GB2342943A - Apparatus for mixing and applying a bitumen emulsion-based surfacing composition - Google Patents
Apparatus for mixing and applying a bitumen emulsion-based surfacing composition Download PDFInfo
- Publication number
- GB2342943A GB2342943A GB9823338A GB9823338A GB2342943A GB 2342943 A GB2342943 A GB 2342943A GB 9823338 A GB9823338 A GB 9823338A GB 9823338 A GB9823338 A GB 9823338A GB 2342943 A GB2342943 A GB 2342943A
- Authority
- GB
- United Kingdom
- Prior art keywords
- surfacing
- bitumen emulsion
- composition
- mixing
- laying box
- 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
Links
- 239000010426 asphalt Substances 0.000 title claims abstract description 87
- 239000000839 emulsion Substances 0.000 title claims abstract description 72
- 239000000203 mixture Substances 0.000 title claims abstract description 53
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 125000002091 cationic group Chemical group 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 230000008021 deposition Effects 0.000 abstract description 8
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 125000000129 anionic group Chemical group 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B17/00—Methods preventing fouling
- B08B17/02—Preventing deposition of fouling or of dust
-
- 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
-
- 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
- E01C19/46—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 and placing the materials, e.g. slurry seals
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Machines (AREA)
- Road Paving Structures (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
A surfacing vehicle for mixing and applying to a substrate a bitumen emulsion-based surfacing composition, comprises a mixing unit for mixing together bitumen emulsion and aggregate to form the surfacing composition, a laying box for applying the surfacing composition, by trailing application, to the substrate, and means for electrically charging the surfaces of the mixing unit and/or laying box which, in use, contact the surfacing composition, with an electrical charge of the same polarity as the charge carried by the bitumen emulsion. By virtue of the electrical charge applied to the surfaces of the mixing unit and/or laying box, deposition of bitumen on those surfaces can be prevented, or at least significantly reduced.
Description
2342943 MIXING AND SURFACING APPARATUS
Field of the Invention
The present invention relates to surfacing processes, in particular road-surfacing, involving the use of bitumenbased surfacing materials. More specifically, the present invention relates to apparatus for mixing bitumen emulsion and polymer-modified bitumen emulsion-based surfacing materials, and for applying such materials to the surface of a substrate, for example a road. Background to the Invention slurries comprising polymer-modified bitumen emulsion and graded aggregates, commonly referred to as microasphalts, have widespread use in road surfacing. Such slurries typically also comprise a filler, cement and water in addition to that contained in the bitumen emulsion. Microasphalts are typically mixed at the point of application, although they may be mixed off-site, either by a batching process or by using a continuous flow mixing and laying machine, and are applied to road surfaces by spreading or screeding.
The repeated contact of bitumen emulsion with metal surfaces in the mixing and/or laying apparatus results in deposition of bitumen on those surfaces. This reduces the effectiveness of the mixing and laying operations, and consequently operations must be interrupted regularly to remove the deposited bitumen, resulting in a significant reduction in productivity.
Removal of the deposited bitumen is typically achieved, slowly, through the use of high pressure water jets or, when deposition is more severe, by burning off the bitumen. The latter method has the added disadvantage that it can cause damage to the mixing and laying apparatus, thereby reducing the life of that apparatus.
2 Sumnary of the Invention It has now been found that deposition of bitumen can be prevented, or at least significantly reduced, by applying to the metal surfaces of the mixing and/or laying apparatus that contacts the bitumen emulsion in use, an electrical charge of the same polarity as the charge carried by the bitumen emulsion. If any bitumen is deposited on these surfaces, it is much easier to remove than in the currently operated processes.
Bitumen emulsions used in surfacing operations tend to be cationic in nature, and therefore positively charged, i.e. the bitumen droplets suspended in the emulsion have electropositive charges. These charged droplets repel each other, conferring stability on the emulsion as a whole.
Accordingly-, these droplets are also repelled by an electropositive charge applied to the metal surfaces of mixing and/or laying apparatus, reducing deposition thereon of bitumen from the emulsion.
