WO1998038250A1 - Procede a base de granules fibreux de production d'asphalte fibreux - Google Patents

Procede a base de granules fibreux de production d'asphalte fibreux Download PDF

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Publication number
WO1998038250A1
WO1998038250A1 PCT/NO1998/000066 NO9800066W WO9838250A1 WO 1998038250 A1 WO1998038250 A1 WO 1998038250A1 NO 9800066 W NO9800066 W NO 9800066W WO 9838250 A1 WO9838250 A1 WO 9838250A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibre
water
fibre pellets
pellets
bitumen
Prior art date
Application number
PCT/NO1998/000066
Other languages
English (en)
Norwegian (no)
Inventor
Ingvar Tuft
Original Assignee
Ingvar Tuft
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 Ingvar Tuft filed Critical Ingvar Tuft
Priority to AU61252/98A priority Critical patent/AU6125298A/en
Publication of WO1998038250A1 publication Critical patent/WO1998038250A1/fr

Links

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

Definitions

  • the invention concerns a method for producing fibrous asphalt, wherein aggregate, fibre pellets and bitumen are mixed at a temperature at which the bitumen is liquid.
  • the invention also concerns fibre pellets for use in the method.
  • bitumen and "asphalt” are interchanged to a certain extent. In order to avoid misunderstandings, in this patent application bitumen will be used to describe the pitch-like petroleum-containing binding agent, while asphalt will be used to describe the mixed mass which is employed in the finished product.
  • Asphalt is produced by mixing bitumen and aggregate, usually in the form of stones of different sizes, at approximately 180°C.
  • the hot mass is mixed in a mixer, whereupon it is spread over a base and pressed to form a hard and solid mass.
  • a known remedy for the above-mentioned problem is to add fibre to the asphalt mixture.
  • the fibres cause the bitumen to have a pulpy consistency so that it does not easily run away.
  • Asbestos fibre has been employed, but this has been abandoned due to the health risk associated with asbestos.
  • Cellulose fibre is therefore used, either in loose form or as pellets.
  • Cellulose fibre in loose form has the disadvantage that it requires a great deal of space during transport.
  • drum mixers which are a standard type of asphalt mixer, loose fibre will be caught up in air filters, and it may also burn up.
  • Known fibrous pellets consist of fibre and a binding agent, which may be bitumen or a semi-liquid oil.
  • a binding agent which may be bitumen or a semi-liquid oil.
  • bituminous fibre pellets contain a relatively large amount of bitumen, typically 50% by weight. Nevertheless there is uncertainty associated with dissolution of the pellets, and the attainment of a homogenous mixture requires a longer mixing time than in the production of asphalt which only contains bitumen and aggregate, or bitumen, aggregate and loose fibre.
  • the required mixing time depends on the kind of mixer employed, but in general experience shows that compared with the production of asphalt with loose fibre the required mixing time increases by between 20 and 30% when known fibre pellets are used.
  • No 173 191 (Rettmeier) describes a granulate for introducing a fibrous filler material into liquid bitumen.
  • the granulate includes fibres of the fibrous material, the fibres being coated and agglomerated to the granulate by a binding agent which has a binding effect on the fibres outside the said liquid bitumen and which loses its binding effect in the liquid bitumen in order thereby to cause dissolution of the granulates in the liquid bitumen, thereby obtaining a substantially homogeneous dispersion of the fibres in the liquid bitumen.
  • the binding agent may be bitumen, and the fibres may be cellulose fibres or wood fibres.
  • the object of the invention is to provide a method for producing fibrous asphalt wherein fibre pellets are employed, where the required mixing time is reduced compared with the required mixing time with the use of known fibre pellets. It is a further object to provide fibre pellets for use in the method, and that the use of these fibre pellets results in reduced transport costs compared with known fibre pellets.
  • the invention consists in the mixing of aggregate, fibre pellets and bitumen at a temperature at which the bitumen is liquid, and is characterized by the addition of hydrous fibre pellets, whereby, since the temperature at which bitumen is liquid is higher than the boiling point of the water, the heating causes evaporation and expansion of the water in the fibre pellets with associated rapid dissolution of the fibre pellets and dispersion of the fibres.
  • asphalt is produced by mixing bitumen and aggregate at a temperature of approximately 180°C.
  • the pressure inside the asphalt mixture is atmospheric or slightly higher.
  • the production of asphalt may also be undertaken at other temperatures than 180°C, and it is obvious that the effect of the water's evaporation and expansion and the explosive dissolution of the fibre pellets are also not dependent on exactly this temperature.
  • the reason for producing asphalt at 180°C is that this temperature represents a sensible choice regarding the balance between the bitumen's viscosity, evaporation or burning off of solvents in the bitumen and heating economy.
  • bitumen, aggregate and fibre are added in the production of asphalt both by the known method and by the method according to the invention.
  • the order in which bitumen, aggregate and fibre are added is immaterial per se for the result, i.e. the finished asphalt mixture.
  • the shortest mixing time is achieved by first heating up the aggregate, then adding the fibres and finally adding hot bitumen. In this way the fibres are dispersed in the aggregate, and the bitumen is uniformly dispersed in the mixture of aggregate and fibre.
  • Fibre pellets according to the invention consist of a substantially fibrous material which is held together by a binding agent in addition to containing water.
  • the explosive dissolution of the fibre pellets will be more or less dependent on the water content, and neither the method according to the invention nor the fibre pellets according to the invention is dependent on a specific water content. It has been found, however, that the water content of the fibre pellets should be between 5 and 40% by weight, more preferred between 10 and 30% by weight, further preferred between 15 and 25% by weight and most preferred approximately 20% by weight. This water content of 20%) by weight has been shown to represent a good balance between consideration of dispersion of the fibres in the production of asphalt at 180°C, and a desire that the water content should not be higher than necessary on account of the costs of transport of the pellets.
  • the fibre pellets can be prepared by known methods and known devices.
  • a water-soluble binding agent is employed, this being highly advantageous with regard to the compatibility with the water in the pellets.
  • the fibre pellets contain wood fibre, and lignin is used as the binding agent.
  • Paper contains fibres of different types, such as cellulose fibres, and may also contain filler materials such as clay.
  • Some types of paper mainly contain wood pulp, and it has been found that this type of paper, and particularly paper which contains mechanically ground wood pulp, is highly suitable for the production of fibre pellets according to the invention. If this type of paper is used as the basic material for the pellets, it is not necessary to add extra binding agent, since lignin which exists in the mechanically ground wood pulp is adequate as a binding agent.
  • Some types of newspaper contain mainly mechanically ground wood pulp, and it has been found that this newspaper is highly suitable as a basic material for production of fibre pellets according to the invention. The newspaper also contains printer's ink, and it has been found that this printer's ink acts as a binding agent and is advantageous in the production of the pellets.
  • the fibre pellets can be produced in a simple and reasonably priced manner, since collected newspaper is easily available at a low cost. At present there is an excess of collected newspaper, with the result that the production of fibre pellets according to the invention also provides environmental benefits.
  • fibre pellets are obtained with a higher fibre content, which compared to the pellets mentioned at the beginning provides lower transport costs.
  • An asphalt of the known type SKA 16 i.e. a so-called skeleton asphalt with up to 16 mm large aggregate, contains 8% by weight of stone filler materials with a size up to 0.074 mm, 20% by weight of stones with a size 0-8 mm,
  • This mixture is fed into an extruder with a temperature of approximately 105°C, where by means of a feed screw the mixture is pressed through a nozzle plate with openings of approximately 3 mm, thus forming strands, while at the same time approximately half the water is pressed out of the mixture or evaporates. On the outside of the nozzle plate the strands are cut into lengths of approximately 4 mm.
  • Fibre pellets are thereby produced consisting of approximately 20% by weight of water and the rest mainly of mechanically ground wood pulp, held together by a binding agent composed of lignin, some printer's ink and also smaller proportions of other components which were in the newspaper.
  • These other components which were originally in the newspaper may be colouring matter, small amounts of clay, cellulose, resin, various oils and also other components. As long as these other components occur in small amounts they are of no importance for the properties of the fibre pellets.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

