US20050089371A1 - Method of preparing an asphalt paving material containing recycled plastics - Google Patents
Method of preparing an asphalt paving material containing recycled plastics Download PDFInfo
- Publication number
- US20050089371A1 US20050089371A1 US10/844,046 US84404604A US2005089371A1 US 20050089371 A1 US20050089371 A1 US 20050089371A1 US 84404604 A US84404604 A US 84404604A US 2005089371 A1 US2005089371 A1 US 2005089371A1
- Authority
- US
- United States
- Prior art keywords
- plastic particles
- aggregate
- sand
- percent
- plastic
- 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.)
- Abandoned
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
-
- 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
- E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
-
- 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
- E01C19/1027—Mixing in a rotary receptacle
- E01C19/1031—Mixing in a rotary receptacle the mixture being discharged continuously
-
- 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
- E01C19/1072—Supplying or proportioning the ingredients the solid ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
Definitions
- the present invention relates to a method of preparing an asphalt paving material containing recycled plastics.
- plastic waste takes hundreds of years to break down. If disposed of through incineration, there are polluting agent in the gas emissions during incineration.
- the plastic particles are in the one eighth of an inch to one quarter of an inch size.
- the plastic particles are used within a day or so of treatment, and are kept out of contact with free flowing air or sunlight until used.
- the plastic particle are then blended with rock aggregate and an asphaltic mix binder.
- a method of forming an asphalt paving material containing recycled plastics involves forming recycled plastics into plastic particles.
- a second step involves dry mixing and heating aggregate and sand.
- a third step involves dry mixing untreated plastic particles with the aggregate and sand, while continuing heating until the mixture of plastic particles, aggregate and sand reaches a temperature range provided in accepted road building specifications for heating aggregate.
- a fourth step involves adding liquid asphalt to the mixture of plastic particles, aggregate and sand.
- FIGURE is a flow diagram setting for the sequence of steps of the method of preparing an asphalt paving material containing recycled plastics.
- the recycled plastics 20 were ground into plastic particles 22 ranging in size from a powder to one quarter inch granules.
- the plastic particles were left with jagged edges, as this was believed to be beneficial to the bonding process.
- a mixing plant 24 was used to dry mix aggregate and sand to a temperature of 300 degrees Fahrenheit. This temperature was the temperature specified in the road building standard that was being followed.
- the plastic particles were then dry mixed in with the aggregate and sand.
- the plastic particles were untreated, ie. they were not subjected to any chemical or heat treatment prior to use.
- the temperature of the dry mixture of plastic particles, aggregate and sand initially dropped. Heating was continued until the mixture of plastic particles, aggregate and sand reached 300 degrees. Although 300 degrees was the temperature range specified, with road building standards the temperature usually is within a range of between 280 degrees and 310 degrees Fahrenheit.
- the dry mixture was then transported to the site of the road.
- Liquid asphalt was then added to the mixture of plastic particles, aggregate and sand, in a wet mixing process identified by reference numeral 26 .
- the temperature of the dry mixture was 252 degrees Fahrenheit.
- the asphalt was laid onto the road at 136 degrees Fahrenheit.
Landscapes
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Road Paving Machines (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
A method of forming an asphalt paving material containing recycled plastics. A first step involves forming recycled plastics into plastic particles. A second step involves dry mixing and heating aggregate and sand. A third step involves dry mixing untreated plastic particles with the aggregate and sand, while continuing heating until the mixture of plastic particles, aggregate and sand reaches a temperature range provided in accepted road building specifications for heating aggregate. A fourth step involves adding liquid asphalt to the mixture of plastic particles, aggregate and sand.
Description
- The present invention relates to a method of preparing an asphalt paving material containing recycled plastics.
- Placing recycled plastics into asphalt paving materials is an attractive alternative, from an environmental point of view, to other methods of disposing of plastic waste. If disposed of at a landfill site, plastic waste takes hundreds of years to break down. If disposed of through incineration, there are polluting agent in the gas emissions during incineration.
