US20020170464A1 - Process and system for production of a warm foam mix asphalt composition - Google Patents

Process and system for production of a warm foam mix asphalt composition Download PDF

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Publication number
US20020170464A1
US20020170464A1 US09/868,346 US86834601A US2002170464A1 US 20020170464 A1 US20020170464 A1 US 20020170464A1 US 86834601 A US86834601 A US 86834601A US 2002170464 A1 US2002170464 A1 US 2002170464A1
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US
United States
Prior art keywords
binder
process according
asphalt composition
asphalt
mixing
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
Application number
US09/868,346
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English (en)
Inventor
Olle Larsen
Carl Robertus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kolo Veidekke AS
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Assigned to KOLO VEIDEKKE A.S. reassignment KOLO VEIDEKKE A.S. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ROBERTUS, CARL C., LARSEN, OLLE R.
Publication of US20020170464A1 publication Critical patent/US20020170464A1/en
Priority to US10/725,200 priority Critical patent/US6846354B2/en
Abandoned 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
    • E01C19/1077—Supplying or proportioning the ingredients the liquid ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L93/00—Compositions of natural resins; Compositions of derivatives thereof
    • 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
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

Definitions

  • the present invention relates to a process and a system for preparing a warm foam mix asphalt composition.
  • Asphalt mixes used for road building or paving in general consist of mixtures of stone/gravel, sand, filler and binder components.
  • the binder components are referred to as bitumen for the purpose of this specification, but other binder components may be equally applicable.
  • the bitumen components may be naturally occurring bitumen, or derived from a mineral oil.
  • the sand, stone/gravel and filler are referred to as aggregate material or aggregate grain material
  • bitumen acts as glue for the mineral aggregate components. Bitumen is a small fraction of a total asphalt mix, typically between 4 and 7% by mass (or 10 and 15% by volume).
  • Asphalt compositions are normally divided into two main categories, namely ⁇ hot mix>> asphalt and ⁇ cold mix>> asphalt.
  • a third less common “warm mix” asphalt has also been used, as will be described in more detail later.
  • Hot mix asphalt has better overall properties than die cold mix asphalt, and is for this reason used on roads with much traffic.
  • the aggregate material is heated before the hot binder material is added to the aggregate for mixing.
  • Hot mix asphalt production typically takes place at temperatures between 150° C.-190° C. and laying and compaction on the road typically take place at temperatures between 130° C.-160° C. In some cases even higher temperatures are prescribed.
  • the bitumen and mineral aggregates need to be heated due to several reasons.
  • the aggregates need to be dry, the bitumen needs to have a low viscosity to coat and adhere properly to the aggregate components and the asphalt mixture needs to have sufficiently low mix viscosity to enable laying, spreading and compacting on the road.
  • the type of asphalt mix and the grade of bitumen largely govern the production temperature. Hot mix asphalts gains their final strength/stability more or less right away. Therefore a road with a hot mix asphalt can bear traffic more or less immediately.
  • Cold mix asphalt is cheaper, easier to apply, more environmentally friendly, than the hot mix asphalt.
  • the aggregate material is cold and moist when it is mixed with a hot or cold binder material.
  • the binder is often foamed before it is mixed with the cold and moist aggregate material.
  • Cold mix asphalts needs a certain curing time necessary to build up the strength of the mixture.
  • the curing time can typically be from days to months. This in turn results in more rapid deformation, cracking and surface deterioration of an asphalt surface for the above-mentioned reasons, cold mix asphalt arc typically used for roads without much traffic in, for example, the Nordic countries and Australia.
  • WO 97/20890 suggests a ⁇ Process for preparing an asphalt composition>> where asphalt is produced at somewhat lower temperature than in the traditional hot mix process.
  • the use of lower temperatures is made possible by using the bituminous binder in separate parts, namely a hard and a soft component. Together the hard and the soft components form a bitumen which fulfils normal and specifications.
  • the soft component can be mixed with the mineral aggregates at much lower temperatures (60° C.-130° C., preferably 90° C.-110° C.),
  • the hard bitumen component is subsequently dispersed into this mixture in powder or emulsified form.
  • the ‘hard’ bitumen component has a penetration of 50 dmm or less.
  • the temperature of this component may typically be between 20° C. and 70° C. This process yields an asphalt mixture that can be laid, spread and compacted at temperatures between 70° C. and 100° C. Lab and field trials have shown good performance of these asphalt mixtures. Asphalts such as this, with reduced mixing temperature as compared to the hot mix, are for the purpose of this specification called ⁇ warm mix>>.
  • Asphalt compositions prepared from bitumen emulsions require a bitumen/aggregate mixture with a relatively high content of voids to allow the water to escape during the breaking of the emulsion, compaction and service.
  • An emulsion used in this process typically contains 30-50% water.
  • a bitumen emulsion is very expensive to produce both in terms of product costs and equipment costs for the contractor because of the need for an emulsion factory and extra storage tanks at the asphalt mix plant.
  • Transportation of emulsions is less cost-efficient due to the transportation of 30-50% water. Transportation of the increased mass also contributes to an increase of emission of environmentally unfriendly substances.