Dans ce procédé de production d'asphalte fibreux, on mélange un agrégat, des granulés fibreux et du bitume à une température à laquelle le bitume est liquide. On ajoute des granulés fibreux hydratés, ce qui a pour effet, étant donné que la température à laquelle le bitume se liquéfie est supérieure au point d'ébullition de l'eau, de provoquer une évaporation et une expansion de l'eau dans les granulés fibreux, suivies d'une dissolution rapide des granulés et d'une dispersion des fibres. Les granulés fibreux, utiles dans le procédé, contiennent idéalement environ 20 % en poids d'eau et en outre, ils se composent sensiblement d'une matière dont les fibres sont maintenues entre elles par un agent de liaison.
PCT/NO1998/000066 1997-02-28 1998-02-27 Procede a base de granules fibreux de production d'asphalte fibreux WO1998038250A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61252/98A AU6125298A (en) 1997-02-28 1998-02-27 Method and fibre pellets for producing fibrous asphalt

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO970951 1997-02-28
NO970951A NO305760B1 (no) 1997-02-28 1997-02-28 FremgangsmÕte og fiberpellets til fremstilling av fiberholdig asfalt

Publications (1)

Publication Number Publication Date
WO1998038250A1 true WO1998038250A1 (fr) 1998-09-03

Family

ID=19900444

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1998/000066 WO1998038250A1 (fr) 1997-02-28 1998-02-27 Procede a base de granules fibreux de production d'asphalte fibreux

Country Status (3)

Country Link
AU (1) AU6125298A (fr)
NO (1) NO305760B1 (fr)
WO (1) WO1998038250A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988008438A1 (fr) * 1987-05-01 1988-11-03 Stephan Rettenmaier Granules comprenant des charges fibreuses
WO1996011980A1 (fr) * 1994-10-12 1996-04-25 I/S Kara Procede de production de particules de fibres cellulosiques, et particules de fibres cellulosiques

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988008438A1 (fr) * 1987-05-01 1988-11-03 Stephan Rettenmaier Granules comprenant des charges fibreuses
WO1996011980A1 (fr) * 1994-10-12 1996-04-25 I/S Kara Procede de production de particules de fibres cellulosiques, et particules de fibres cellulosiques

Also Published As

Publication number Publication date
NO305760B1 (no) 1999-07-19
NO970951D0 (no) 1997-02-28
NO970951L (no) 1998-08-31
AU6125298A (en) 1998-09-18

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