- A lot of research effort has gone into developing an asphalt material with suitable Marshall properties in terms of percentage of air voids, stability (mechanical strength) and flow (plastic resistance). The Marshall properties required for asphalt roads varies from jurisdiction to jurisdiction. A typical Canadian standard for air void would be between 3% and 5%. A typical Canadian standard for stability would be in excess of 6000 Newtons. A typical Canadian standard for flow would between 8 mm and 16 mm. U.S. Pat. No. 5,702,199 (Fishback 1999), describes an asphalt material containing recycled plastics that is able to meet the corresponding United States standards. According to the teachings of the Fishback reference, in order to meet those standards one must form the plastic material into particles. Preferably, most of the Class 1 and Class 2 plastic is removed, leaving Classes 3 through 7. Fishback also suggests that it would be undesirable to have too large a proportion from Class 4 and Class 6. Preferably, the plastic particles are in the one eighth of an inch to one quarter of an inch size. One must then further process the plastic particles to activate the surface of the particles to increase the surface tension and to cause free or active carbon atoms to be present in the molecules of the plastic material at the particle surface. Preferably, this is done by exposing the plastic particles to a flame treatment. Preferably, the plastic particles are used within a day or so of treatment, and are kept out of contact with free flowing air or sunlight until used. The plastic particle are then blended with rock aggregate and an asphaltic mix binder.
- What is required is an alternative method of preparing an asphalt paving material containing recycled plastics.
- According to the present invention there is provided A method of forming an asphalt paving material containing recycled plastics. A first step involves forming recycled plastics into plastic particles. A second step involves dry mixing and heating aggregate and sand. A third step involves dry mixing untreated plastic particles with the aggregate and sand, while continuing heating until the mixture of plastic particles, aggregate and sand reaches a temperature range provided in accepted road building specifications for heating aggregate. A fourth step involves adding liquid asphalt to the mixture of plastic particles, aggregate and sand.
- The advantage of the above described method is that it does not constitute a marked departure from asphalt mixing methods prescribed by existing road building procedures. As will hereinafter be further described, the results obtained by the method are well above industry specifications.
- These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
- THE FIGURE is a flow diagram setting for the sequence of steps of the method of preparing an asphalt paving material containing recycled plastics.
- The preferred method of preparing an asphalt paving material containing recycled plastics will now be described with reference to The FIGURE.
- In order to demonstrate the utility of the present invention as compared to the Fishback reference, the example below used recycled plastic taken solely from Class 2, which is one of the classes that the Fishback reference recommended be removed.
- Test Road
-
-
- 48.2% Sand
- 21.7% one quarter inch rock
- 12.7% one half inch rock
- 7.9% five-eighths inch rock
- 3.0% Class 2 recycled plastic
- 6.5% liquid asphalt
- (all ingredients are shown by weight and not by volume)
- Referring to THE FIGURE, the recycled
plastics 20 were ground intoplastic particles 22 ranging in size from a powder to one quarter inch granules. The plastic particles were left with jagged edges, as this was believed to be beneficial to the bonding process. - A
mixing plant 24 was used to dry mix aggregate and sand to a temperature of 300 degrees Fahrenheit. This temperature was the temperature specified in the road building standard that was being followed. - The plastic particles were then dry mixed in with the aggregate and sand. The plastic particles were untreated, ie. they were not subjected to any chemical or heat treatment prior to use. The temperature of the dry mixture of plastic particles, aggregate and sand initially dropped. Heating was continued until the mixture of plastic particles, aggregate and sand reached 300 degrees. Although 300 degrees was the temperature range specified, with road building standards the temperature usually is within a range of between 280 degrees and 310 degrees Fahrenheit. The dry mixture was then transported to the site of the road.
- Liquid asphalt was then added to the mixture of plastic particles, aggregate and sand, in a wet mixing process identified by
reference numeral 26. At the time of adding the liquid asphalt, the temperature of the dry mixture was 252 degrees Fahrenheit. The wet mix, after the liquid asphalt had been added, had a temperature of 184 degrees Fahrenheit. The asphalt was laid onto the road at 136 degrees Fahrenheit. - Core Samples Taken Revealed the Following Critical Data:
-
- Air voids—3.34%
- Stability—a problem was experienced in testing stability. The test had to be stopped at 18,318 Newtons as the testing equipment had reached its upper limit. How much greater than 18,000 Newtons the stability reading may be is not know at this time. However, 18,000 Newtons is three times the typical Canadian standard.