Less frequently, an anionic bitumen emulsion may be mixed with aggregate for road surfacing. In this case, use of an electronegative charge on the surfaces of the mixing and/or laying apparatus will effectively prevent deposition thereon of bitumen from the anionic emulsion.
According to one aspect of the present invention, therefore, a surfacing vehicle for mixing and applying to a substrate a bitumen emulsion-based surfacing composition comprises a mixing unit for mixing together bitumen emulsion and aggregate to form the surfacing composition, a laying box for applying the surfacing composition, by trailing application, to a substrate, and means for electrically charging surfaces of the mixing unit and/or laying box which, in use, contact the surfacing composition, with an electrical charge of the same polarity as the charge carried by the bitumen emulsion.
The principle upon which the present invention is based may be applied to mixing and/or laying apparatus utilised separately, and to other bitumen emulsion- 3 contacting parts in a combined mixing and laying apparatus. According to a further aspect of the present invention, a method of surfacing a substrate, preferably a road, with a bitumen emulsion-based surfacing composition comprising a bitumen emulsion and aggregate, comprises mixing together the bitumen emulsion and aggregate in a mixing unit having surfaces which are electrically charged with an electrical charge of the same polarity as the charge carried by the bitumen emulsion, so as to repel the bitumen enulsion-based surfacing composition therefrom, and applying the surfacing composition to a substrate by trailing application from a laying box, wherein preferably the surfaces of the laying box are charged with an electrical charge of the same polarity as the charge carried by the bitumen emulsion, so as to repel the bitumen emulsion- based surfacing composition therefrom.
Description.-,of the Invention
In the context of the present Application, all references to bitumen emulsion include bitumen emulsions which are polymer-Tnodified. Furthermore, when, for example reference is made to a cationic bitumen emulsion-based surfacing composition this means a surfacing composition based upon a cationic bitumen emulsion.
Naturally, in order to apply an electrical charge to the b i tumencontacting surfaces of mixing and/or laying apparatus, the surfaces of such apparatus must comprise electrical ly-conductive material, usually a metal, such as steel or aluminium. This is conventional in the field.
An electrical charge can be applied to these surfaces by simply making an electrical connection, for example through a wire, between the surfaces to be protected and a power supply. In the case of stand-alone mixing apparatus or a combined mixing and laying apparatus the surfaces to be charged may be electrically-connected to the main power supply of that apparatus. In the case of a mixing and laying vehicle, it is preferred that the surfaces to be 4 protected are electrical ly-connected to the appropriatelycharged terminal of the battery of the vehicle.
It is essential that the metal surfaces to be protected from bitumen deposition are isolated electrically both from earth and other metal surfaces in the apparatus.
This is achieved, simply, by interposing insulating material between the surfaces to be charged and earth and other metallic surfaces. Suitable insulating materials include rubber and plastic materials.
The surfaces to be protected may comprise only the inner walls of the mixing and/or laying apparatus. However, if, as is conventional, the mixing and/or laying apparatus includes paddles and/or augers whose surfaces comprise electrical ly-conductive material, an electrical charge may also be applied to their surfaces, to prevent bitumen deposition thereon.
As mentioned above, the present invention may be applied to stand-alone mixing apparatus, for example footway slurry mixers and cold mix plants, which may be static or mobile. The invention is particularly beneficial, however, when applied to mixing and laying vehicles, which typically comprise hoppers, containing aggregate and other materials, for example fillers, fibres, etc., to be mixed with a bitumen emulsion from an on-board tank, a mixing unit where the aggregates and bitumen emulsion are mixed, and a laying box from which the resultant surface composition is applied, by trailing application, to the surface of a substrate, usually a road. Vehicles of this type normally utilise a strike plate or screed plate to control the depth of surfacing composition applied from the laying box to the surface of the substrate. If desired, an electrical charge may also be applied to the strike plate or screed plate.