  • bitumen emulsions require some additional measures because of the chemicals used in production, the frost sensitivity of the end product and the requirement for separate tanks.
  • the present invention provides an asphalt composition that can be produced at lower temperatures than the hot mix, with lower energy input, with equal or better mechanical properties, and at the same or lower costs. This is, achieved with a process for preparing a warm mix asphalt composition comprising mixing a grained aggregate material with a soft binder, and adding a foamed hard binder to said mixture of grained aggregate material and soft binder.
  • FIG. 1 shows a schematic comparison of asphalt mix production routes comparing ⁇ Conventional Hot Asphalt Mix Production>> with the ⁇ Warm Foam Asphalt Mix Production>> of the invention
  • FIG. 2 shows an example of a method to foam a hard hinder.
  • the use of a foamed hard binder has significant economical and environmental advantages over the use of a bitumen powder or emulsified form of bitumen, without being detrimental to the quality of the resulting asphalt mixture and pavement.
  • the water content is only 2-5% as compared to the previously mentioned 30-50% of an emulsion. This has a significant effect in terms of storage, quality, heat requirements and transport. Compared with emulsified binders the lower water content of foamed bitumen enables immediate curing with limited heating.
  • the asphalt made with the process of the invention gives dense asphalt mixes with much lower void contents than the cold mix asphalts produced with foamed binder components.
  • the binders used in cold foam mixes have a soft penetration, between 180 dmm and 700 dmm.
  • the ‘hard’ bitumen component as used in an emulsion has typically a penetration of 50 dmm or less, compared to a maximum penetration value of the foamed hard bitumen in the invention of less than 100 dmm depending on the actual application.
  • both an emulsified and a non-emulsified soft binder component can be used, but the non-emulsified soft binder is preferred. If an emulsified soft binder is used, the emulsified soft binder contains a large amount of water. This water must be expelled from the mixture before full co-hesion and strength of the mixture is achieved.
  • the emulsion may either be a cationic or an anionic emulsion.
  • the hard binder component is added to the mixture as a foam.
  • the soft binder may also be added as a foam if this is found to have advantages in a specific situation.
  • the soft binder component can also be added to the aggregate at a relatively low temperature, i.e. a temperature of less than 120° C.
  • the soft binder will normally be added to the aggregate at a temperature of at least 70° C., preferably at a temperature in the range of from 60 to 130° C., more preferably in the range from 90 to 110° C.
  • a soft binder component is defined as a binder component having a penetration of at least 200 dmm
  • the soft binder component has a penetration of at least 500 dmm, preferably at least 700 dmm and more preferably at least 800 dmm. (measured by ASTM D 5 at 25° C.).
  • binder components are often characterised by their viscosity (determined by ASTM D 2171 at 100° C.)
  • the soft binder component has a viscosity of less than 0.300 Pa.s, preferably less than 0.200 Pa.s.
  • the asphalt prepared in the present invention is mainly intended for road use, but other use should also be considered to be within the scope of the invention.
  • the dense graded asphalt made in the process of the present invention has preferably a void content of less than about 10% and even more preferably a void content in the area between 3 and 10%.
  • the asphalt made in the process of the present invention could also be open graded asphalt with a void content approximately between 15% and 25%.
  • FIG. 1 Schematic comparison of process routes is given in FIG. 1, and a method for foaming the binder, in FIG. 2.
  • FIG. 2 A comparison of quality and costs is given in tables II and I.
  • An asphalt production facility for producing asphalt mixes uses the process of the invention and comprises a drying drum, a mixing mill, a mix to storage silo and bitumen foam production facilities. Stone/sand is introduced to the drying drum and is heated to approx. 130° C. The warm stone/sand is then led to the mixing mill where it is mixed with a soft bitumen at approx. 120 ° C. When the soft bitumen is properly mixed with the stone/sand, the hard bitumen foam is added to the mixture, and mixing continues until finally the filler is added to the mixture at approx. 20° C.
  • the product comprises approx., by mass, 90% stone/sand, 2,5% soft bitumen, 2,5% hard bitumen and 5% filler.
  • the foam is made (FIG. 2) by letting a controlled flow of hot bitumen into a piping system through a first valve (A).
  • the valve first (A) allows circulation to storage, and this ensures a stable temperature, required in the system.
  • the temperature of the tubing system is controlled and maintained by surrounding the piping with hot oil or heater cable, and isolation. The temperature selected is dependent on the quality, hardness and required increase of volume of the bitumen. The temperature is typically in the range from 130° C. to 180° C.
  • B second valve
  • the bitumen expands.
  • the bitumen is homogenised in a static mixer in a mixing chamber. Expanded bitumen, typically with a 10 to 20 times increase of volume, is led out of the mixing chamber through an outlet and is added to the aggregate mixture through one or several nozzles.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Architecture (AREA)
  • Materials Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Road Paving Structures (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Road Paving Machines (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
US09/868,346 2000-02-25 2001-02-05 Process and system for production of a warm foam mix asphalt composition Abandoned US20020170464A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/725,200 US6846354B2 (en) 2000-02-25 2003-12-01 Process and system for production of a warm foam mix asphalt composition

