with the TOD test and amending the intervall and flow rates, if necessary or advantageous.
  • the coarse fraction and the bitumen are discharged and mixed together in one step.
  • the amount of coarse aggregate and of the bitumen are increasing simultanously.
  • the mixing time for mixing coarse aggregate and bitumen starts at the time starting the discharge of the aggregate and the liquid. So, the effete mixing time starts earlier and can last longer. Since the amount of coarse aggregat and liquid are increasing simultanously, each particle of coarse aggregat will be better covered with liquid so that the closed liquid volume of the whole asphalt mix can be achieved more easily.
  • the effect of the invention is visible by the TOD test. With the invention, one achieves a smoother curve of the deformation versus temperature. The behaviour of a mix produced according to the invention is more like a liquid as compared with Fig. 1 a ) of EP 0 756 615 B1 .
  • the known asphalt product still shows a sharp, sudden fall at a higher temperature.
  • An aspalt product produced by the invention shows a smooth curve without sudden changes or flanks.
  • figure 1 results from a discovery of that the property of viscosity that characterizes the unmixed bituminous liquid, figure 1 refers, is drastically reduced in the known process of mixing, this from lack of relevant time schedule for adding and flow rates of the different fractions of solids at discharge to the mixer.
  • Inertia is a combined function of ductility and cohesion, properties recognized as the resource of durability of the bituminous liquid as the binder of paved mix.
  • One novelty of the invention is the time schedule for entering to the mixer the different fractions of the aggregate and the bituminous liquid of the mix, the mixing times of each fraction entered and the time of emptying the mixer of the ready asphalt mix that is characterized by the viscous resource of the unmixed bituminous liquid.
  • the basic components of asphalt mix are the following:
  • composition of the mixes of an embodiment of the invention differs from the known by that, independent of the type of the mix, the fine fraction and filler, has more or less the same percentage in mix and the different types of the mixes are recognized by the difference in the size of the largest particles of the coarse fraction.
  • FIG. 2 An example of material composition for use with the invention for production of asphalt paving of type surface layer, is shown by figure 2 .
  • a time schedule shows the order of discharge, the intervals between discharge, the rate of flow at discharge and the mixing time between discharge of each component added to the mixer.
  • the production of asphalt paving mix by the shown time schedule results in a paving characterized by the property of the viscosity of the bituminous liquid.
  • the property of viscosity in the mix is shown by test on specimens drilled from the paving.
  • Figure 4a shows a test equipment, and figure 4b ) represents a graph of viscous mix.
  • the time schedule of figure 3 is universal for starting up different make of asphalt plants and will function with all types of mix with the material composition of the invention. Trimming the schedule for adjustment of the respective asphalt plant capacity is allowed, the extent is however limited by the test on the viscous behaviour of the mix.
  • Figure 4 b) refers.
  • the described invention is a technology here described by a time schedule, an example of mix composition, a method for trimming the asphalt plant and a method for testing the asphalt mix. By the method of testing, the limit to which the time schedule can be trimmed is also learned.
  • One embodiment of the invention provides a method for production of asphalt mix depending on a time schedule for entering to the mixer the different fractions of the aggregate and the bituminous liquid of the mix, the mixing times of each fraction entered and the time of emptying the mixer of the ready asphalt mix, this having the effect of the invention of the viscous resource of bituminous liquid, the time schedule being universal for different make of asphalt batch plants for discharges of the components to the mixer to be used when starting production by the invention.
  • the time schedule includes
  • any type of asphalt plant easily can be adjusted to produce asphalt mix with increased viscous behaviour which is testable by TOD test.
  • the time schedule of the invention is universal for starting up production at any asphalt plant.
  • a time schedule to weigh and discharge the material to the mixer can be provided including
  • the apparatus that controls the discharge and mixing times makes those adjustable to the extent allowed for trimming of the plants capacity.
  • An example of a device for carrying out the method has a screw (D) for discharge of the filler into the mixer, wherein the flow rate is adjusted by the change of the revolution/minute of the screw by a frequency converter connected to the motor of the screw.
  • a further example of a device for carrying out the method has a wall fitted in the weigh hopper above the mixer or alternative in the mixer (A), depending on space, the function of this is to prevent the aggregate material from being discharges into area (C) of the mixer where the material flow in the mixer is countercurrent to the flow of the discharged material.
  • the invention results from a discovery that the property of viscosity that characterize the unmixed bituminous liquid is drastically reduced in the known processes of mixing, this from lack of a relevant time schedule for adding, and flow rates of the different fractions of solids at discharge into the mixer.
  • the invention is a technology of mixing the components of the asphalt mix without reduction in the viscous resource of the bituminous liquid.
  • the technology is here described by a time schedule, an example of mix composition, a method for testing the asphalt mix of the viscous resource and devices that control the flow of the components in mix at discharged to the mixer. By the method of testing is also learned the limit to which the time schedule can be trimmed, as to the asphalt plants capacity.
  • the invention is important to the production of asphalt mixes. This as the viscosity of the bituminous liquid is a product of ductility and cohesion, a combination recognized as the resource of durability of the bituminous liquid as the binder of paved mix.