The present invention may also be applied solely to a laying box, or to other isolated parts of a mixing and laying vehicle which, in use, come into contact with bitumen emulsion, or bitumen-coated aggregate.
The present invention may also be applied to static and mobile bitumen emulsion storage tanks. Tanks f or storing cationic bitumen emulsions should be charged positively, and tanks for storing anionic bitumen emulsions should be charged negatively.
6
Claims (15)
1. A surfacing vehicle for nixing and applying to a substrate a bitumen emulsion-based surfacing composition, the vehicle comprising a mixing unit for mixing together bitumen emulsion and aggregate to form the surfacing composition, a laying box for applying the surfacing composition, by trailing application, to the substrate, and means for electrically charging the surfaces of the mixing unit and/or laying box which, in use, contact the surfacing composition, with an electrical charge of the same polarity as the charge carried by the bitumen emulsion. 15
2. A surfacing vehicle according to claim 1, for mixing and applying a cationic bitumen emulsion-based surfacing composition, wherein the charging means applies an electropositive charge to the surfaces of the mixing unit and/or laying box.
3. A surfacing vehicle according to any preceding claim, wherein the charging means charges the surfaces of both the mixing unit and the laying box.
4. A surfacing vehicle according to any preceding claim, wherein the laying box comprises walls and at least one paddle and/or auger therebetween, and the charging means charges both the surfaces of the walls and the at least one paddle and/or auger.
5. A surfacing vehicle according to any preceding claim, which further comprises a strike plate for controlling the depth of the surfacing composition applied from the laying box to the substrate, and wherein the charging means additionally charges the strike plate.
7
6. A surfacing vehicle according to any preceding claim, wherein the surfaces to be charged by the charging means are electrical ly-insulated from other metallic parts of the vehicle.
7. A surfacing vehicle according to any preceding claim, which is powered by a battery which is electricallyconnected, through an appropr i ate lycharged terminal, to the surfaces to be charged, and which comprises the charging means.
8. A surfacing vehicle according to any preceding claim, which is a roadsurfacing vehicle.
9. Apparatus for mixing a bitumen emulsion-based surfacing composition, comprising a mixing unit for mixing together bitumen emulsion and aggregate to form the surfacing composition, and means for electrically charging the surfaces of the mixing unit which, in use, contact the surfacing composition, with an electrical charge of the same polarity as the charge carried by the bitumen emulsion.
10. Apparatus according to claim 10, for mixing a cationic bitumen emulsion-based surfacing composition, wherein the charging means applies an electropositive charge to the surfaces of the mixing unit.
11. A laying box suitable for use with a surfacing vehicle, by means of which a bitumen-based surfacing composition is applied to a surface by trailing application, and which comprises within the walls of the laying box at least one paddle and/or auger, and means for charging the walls and/or at least one paddle and/or auger with an electrical charge of the same polarity as the charge carried by the bitumen emulsion.
8
12. A laying box according to claim 13, for applying a cationic bitumen emulsion-based surfacing composition, wherein the charging means applies an electropositive charge to the walls of the laying box and/or the at least one paddle and/or auger.
13. A method of surfacing a substrate, preferably a road, with a bitumenbased surfacing composition comprising a bitumen emulsion and aggregate, the method comprising mixing together the bitumen emulsion and aggregate in a mixing unit having surfaces which are electrically charged with an electrical charge of the same polarity as the charge carried by the bitumen emulsion, so as to repel the bitumen emulsion-based surfacing composition therefrom, and applying the surfacing composition to a substrate by trailing application from a laying box, wherein preferably the surfaces of the laying box are charged with an electrical charge of the same polarity as the charge carried by the bitumen emulsion, so as to repel the bitumen emulsion- based surfacing composition therefrom.
14. A method of surfacing a substrate according to claim 13 with a cationic bitumen emulsion-based surfacing composition, wherein the surfaces of the mixing unit, and preferably, the laying box, are electropositively charged.
15. A method of surfacing a substrate according to claim 14 with a cationic bitumen emulsion-based surfacing composition, wherein the surfaces of the mixing unit, and preferably, the laying box, are electropositively charged.
