EP0756615B1 - Invention concerning production of asphaltmix - Google Patents

Invention concerning production of asphaltmix Download PDF

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Publication number
EP0756615B1
EP0756615B1 EP95916901A EP95916901A EP0756615B1 EP 0756615 B1 EP0756615 B1 EP 0756615B1 EP 95916901 A EP95916901 A EP 95916901A EP 95916901 A EP95916901 A EP 95916901A EP 0756615 B1 EP0756615 B1 EP 0756615B1
Authority
EP
European Patent Office
Prior art keywords
filler
fraction
fine fraction
liquid
bituminous
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
EP95916901A
Other languages
German (de)
French (fr)
Other versions
EP0756615A1 (en
Inventor
Karl Gunnar Ohlson
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0756615A1 publication Critical patent/EP0756615A1/en
Application granted granted Critical
Publication of EP0756615B1 publication Critical patent/EP0756615B1/en
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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
    • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1068—Supplying or proportioning the ingredients
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
    • C10C3/00—Working-up pitch, asphalt, bitumen

Definitions

  • the invention relates to a process for production of asphalt mix according to the preamble of enclosed claim 1, as known from EP 0 073 181 A2. Further, the invention relates to an asphalt mix produced therewith.
  • a process for production of asphalt mix that includes at least 1) aggregate divided in a coarse and a fine fraction, 2) filler and 3) flowing bituminous binder wherein the bitumen, the filler and the fine fractions are spread over and by the surface of the flowing coarse fraction in the mixer in one layer opon the other, first binding a layer of bituminous liquid and thereafter, through penetration of the layer of bituminous liquid, binding a layer of filler after which a further layer of the fine fraction material is spread over the layer of filler and thus becomes enclosed through further penetration of the bituminous liquid in a combined suspension where both the filler, the fine fraction and the coarse fraction are part of the closed liquid volume whereby pressure and tensile force on the having are resisted by the hydrostatic function of the continuous bituminous liquid through the skeleton of aggregate particles.
  • the penetration of the bituminous liquid through the filler and the fine fraction develops in one step through spreading, in two layers, the filler and the fine fraction materials over the surface of bituminious liquid, bond to the surface of the flowing coarse fraction in the mixer.
  • the filler is spread in a layer over the layer of bituminous liquid on the surface of the coarse fraction.
  • the fine fraction is spread in a layer over the surface of the coarse fraction, coated by the bituminous liquid that penetrates a layer of filler.
  • the content of fine fraction in mix is determined by the volume of fine fraction materials that can be accommodated in the closed volume of bituminous liquid.
  • the inlets, gates, screws et. are equipped for choice of optimum intervals of time and flow rates for the inflow of the filler and the fine fractions into the mixer to be used for optimizing the distribution of the materials in layers over the flowing coarse fraction at the respective materials discharged into the mixer.
  • the following invention concerning production of asphaltmix is based on the knowledge that a relation exist between two, in principle, different mixing methods, and the change in the influence of the surface area and volume of the aggregate on the physical chemistry of the bituminous liquid in the mixing of asphalt mixes, and that the durability and the climate resistance of the finished products are functions of this existing relation.
  • the major difference in the mixing methods is that the first principle leads to an increased liquid content, in the quantity of particles, in the mixer, while the second principle leads to an increase in the content of particles in the liquid already placed in the mixer.
  • the invention as well as the patent EP A2 0073181 for production of asphalt mix is based on mixing by the second principle.
  • a principle mixing method must be furnished with details in order to be applicable.
  • the invention differs for this reason not in principle from the mixing method in accordance with patent nr EP A2 0073181.
  • the difference is revealed in the details of the principle for application of the invention, determined by the result aimed at. The goal has grown when producing mix with the patented details.
  • the reason for the invention is that at the discharge of the filler in patent nr EP A2 0073181, and other known processes the filler is not spread in a layer over the surface of the bituminous liquid on the flowing coarse fraction, but in the quickest way discharged into the mixer to be distributed and penetrated through forced mixing by agitation of the materials. Further, the fline fraction is added after the filler and the bituminous liquid have developed the suspension, with the result that the fine fraction incalpsulates in the developed suspension of filler. These two details in the patented mixing method have shown to prevent the development of a combined suspension of the filler and the fine fraction.
  • the prerequest for having both filler and fine fraction dispersed in a combined liquid volume is that the liquid penetrates both materials in one step.
  • the materials shall be spread in even layers over the surface of the flowing coarse fraction in the mixer.
  • the inlets are equipped for optimization of interval of time between discharges of the different materials into the mixer and for optimization of rates of flow at spreading, in layers, the filler and the fine fraction over the surface of the coarse fraction in accordance with the invention, to first put a layer of bituminous liquid over the surface of the coarse fraction and then powder the layer of bituminous liquid and, through penetration, bind a layer of filler after which the fine fraction is distributed in a new layer through further penetration of the bituminous liquid, whereby the bituminous liquid through the layers of materials unites the filler, the fine fraction and the coarse fraction in a closed volume of liquid, a condition at which the paved mix resist pressure and strain by the hydrostatic function of the bituminous liquid obtained when the liquid is continuous through the skeleton of the aggregate.
  • Appendix Figure 1b) shows asphalt mix in lack of hydrostatic pressure distribution.
  • the deformation in the specimen of test is governed by the force of gravitation.
  • Figure 1a) shows asphalt mix with hydrostatic pressure distribution and toughness. The continuous resistance against elongation during deformation shows that the bituminous liquid is a closed volume.
  • the invention is a complement to patent nr EP A2, 0073181, that has been developd to secure the properties of the process of mixing obtained when the liquid of mix is a closed volume.
  • bituminous liquid first is distributed on the surface of the coarse fraction, thereafter powdered with filler and then the particles of the fine fraction are distributed over the surface, before the bituminous liquid has broken through the layer of filler, causes that it shall be used not only on bach plants but also on asphalt plants with continuous working mixers and on drum mixers.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Architecture (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Road Paving Structures (AREA)
  • Working-Up Tar And Pitch (AREA)

Description

The invention relates to a process for production of asphalt mix according to the preamble of enclosed claim 1, as known from EP 0 073 181 A2. Further, the invention relates to an asphalt mix produced therewith.
For providing asphalt pavings with a reduced tendency to form tracks and cracks, the process and the asphalt mix having the step or features, respectively, of the independent claims 1 and 4, respectively, is proposed by the invention.
Advantageous embodiments are given in the subclaims.
According to the invention, there is provided a process for production of asphalt mix that includes at least 1) aggregate divided in a coarse and a fine fraction, 2) filler and 3) flowing bituminous binder wherein the bitumen, the filler and the fine fractions are spread over and by the surface of the flowing coarse fraction in the mixer in one layer opon the other, first binding a layer of bituminous liquid and thereafter, through penetration of the layer of bituminous liquid, binding a layer of filler after which a further layer of the fine fraction material is spread over the layer of filler and thus becomes enclosed through further penetration of the bituminous liquid in a combined suspension where both the filler, the fine fraction and the coarse fraction are part of the closed liquid volume whereby pressure and tensile force on the having are resisted by the hydrostatic function of the continuous bituminous liquid through the skeleton of aggregate particles.
The penetration of the bituminous liquid through the filler and the fine fraction develops in one step through spreading, in two layers, the filler and the fine fraction materials over the surface of bituminious liquid, bond to the surface of the flowing coarse fraction in the mixer.
According to the invention, the filler is spread in a layer over the layer of bituminous liquid on the surface of the coarse fraction.
Further, the fine fraction is spread in a layer over the surface of the coarse fraction, coated by the bituminous liquid that penetrates a layer of filler.
According to an advantageous embodiment of the invention, the content of fine fraction in mix is determined by the volume of fine fraction materials that can be accommodated in the closed volume of bituminous liquid.
In a device on the asphalt plant for application of the process where the distribution of the filler and the fine fraction is obtained by the flowing coarse fraction, the inlets, gates, screws et., are equipped for choice of optimum intervals of time and flow rates for the inflow of the filler and the fine fractions into the mixer to be used for optimizing the distribution of the materials in layers over the flowing coarse fraction at the respective materials discharged into the mixer.
The following invention concerning production of asphaltmix is based on the knowledge that a relation exist between two, in principle, different mixing methods, and the change in the influence of the surface area and volume of the aggregate on the physical chemistry of the bituminous liquid in the mixing of asphalt mixes, and that the durability and the climate resistance of the finished products are functions of this existing relation.
The major difference in the mixing methods is that the first principle leads to an increased liquid content, in the quantity of particles, in the mixer, while the second principle leads to an increase in the content of particles in the liquid already placed in the mixer.
The invention, as well as the patent EP A2 0073181 for production of asphalt mix is based on mixing by the second principle. A principle mixing method must be furnished with details in order to be applicable. The invention differs for this reason not in principle from the mixing method in accordance with patent nr EP A2 0073181. The difference is revealed in the details of the principle for application of the invention, determined by the result aimed at. The goal has grown when producing mix with the patented details.
