EP1586706A2 - Verfahren und Vorrichtung zur Herstellung einer Asphaltmischung - Google Patents

Verfahren und Vorrichtung zur Herstellung einer Asphaltmischung Download PDF

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Publication number
EP1586706A2
EP1586706A2 EP05008075A EP05008075A EP1586706A2 EP 1586706 A2 EP1586706 A2 EP 1586706A2 EP 05008075 A EP05008075 A EP 05008075A EP 05008075 A EP05008075 A EP 05008075A EP 1586706 A2 EP1586706 A2 EP 1586706A2
Authority
EP
European Patent Office
Prior art keywords
mixer
mix
mixing
filler
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.)
Granted
Application number
EP05008075A
Other languages
English (en)
French (fr)
Other versions
EP1586706A3 (de
EP1586706B1 (de
Inventor
Karl Gunnar Ohlson
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Individual
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Individual
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Publication date
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Publication of EP1586706A2 publication Critical patent/EP1586706A2/de
Publication of EP1586706A3 publication Critical patent/EP1586706A3/de
Application granted granted Critical
Publication of EP1586706B1 publication Critical patent/EP1586706B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • E01C19/1013—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 and a device 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.
  • 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.
  • 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 can be found by starting with a particular time schedule. The optimized adjustments of an asphalt plant can such be 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 can achieve 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.
  • 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.
  • Am embodiment of the invention requires the following mechanical changes to the asphalt plant:
  • 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.

Landscapes

  • 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)
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

Publications (3)

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

Family

ID=34935112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05008075.3A Expired - Lifetime EP1586706B1 (de) 2004-04-14 2005-04-13 Verfahren und Vorrichtung zur Herstellung einer Asphaltmischung

Country Status (2)

Country Link
EP (1) EP1586706B1 (de)
CN (1) CN1683715B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2476529A2 (de) 2010-09-28 2012-07-18 Karl Gunnar Ohlson Erfindung zur Verringerung oder Beseitigung der Kraftmischung bei der Herstellung von Asphaltdecken und Zementbeton

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000700A1 (en) 1981-08-25 1983-03-03 Karl Gunnar Ohlson Method and apparatus for the production of asphalt concrete
EP0756615B1 (de) 1994-04-19 2001-02-28 Karl Gunnar Ohlson Erfindung betreffs der produktion von asphaltgemisch
EP1408157A2 (de) 2002-10-11 2004-04-14 Karl Gunnar Ohlson Verfahren und Vorrichtung zur Herstellung eines Asphaltgemisches

Family Cites Families (3)

* 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
SE502772C2 (sv) * 1994-06-27 1996-01-08 Leif Lennart Persson Sätt och anordning för kallblandning av vägbeläggningsmaterial
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000700A1 (en) 1981-08-25 1983-03-03 Karl Gunnar Ohlson Method and apparatus for the production of asphalt concrete
EP0756615B1 (de) 1994-04-19 2001-02-28 Karl Gunnar Ohlson Erfindung betreffs der produktion von asphaltgemisch
EP1408157A2 (de) 2002-10-11 2004-04-14 Karl Gunnar Ohlson Verfahren und Vorrichtung zur Herstellung eines Asphaltgemisches

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2476529A2 (de) 2010-09-28 2012-07-18 Karl Gunnar Ohlson Erfindung zur Verringerung oder Beseitigung der Kraftmischung bei der Herstellung von Asphaltdecken und Zementbeton

Also Published As

Publication number Publication date
CN1683715A (zh) 2005-10-19
EP1586706A3 (de) 2006-11-15
EP1586706B1 (de) 2013-04-10
CN1683715B (zh) 2013-07-17

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