15. A bitumen emulsion storage tank having metallic inner walls and means for charging the walls with an electrical charge of the same polarity as the charge carried by the bitumen emulsion.
16. A storage tank according to claim 15, wherein the charging means applies an electropositive charge to the inner walls of the tank.
9 17. A storage tank according to claim 16, which contains a cationic bitumen emulsion.
\0' Amendments to the claims have been filed as follows 1. A surfacing vehicle for mixing and applying to a substrate a bitumen emulsion-based surfacing composition, the vehicle comprising a mixing unit for mixing together bitumen emulsion and aggregate to form the surfacing composition, a laying box for applying the surfacing composition, by trailing application, to the substrate, and means for electrically charging the surfaces of the mixing unit and/or laying box which, in use, contact the surfacing composition, with an electrical charge of the same polarity as the charge carried by the bitumen emulsion.
2. A surfacing vehicle according to claim 1, for mixing and applying a cationic bitumen emulsion-based surfacing composition, wherein the charging means applies an electropositive charge to the surfaces of the mixing unit and/or laying box.
3. A surfacing vehicle according to claim 1 or claim 2, for mixing and applying a cationic bitumen emulsion-based surfacing composition, wherein the charging means applies an electropositive charge to the surfaces of the laying box.
4. A surfacing vehicle according to claim 3, wherein the laying box comprises walls and at least one paddle and/or auger therebetween, and the charging means charges both the surfaces of the walls and the at least one paddle and/or auger.
5. A surfacing vehicle according to any preceding claim, wherein the charging means charges the surfaces of both the mixing unit and the laying box.
d 6. A surfacing vehicle according to any preceding claim, which further comprises a strike plate for controlling the depth of the surfacing composition applied from the laying box to the substrate, and wherein the charging means additionally charges the strike plate.
7. A surfacing vehicle according to any preceding claim, wherein the surfaces to be charged by the charging means are electrical ly- insulated from other metallic parts of the vehicle.
S., A surfacing vehicle according to any preceding claim, which is powered by a battery which is electricallyconnected, through an appropriately-charged terminal, to the surfaces to be charged, and which comprises the charging means. 9. A surfacing vehicle according to any preceding claim, which is a road-surfacing vehicle. 20 10. Apparatus for mixing a bitumen emulsion-based surfacing composition, comprising a mixing unit for mixing together bitumen emulsion and aggregate to form the surfacing composition, and 25 means for electrically charging the surfaces of the mixing unit which, in usef contact the surfacing composition, with an electrical charge of the same polarity as the charge carried by the bitumen emulsion.
11. Apparatus according to claim 10, for mixing a cationic bitumen emulsion-based surfacing composition, wherein the charging means applies an electropositive charge to the surfaces of the mixing unit.
12. A laying box, when used with a surfacing vehicle, by means of which a bitumen-based surfacing composition is applied to a surface by trailing application, and which I - comprises within the walls of the laying box at least one paddle and/or auger, and means f or charging the walls and/or at least one paddle and/or auger with an electrical charge of the same polarity as the charge carried by the bitumen emulsion.
13. A laying box according to claim 12, f or applying a cationic bitumen emulsion-based surfacing composition, wherein the charging means applies an electropositive charge to the walls of the laying box and/or the at least one paddle and/or auger.