- Flow—16 mm
- Although the formulation described above contained Class 2 recycled plastic. It is believed from the work of Fishback that comparable results may be obtained through the use of Class 3 through 7 plastics. It is also believed that comparable results may be obtained through the use of an unclassified mixture of recycled plastics.
- Although the formulation described above contained 3% plastic particles by weight, it is believed that comparable results may be obtained through the use of between 1 percent and 10 percent plastic particles by weight of the mixture of plastic particles, liquid asphalt, aggregate and sand.
- Cautionary Warnings:
- When preparing test patches prior to construction of the test road, there were times when softness in the material resulted in problems being experienced in the laying the asphalt. One problem experienced was a wave motion during the rolling of the asphalt, which did not allow compaction of the asphalt as well as it should. Another problem was experienced during the screeding process, as a back and forth motion of a bar is used to spread the material. Should this occur, the problem can be addressed by reducing the plastic particle content of the mixture. For this reason a narrower range of between one percent and our percent by weight is preferred, as no problems in laying of the asphalt are likely to be encountered within this narrower range. It is, of course, recommended that some test patches be laid to ensure that the asphalt is spreading properly before a commitment is made to complete an entire road.
- In this patent document, the word “comprising” is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article “a” does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
- It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Claims (13)
1. A method of forming an asphalt paving material containing recycled plastics, comprising the steps of:
forming recycled plastics into plastic particles;
dry mixing and heating aggregate and sand;
dry mixing untreated plastic particles with the aggregate and sand, while continuing heating until the mixture of plastic particles, aggregate and sand reaches a temperature range provided in accepted road building specifications for heating aggregate; and
adding liquid asphalt to the mixture of plastic particles, aggregate and sand.
2. The method as defined in claim 1 , the plastic particles ranging in size from a powder to one quarter inch granules.
3. The method as defined in claim 1 , the plastic particles having jagged edges.
4. The method as defined in claim 1 , the mixture of plastic particles and aggregate being brought within a temperature range of between 280 degrees and 310 degrees fahrenheit.
5. The method as defined in claim 1 , the plastic particles constituting between one percent and ten percent of by weight of the plastic particles, aggregate and liquid asphalt.
6. The method as defined in claim 5 , the plastic particles constituting between one percent and four percent by weight.
7. The method as defined in claim 1 , the recycled plastic being an unclassified mixture of plastics.
8. The method as defined in claim 1 , the recycled plastic being from Class 2.
9. A method of forming an asphalt paving material containing recycled plastics, comprising the steps of:
forming recycled plastics into plastic particles ranging in size from a powder to one quarter inch granules;
dry mixing and heating aggregate and sand;
dry mixing untreated plastic particles with the aggregate and sand, while continuing heating until the mixture of plastic particles, aggregate and sand reaches a temperature range of between 280 degrees and 310 degrees Fahrenheit; and
adding liquid asphalt to the mixture of plastic particles, aggregate and sand until the there is between 6 percent and 8 percent liquid asphalt by weight, between 1 percent and 10 percent plastic particles by weight, aggregate and sand.
10. The method as defined in claim 9 , the plastic particles having jagged edges.
11. The method as defined in claim 9 , the plastic particles constituting between one percent and four percent by weight.