The reason for the invention is that at the discharge of the filler in patent nr EP A2 0073181, and other known processes the filler is not spread in a layer over the surface of the bituminous liquid on the flowing coarse fraction, but in the quickest way discharged into the mixer to be distributed and penetrated through forced mixing by agitation of the materials. Further, the fline fraction is added after the filler and the bituminous liquid have developed the suspension, with the result that the fine fraction incalpsulates in the developed suspension of filler. These two details in the patented mixing method have shown to prevent the development of a combined suspension of the filler and the fine fraction. The prerequest for having both filler and fine fraction dispersed in a combined liquid volume, is that the liquid penetrates both materials in one step. In order that the layer of bituminious liquid shall penetrate both filler and fine fraction, in one step the materials shall be spread in even layers over the surface of the flowing coarse fraction in the mixer. To accomplish this, the inlets are equipped for optimization of interval of time between discharges of the different materials into the mixer and for optimization of rates of flow at spreading, in layers, the filler and the fine fraction over the surface of the coarse fraction in accordance with the invention, to first put a layer of bituminous liquid over the surface of the coarse fraction and then powder the layer of bituminous liquid and, through penetration, bind a layer of filler after which the fine fraction is distributed in a new layer through further penetration of the bituminous liquid, whereby the bituminous liquid through the layers of materials unites the filler, the fine fraction and the coarse fraction in a closed volume of liquid, a condition at which the paved mix resist pressure and strain by the hydrostatic function of the bituminous liquid obtained when the liquid is continuous through the skeleton of the aggregate.
The problem with asphalt pavings is their tendency to form tracks and cracks. When filler and fine fraction both are parts of the closed liquid volume, pressure and tensile stress are distributed by the hydrostatic function of the liquid. The distribution of pressure by the glue phase protects the paving against overload and forming of tracks at high temperatures, and the toughness of the gluephase protects the paving from forming of cracks at low temperatures.
Appendix Figure 1b) shows asphalt mix in lack of hydrostatic pressure distribution. The deformation in the specimen of test is governed by the force of gravitation. Figure 1a) shows asphalt mix with hydrostatic pressure distribution and toughness. The continuous resistance against elongation during deformation shows that the bituminous liquid is a closed volume.
The invention was discovered in use of the patent nr EP A2, 0073181, when it occured that the choice of time intervals has made patent nr EP A2, 0073181 to a borderline case of the invention. Knowledge of optimizing the process has not been available as one has worked in accordance with the hypothesis that the larger volume of the suspension with filler must be developed before the fine fraction can be accomondated in the liquid and, at the same time,with disregard to the demand that the filler must be spread over the flowing surface of bituminous liquid at discharge into the mixer, in the invention obtained by abandoning the uncontrolled discharge into the mixer by the known mixing processes, for a discharge into the mixer by controlled flow rate, in order to obtain an optimized distribution of the filler over the layer of the bituminous liquid. Through the distribution, the filler lead the penetration of the bituminous liquid through the layer of the fine fraction material resulting in that both the filler and the fine fraction become part of the same volume of suspension.
The invention is a complement to patent nr EP A2, 0073181, that has been developd to secure the properties of the process of mixing obtained when the liquid of mix is a closed volume.
The process of the invention, where the bituminous liquid first is distributed on the surface of the coarse fraction, thereafter powdered with filler and then the particles of the fine fraction are distributed over the surface, before the bituminous liquid has broken through the layer of filler, causes that it shall be used not only on bach plants but also on asphalt plants with continuous working mixers and on drum mixers.