14. A method of surfacing a substrate, preferably a road, with a bitumenbased surf acing composition comprising a bitumen emulsion and aggregate, the method comprising mixing together the bitumen emulsion and aggregate in a mixing unit having surfaces which are electrically charged with an electrical charge of the same polarity as the charge carried by the bitumen emulsion, so as to repel the bitumen emulsion-based surfacing composition therefrom, and applying the surfacing composition to a substrate by trailing application from a laying box, wherein preferably the surfaces of the laying box are charged with an electrical charge of the same polarity as the charge carried by the bitumen emulsion, so as to repel the bitumen emulsion-based surfacing composition therefrom.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9823338A GB2342943B (en) | 1998-10-23 | 1998-10-23 | Mixing and surfacing apparatus |
| SK1445-99A SK144599A3 (en) | 1998-10-23 | 1999-10-19 | Mixing and surfacing apparatus |
| CA002286958A CA2286958A1 (en) | 1998-10-23 | 1999-10-20 | Mixing and surfacing apparatus |
| EP99402593A EP0995839A3 (en) | 1998-10-23 | 1999-10-20 | Mixing and surfacing apparatus |
| JP11300986A JP2000129620A (en) | 1998-10-23 | 1999-10-22 | Apparatus for mixing and paving work |
| HU9903784A HUP9903784A3 (en) | 1998-10-23 | 1999-10-22 | Paver car, mixing apparatus and covering method |
| PL99336183A PL336183A1 (en) | 1998-10-23 | 1999-10-22 | Method of and apparatus for mixing and placing a pavement material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9823338A GB2342943B (en) | 1998-10-23 | 1998-10-23 | Mixing and surfacing apparatus |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9823338D0 GB9823338D0 (en) | 1998-12-23 |
| GB2342943A true GB2342943A (en) | 2000-04-26 |
| GB2342943B GB2342943B (en) | 2000-11-01 |
Family
ID=10841249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9823338A Expired - Fee Related GB2342943B (en) | 1998-10-23 | 1998-10-23 | Mixing and surfacing apparatus |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0995839A3 (en) |
| JP (1) | JP2000129620A (en) |
| CA (1) | CA2286958A1 (en) |
| GB (1) | GB2342943B (en) |
| HU (1) | HUP9903784A3 (en) |
| PL (1) | PL336183A1 (en) |
| SK (1) | SK144599A3 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6302805B1 (en) | 1999-11-22 | 2001-10-16 | Penley Sports, Llc | Golf club shaft with improved performance characteristics |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994023129A1 (en) * | 1993-03-26 | 1994-10-13 | Exxon Research And Engineering Company | Bituminous surface construction |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3301441A (en) * | 1964-11-30 | 1967-01-31 | Teichert & Son Inc A | Asphaltic concrete storage bin |
| FR2663654B1 (en) * | 1990-06-21 | 1992-10-09 | Colas Sa | DEVICE FOR SPREADING A FLUID SUBSTANCE AND MACHINE FOR THE SIMULTANEOUS APPLICATION OF SUCH SUBSTANCE AND COATING OF A PAVEMENT. |
| EP0771910A1 (en) * | 1995-10-17 | 1997-05-07 | Jacques Meunier | Method for producing a composite material for roads |
-
1998
- 1998-10-23 GB GB9823338A patent/GB2342943B/en not_active Expired - Fee Related
-
1999
- 1999-10-19 SK SK1445-99A patent/SK144599A3/en unknown
- 1999-10-20 EP EP99402593A patent/EP0995839A3/en not_active Withdrawn
- 1999-10-20 CA CA002286958A patent/CA2286958A1/en not_active Abandoned
- 1999-10-22 JP JP11300986A patent/JP2000129620A/en active Pending
- 1999-10-22 PL PL99336183A patent/PL336183A1/en not_active Application Discontinuation
- 1999-10-22 HU HU9903784A patent/HUP9903784A3/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994023129A1 (en) * | 1993-03-26 | 1994-10-13 | Exxon Research And Engineering Company | Bituminous surface construction |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2342943B (en) | 2000-11-01 |
| CA2286958A1 (en) | 2000-04-23 |
| EP0995839A3 (en) | 2001-11-07 |
| EP0995839A2 (en) | 2000-04-26 |
| HUP9903784A2 (en) | 2000-06-28 |
| SK144599A3 (en) | 2000-05-16 |
| HUP9903784A3 (en) | 2002-05-28 |
| HU9903784D0 (en) | 1999-12-28 |
| PL336183A1 (en) | 2000-04-25 |
| JP2000129620A (en) | 2000-05-09 |
| GB9823338D0 (en) | 1998-12-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20031023 |