12. The method as defined in claim 9 , the recycled plastic being an unclassified mixture of plastics.
13. The method as defined in claim 9 , the recycled plastic being from Class 2.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2,444,307 | 2003-10-24 | ||
CA2444307A CA2444307C (en) | 2003-10-24 | 2003-10-24 | Method of preparing an asphalt paving material containing recycled plastics |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050089371A1 true US20050089371A1 (en) | 2005-04-28 |
Family
ID=34468697
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/844,046 Abandoned US20050089371A1 (en) | 2003-10-24 | 2004-05-11 | Method of preparing an asphalt paving material containing recycled plastics |
Country Status (2)
Country | Link |
---|---|
US (1) | US20050089371A1 (en) |
CA (1) | CA2444307C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100022686A1 (en) * | 2008-07-22 | 2010-01-28 | John Eric Partanen | Incorporation of plastic scrap in asphalt compositions |
US11067204B2 (en) | 2014-09-09 | 2021-07-20 | Imertech Sas | Polymer compositions |
ES2917750A1 (en) * | 2021-01-11 | 2022-07-11 | Reig Soldevila Tecnologia S L | Pavement (Machine-translation by Google Translate, not legally binding) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3112681A (en) * | 1959-08-03 | 1963-12-03 | Exxon Research Engineering Co | Paving with polymer-bonded aggregates |
US3852046A (en) * | 1971-10-22 | 1974-12-03 | H Brown | Method for recycling waste plastics and products thereof |
US4028293A (en) * | 1973-04-19 | 1977-06-07 | Hollandsche Wegenbouw Zanen B.V. | Method for preparing materials containing minerals and synthetic substances, materials manufactured according to said method and objects consisting of said materials |
US5558703A (en) * | 1992-11-12 | 1996-09-24 | Fina Research, S.A. | Bituminous compositions |
US5702199A (en) * | 1995-11-09 | 1997-12-30 | Plasphalt Project Ltd. Co. | Plastic asphalt paving material and method of making same |
US5801204A (en) * | 1994-07-19 | 1998-09-01 | Raisio Chemicals Oy | Method of reclaiming waste plastic material and a compound including waste plastic material |
US6290152B1 (en) * | 1996-12-02 | 2001-09-18 | Environmental Reprocessing, Inc. | Method for recycling asphalt material |
US20020020233A1 (en) * | 2000-08-03 | 2002-02-21 | Nobuyuki Baba | Hybrid pipette |
US6844418B2 (en) * | 2002-04-10 | 2005-01-18 | Bp Corporation North America Inc. | Waste plastic additive for asphalt |
-
2003
- 2003-10-24 CA CA2444307A patent/CA2444307C/en not_active Expired - Lifetime
-
2004
- 2004-05-11 US US10/844,046 patent/US20050089371A1/en not_active Abandoned
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3112681A (en) * | 1959-08-03 | 1963-12-03 | Exxon Research Engineering Co | Paving with polymer-bonded aggregates |
US3852046A (en) * | 1971-10-22 | 1974-12-03 | H Brown | Method for recycling waste plastics and products thereof |
US4028293A (en) * | 1973-04-19 | 1977-06-07 | Hollandsche Wegenbouw Zanen B.V. | Method for preparing materials containing minerals and synthetic substances, materials manufactured according to said method and objects consisting of said materials |
US5558703A (en) * | 1992-11-12 | 1996-09-24 | Fina Research, S.A. | Bituminous compositions |
US5801204A (en) * | 1994-07-19 | 1998-09-01 | Raisio Chemicals Oy | Method of reclaiming waste plastic material and a compound including waste plastic material |
US5702199A (en) * | 1995-11-09 | 1997-12-30 | Plasphalt Project Ltd. Co. | Plastic asphalt paving material and method of making same |
US6000877A (en) * | 1995-11-09 | 1999-12-14 | Plasphalt Project Ltd. Co. | Plastic asphalt paving material and method of making same |
US6290152B1 (en) * | 1996-12-02 | 2001-09-18 | Environmental Reprocessing, Inc. | Method for recycling asphalt material |
US20020020233A1 (en) * | 2000-08-03 | 2002-02-21 | Nobuyuki Baba | Hybrid pipette |
US6844418B2 (en) * | 2002-04-10 | 2005-01-18 | Bp Corporation North America Inc. | Waste plastic additive for asphalt |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100022686A1 (en) * | 2008-07-22 | 2010-01-28 | John Eric Partanen | Incorporation of plastic scrap in asphalt compositions |
US7772302B2 (en) * | 2008-07-22 | 2010-08-10 | Sierra Process Systems, Inc. | Incorporation of plastic scrap in asphalt compositions |
US11067204B2 (en) | 2014-09-09 | 2021-07-20 | Imertech Sas | Polymer compositions |
ES2917750A1 (en) * | 2021-01-11 | 2022-07-11 | Reig Soldevila Tecnologia S L | Pavement (Machine-translation by Google Translate, not legally binding) |
Also Published As
Publication number | Publication date |
---|---|
CA2444307A1 (en) | 2005-04-24 |
CA2444307C (en) | 2010-05-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |