EP0756615B1 - Invention concerning production of asphaltmix - Google Patents
Invention concerning production of asphaltmix Download PDFInfo
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000007788 liquid Substances 0.000 claims description 46
- 239000000945 filler Substances 0.000 claims description 42
- 239000010426 asphalt Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- 239000000725 suspension Substances 0.000 claims description 8
- 230000002706 hydrostatic effect Effects 0.000 claims description 7
- 230000035515 penetration Effects 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 3
- 238000009826 distribution Methods 0.000 description 7
- 238000005457 optimization Methods 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- IJJWOSAXNHWBPR-HUBLWGQQSA-N 5-[(3as,4s,6ar)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-n-(6-hydrazinyl-6-oxohexyl)pentanamide Chemical compound N1C(=O)N[C@@H]2[C@H](CCCCC(=O)NCCCCCC(=O)NN)SC[C@@H]21 IJJWOSAXNHWBPR-HUBLWGQQSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
Images
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.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Architecture (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)
- 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,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.a) first binding a layer of bituminous liquid,b) thereafter, through penetration of the layer of bituminous liquid, binding a layer of fillerc) after which a further layer of the fine fraction material is spread over the layer of filler,
- 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. - 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. - 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.
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)
| 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)
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4579458A (en) * | 1981-08-25 | 1986-04-01 | Ohlson Karl G | Method and apparatus for the production of asphalt concrete |
-
1994
- 1994-04-19 SE SE9401382A patent/SE506581C3/en not_active IP Right Cessation
-
1995
- 1995-04-18 EP EP95916901A patent/EP0756615B1/en not_active Expired - Lifetime
- 1995-04-18 WO PCT/SE1995/000416 patent/WO1995028457A1/en not_active Ceased
- 1995-04-18 DK DK95916901T patent/DK0756615T3/en active
- 1995-04-18 DE DE69520207T patent/DE69520207T2/en not_active Expired - Lifetime
-
1996
- 1996-10-14 NO NO19964353A patent/NO311039B1/en not_active IP Right Cessation
Cited By (3)
| 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 |
|---|---|
| SE506581C2 (en) | 1998-01-12 |
| DE69520207T2 (en) | 2001-06-13 |
| SE9401382D0 (en) | 1994-04-19 |
| DE69520207D1 (en) | 2001-04-05 |
| NO964353L (en) | 1996-10-21 |
| EP0756615A1 (en) | 1997-02-05 |
| DK0756615T3 (en) | 2001-04-30 |
| SE506581C3 (en) | 1998-02-05 |
| SE9401382L (en) | 1995-10-20 |
| WO1995028457A1 (en) | 1995-10-26 |
| NO311039B1 (en) | 2001-10-01 |
| NO964353D0 (en) | 1996-10-14 |
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