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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)
  • Working-Up Tar And Pitch (AREA)

Claims (7)

  1. Verfahren zum Herstellen einer Asphaltmischung, die einen grobkörnigen Anteil, einen feinkörnigen Anteil, einen Füllstoff und eine bituminöse Flüssigkeit aufweist, umfassend die folgenden Verfahrensschritte in der angegebenen Reihenfolge:
    a) Mischen des grobkörnigen Anteils und der bituminösen Flüssigkeit in einem Mixer,
    b) Entladen des über dem grobkörnigen Anteil und der bituminösen Flüssigkeit zu verteilenden Füllstoffs und
    c) Entladen des feinkörnigen Anteils über dem Füllstoff und Mischen,
    d) Entladen der fertigen Mischung von dem Mixer,
    wobei das Entladen der Anteile derart optimiert ist, dass die Mischung sich wie eine Flüssigkeit in einem Test verhält, bei welchem die Verformung einer Probe aus der Mischung abhängig von der Temperatur der Probe gemessen wird,
    dadurch gekennzeichnet, dass zur Durchführung des Schritts a) der grobkörnige Anteil und das flüssige Bindemittel während einer Zeitdauer gleichzeitig entladen und gemischt werden, und
    dass zum Beginnen der Herstellung einer Asphaltmischung in einer Asphaltfabrik optimierte Intervalle und Fließgeschwindigkeiten ermittelt werden, indem mit einem bestimmten Zeitablaufplan begonnen wird, die Mischung hergestellt wird, mittels zuvor genanntem Test getestet wird, und das Intervall und die Fließgeschwindigkeiten, wenn nötig oder vorteilhaft, geändert werden, bis das hergestellte Asphalterzeugnis in genanntem Test durch eine glatte Verformungskurve gegenüber der Temperatur ohne abrupte Wechsel oder Steigungen eine Viskosereserve zeigt.
  2. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, dass zum Beginnen der Herstellung in einer Asphaltfabrik der folgende Zeitablaufplan im Allgemeinen in unterschiedlichen Asphaltfabriktypen und für verschiedene Mischkompositionen verwendet wird:
    a) Gleichzeitiges Entladen des grobkörnigen Anteils und der bituminösen Flüssigkeit und Mischen während eines ersten Zeitintervalls von 17 Sekunden,
    b) Verteilen des entladenen Füllstoffs während eines zweiten Zeitintervalls von 17 Sekunden,
    c) Entladen und Mischen des feinkörnigen Anteils während eines dritten Zeitintervalls von 18 Sekunden,
    d) Entladen der fertigen Mischung aus dem Mixer.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der Zeitablaufplan anschließend verändert wird, um ein viskoses Verhalten der Mischung zu erzielen und/oder zu optimieren.
  4. Verfahren nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, dass der Zeitablaufplan zur Anpassung an die entsprechende Kapazität der Asphaltfabrik anschließend justiert wird, wobei das Ausmaß der Justierung durch das Testen des viskosen Verhaltens der Mischung begrenzt ist.
  5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Füllstoff und/oder feinkörnige Anteil in einem nach unten gerichteten Materialfluss in den Mixer entladen wird.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass ein Mixer mit einer Mixerwelle verwendet wird, die sich in einer horizontalen Richtung erstreckt und zum Antreiben des Flusses des zu mixenden Materials Schaufeln aufweist, und dass das feinkörnige Material entlang einer Mixerwand, die sich im Wesentlichen parallel zur Mixerwelle erstreckt, entladen wird, während die Schaufeln in einer abwärts gerichteten Richtung rotiert werden.
  7. Verfahren nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, dass ein Mixer mit wenigstens zwei Mixerwellen, die Mixerschaufeln aufweisen, verwendet wird, wobei sich die Wellen und deren Schaufeln in entgegen gesetzten Richtungen drehen, so dass sich die Schaufeln auf der zu dem anderen Schaft benachbarten Seite nach oben bewegen und die Schaufeln, die benachbart zur Wand des Mixers, die sich im Wesentlichen parallel zu den Schäften erstreckt, angeordnet sind, nach unten bewegen.
EP05008075.3A 2004-04-14 2005-04-13 Verfahren und Vorrichtung zur Herstellung einer Asphaltmischung Expired - Lifetime EP1586706B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 200410032986 CN1683715B (zh) 2004-04-14 2004-04-14 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
CN200410032986 2004-04-14

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EP1586706A2 EP1586706A2 (de) 2005-10-19
EP1586706A3 EP1586706A3 (de) 2006-11-15
EP1586706B1 true EP1586706B1 (de) 2013-04-10

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EP05008075.3A Expired - Lifetime EP1586706B1 (de) 2004-04-14 2005-04-13 Verfahren und Vorrichtung zur Herstellung einer Asphaltmischung

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2476529A3 (de) 2010-09-28 2014-04-16 Karl Gunnar Ohlson Erfindung zur Verringerung oder Beseitigung der Kraftmischung bei der Herstellung von Asphaltdecken und Zementbeton

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996000324A1 (en) * 1994-06-27 1996-01-04 Leif Persson Plant I Lomma Ab Method and device for cold mixing of road surfacing material

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394094A (en) * 1964-04-20 1968-07-23 Ind Asphalt Of California Inc Process of preparing a paving composition
EP0073181B1 (de) * 1981-08-25 1985-08-14 Karl Gunnar Ohlson Verfahren und Vorrichtung zum Herstellen von Asphaltbeton
SE506581C3 (sv) * 1994-04-19 1998-02-05 Karl Gunnar Ohlson Foer produktion av asfaltmassor
CN1173813C (zh) * 2002-04-10 2004-11-03 陈启宗 连续式沥青混凝土搅拌设备的冷骨料配料处理方法及装置
SE525421C2 (sv) * 2002-10-11 2005-02-15 Karl Gunnar Ohlson Förfarande för framställning av asfaltmassor samt anordning för dess genomförande

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996000324A1 (en) * 1994-06-27 1996-01-04 Leif Persson Plant I Lomma Ab Method and device for cold mixing of road surfacing material

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Publication number Publication date
CN1683715A (zh) 2005-10-19
EP1586706A3 (de) 2006-11-15
EP1586706A2 (de) 2005-10-19
CN1683715B (zh) 2013-07-17

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