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20000955A NO311140B1 (no) 2000-02-25 2000-02-25 Prosess og system for produksjon av en lunken skumblandingsasfalt, samt anvendelse av denne
NO20000955 2000-02-25

Related Parent Applications (1)

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PCT/NO2001/000039 A-371-Of-International WO2001062852A1 (en) 2000-02-25 2001-02-05 Process and system for production of a warm foam mix asphalt composition

Related Child Applications (1)

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US10/725,200 Expired - Fee Related US6846354B2 (en) 2000-02-25 2003-12-01 Process and system for production of a warm foam mix asphalt composition

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US (2) US20020170464A1 (cs)
EP (1) EP1263885B1 (cs)
JP (1) JP4383706B2 (cs)
KR (1) KR100735112B1 (cs)
CN (1) CN1161422C (cs)
AT (1) ATE269883T1 (cs)
AU (2) AU2001237823B2 (cs)
CA (1) CA2401349C (cs)
CZ (1) CZ298950B6 (cs)
DE (1) DE60103985T2 (cs)
DK (1) DK1263885T3 (cs)
ES (1) ES2222983T3 (cs)
NO (1) NO311140B1 (cs)
NZ (1) NZ521062A (cs)
PL (1) PL194623B1 (cs)
PT (1) PT1263885E (cs)
TR (1) TR200401982T4 (cs)
WO (1) WO2001062852A1 (cs)

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US20070039520A1 (en) * 2004-02-18 2007-02-22 Meadwestvaco Corporation Method for producing bituminous compositions
US20070060676A1 (en) * 2005-09-12 2007-03-15 Mathy Construction Bituminous paving composition and process for bituminous paving
US20070082983A1 (en) * 2004-02-18 2007-04-12 Meadwestvaco Water-in-oil bituminous dispersions and methods for producing paving compositions from the same
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WO2013060110A1 (zh) * 2011-10-27 2013-05-02 深圳海川工程科技有限公司 一种温拌抗车辙的沥青混合料及其制备方法
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CN117736483A (zh) * 2023-11-08 2024-03-22 中建八局第四建设有限公司 一种预拌式泡沫沥青的制备方法

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JP6633248B2 (ja) * 2016-05-23 2020-01-22 江蘇天諾道路材料科技有限公司 プラントミックス中温化再生アスファルト混合物とその製造方法
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CN106968150A (zh) * 2017-04-11 2017-07-21 中铁五局集团有限公司 一种南方多雨地区sma沥青混凝土路面施工方法
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CN114436568B (zh) * 2020-10-16 2023-11-10 中国石油化工股份有限公司 沥青混合料及其制备方法和应用

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ATE269883T1 (de) 2004-07-15
NO20000955L (no) 2001-08-27
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AU3782301A (en) 2001-09-03
CA2401349A1 (en) 2001-08-30
CZ20022823A3 (cs) 2003-02-12
CN1404509A (zh) 2003-03-19
NO20000955D0 (no) 2000-02-25
NZ521062A (en) 2004-03-26
WO2001062852A1 (en) 2001-08-30
AU2001237823B2 (en) 2005-06-09
US20040244646A1 (en) 2004-12-09
DE60103985D1 (de) 2004-07-29
KR100735112B1 (ko) 2007-07-06
PL194623B1 (pl) 2007-06-29
PT1263885E (pt) 2004-10-29
CZ298950B6 (cs) 2008-03-19
DE60103985T2 (de) 2005-08-25
WO2001062852A8 (en) 2002-04-04
EP1263885B1 (en) 2004-06-23
DK1263885T3 (da) 2004-11-01
CN1161422C (zh) 2004-08-11
EP1263885A1 (en) 2002-12-11
US6846354B2 (en) 2005-01-25
JP2003524054A (ja) 2003-08-12
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KR20020097187A (ko) 2002-12-31
JP4383706B2 (ja) 2009-12-16
TR200401982T4 (tr) 2004-09-21

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