Claims (4)

  1. Process for production of an asphalt mix that includes at least 1) aggregate divided into a coarse fraction and a fine fraction, 2) filler and 3) flowing bituminous binder, characterised in that the bitumen, the filler and the fine fraction are spread over the surface of the coarse fraction by the flow of the coarse fraction in the mixer in one layer upon the other,
    a) first binding a layer of bituminous liquid,
    b) thereafter, through penetration of the layer of bituminous liquid, binding a layer of filler
    c) after which a further layer of the fine fraction material is spread over the layer of filler,
    wherein, instead of an uncontrolled discharge of the filler and the fine fraction into the mixer, the flow rate for discharging the filler is controlled to powder the bituminous liquid which is distributed on the surface of the coarse fraction, and the interval of time between discharging of different materials is so optimized and the flow rate for discharging the fine fraction into the mixer is so controlled, that the bituminous liquid penetrates both the filler and the fine fraction in one step, such that 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 whereby pressure and tensile force on a paving made from the asphalt mix are resisted by the hydrostatic function of the continous bituminous liquid through the skeleton of aggregate particles.
  2. Process according to claim 1,
    characterized in that the fine fraction is spread in a layer over the surface of the coarse fraction, coated by the bituminous liquid that penetrates a layer of filler.
  3. Process according to claim 1,
    characterized in that the content of fine fraction in the mix is determined by the volume of fine fraction materials that can be accomodated in the closed volume of bituminous liquid.
  4. Asphalt mix produced by the process of any of the claims 1 to 3, including at least 1) aggregate divided into a coarse fraction and a fine fraction, 2) filler and 3) flowing bituminous binder,
    wherein the bituminous binder, the filler, and the fine fraction are enclosed in a combined suspension which is spread over the coarse fraction, so that the filler, the fine fraction, and the coarse fraction are parts of a closed liquid volume whereby pressure and tensile force on a paving made from the asphalt mix are resisted by the hydrostatic function of the continous bituminous liquid through the skeleton of aggregate particles.
EP95916901A 1994-04-19 1995-04-18 Invention concerning production of asphaltmix Expired - Lifetime EP0756615B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9401382A SE506581C3 (en) 1994-04-19 1994-04-19 Prior to the production of asphalt pulp
SE9401382 1994-04-19
PCT/SE1995/000416 WO1995028457A1 (en) 1994-04-19 1995-04-18 Invention concerning production of asphaltmix

Publications (2)

Publication Number Publication Date
EP0756615A1 EP0756615A1 (en) 1997-02-05
EP0756615B1 true EP0756615B1 (en) 2001-02-28

Family

ID=20393753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95916901A Expired - Lifetime EP0756615B1 (en) 1994-04-19 1995-04-18 Invention concerning production of asphaltmix

Country Status (6)

Country Link
EP (1) EP0756615B1 (en)
DE (1) DE69520207T2 (en)
DK (1) DK0756615T3 (en)
NO (1) NO311039B1 (en)
SE (1) SE506581C3 (en)
WO (1) WO1995028457A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1408157A2 (en) 2002-10-11 2004-04-14 Karl Gunnar Ohlson Method and device for producing asphalt mix
EP1586706A2 (en) 2004-04-14 2005-10-19 Karl Gunnar Ohlson Method and device for producing asphalt mix

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2476529A3 (en) * 2010-09-28 2014-04-16 Karl Gunnar Ohlson Invention that reduce or eliminate force mixing in production of asphalt pavings and cement concrete

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0073181B1 (en) * 1981-08-25 1985-08-14 Karl Gunnar Ohlson Method and apparatus for making asphalt concrete

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1408157A2 (en) 2002-10-11 2004-04-14 Karl Gunnar Ohlson Method and device for producing asphalt mix
EP1586706A2 (en) 2004-04-14 2005-10-19 Karl Gunnar Ohlson Method and device for producing asphalt mix
EP1586706A3 (en) * 2004-04-14 2006-11-15 Karl Gunnar Ohlson Method and device for producing asphalt mix

Also Published As

Publication number Publication date
EP0756615A1 (en) 1997-02-05
DK0756615T3 (en) 2001-04-30
SE9401382L (en) 1995-10-20
NO964353D0 (en) 1996-10-14
SE9401382D0 (en) 1994-04-19
DE69520207T2 (en) 2001-06-13
NO311039B1 (en) 2001-10-01
SE506581C3 (en) 1998-02-05
NO964353L (en) 1996-10-21
SE506581C2 (en) 1998-01-12
WO1995028457A1 (en) 1995-10-26
DE69520207D1 (en) 2001-04-05

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