GB2417247A - Method of making a bituminous composition - Google Patents

Method of making a bituminous composition Download PDF

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Publication number
GB2417247A
GB2417247A GB0416539A GB0416539A GB2417247A GB 2417247 A GB2417247 A GB 2417247A GB 0416539 A GB0416539 A GB 0416539A GB 0416539 A GB0416539 A GB 0416539A GB 2417247 A GB2417247 A GB 2417247A
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United Kingdom
Prior art keywords
bitumen
aggregate
mixer
filler
moisture content
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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.)
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Application number
GB0416539A
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GB0416539D0 (en
Inventor
Robert Charles Hansford
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.)
Tarmac Ltd
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Tarmac Ltd
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Filing date
Publication date
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Priority to GB0416539A priority Critical patent/GB2417247A/en
Publication of GB0416539D0 publication Critical patent/GB0416539D0/en
Publication of GB2417247A publication Critical patent/GB2417247A/en
Withdrawn legal-status Critical Current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
    • 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

Abstract

A mastic product comprising aggregate, filler and 85/25 grade bitumen is prepared by introducing the aggregate into a mixer, injecting the bitumen at an elevated temperature into the mixer, introducing the filler into the mixer, and mixing of the aggregate, bitumen and filler whilst allowing the aggregate, bitumen and filler to cool to produce a granular mastic product. The bitumen may be in the form of a foamed bitumen, which may comprise a mixture of bitumen and water. The aggregate may be dried or undried.

Description

1 2417247 Title: Mastic Composition and Method of Preparing Same
Description of Invention
This invention relates to a mastic composition of the type comprising a mixture of aggregate, bitumen and filler.
Conventionally, mastic products of this type have been made using a process which produces blocks of solidified product. Such a process often consumes a substantial amount of energy, mainly in the form of heat. In particular, all the components of the mastic are separately heated to an appropriate temperature in order to obtain a flowable product, which is then cast into blocks which are allowed to solidify. To use the mastic product, the blocks have to be first crushed, which involves a substantial expenditure of energy.
More recently, mastic products comprising aggregate, bitumen and filler have been made using a process which produces granular mastic product.
Patent specification WO97/24410 discloses such a process, which attempts to reduce the energy requirement by adopting a two-stage process which leads directly to the formation of a granular product rather than solid blocks. In the first stage the filler, which may not have been pre-heated, and the aggregate material, which will have been pre-heated at least to the extent necessary to dry it, is mixed with part of the required bitumen, which has been pre-heated to the usual temperature. The first stage of mixing is carried out without the application of heat so that the temperature of the partial mixture falls to a value substantially lower than that normally used for the conventional mixing process. In the second stage the remainder of the bitumen is added to the partial mixture after the latter has been allowed to cool, the bitumen again being added at the conventional temperature and continued mixing is said to produce a loosely-bound, easy-crumbling mass which readily produces a granular mastic product. This product can be used without the need to crush it.
The present invention provides a further method of preparing granular mastic product.
According to a first aspect of the invention there is provided a method of preparing a mastic product comprising aggregate, filler and 85/25 grade bitumen, comprising the steps of introducing the aggregate into a mixer, injecting the bitumen at elevated temperature into the mixer, introducing the filler into the mixer, and mixing the aggregate, bitumen and filler whist allowing the aggregate, bitumen and filler to cool to produce a granular mastic product.
The mastic product may be a marine mastic product.
The 85/25 grade bitumen is graded according to BS 3690. The bitumen may have a softening point of 50 C or higher. The bitumen may have a penetration value of 50 or lower.
Injection into the mixer may be achieved using a spray system. This may be positioned over the mixer.
The bitumen may be in the form of hot, molten bitumen.
The bitumen may be in the form of foamed bitumen. The foamed bitumen should have a half life and stability such that the bitumen therein is able to coat the aggregate, when the foamed bitumen and aggregate are mixed together. Preferably, the foamed bitumen has a half life of at least a few seconds. The foamed bitumen may comprise a mixture of bitumen and water.
The foamed bitumen may comprise a mixture of bitumen and approximately 2% water by mass of bitumen. The bitumen may be mixed with the water by injecting or spraying the water into the bitumen. The water may contain at least one foaming agent, for example a surfactant or a bleach. The foaming agent may help to produce a foamed bitumen of sufficient quality and with a sufficient half life, such that the bitumen therein is able to coat the aggregate.
The bitumen may be injected into the mixer at an elevated temperature in the region of 180 C to 200 C, and preferably at approximately 190 C. When the bitumen is in the form of foamed bitumen, the elevated temperature should be such that the viscosity of the bitumen is such that the water can be injected into the bitumen.
The aggregate may be in a dried condition. The aggregate may be in an undried condition having a moisture content.
The aggregate, bitumen and filler may form a mixture which has a controlled moisture content. The moisture content of the aggregate, bitumen and filler mixture may be controlled so as to maintain a mean moisture content in the mastic product of approximately 4% or less.
The moisture content of the aggregate, bitumen and filler mixture may be controlled in a number of ways. The moisture content of the mixture may be controlled by controlling the moisture content of the foamed bitumen.
Additionally or alternatively, the moisture content of the mixture may be controlled by controlling the moisture content of the undried aggregate. When the moisture content of the mixture is controlled solely in this way, the moisture content of the undried aggregate may be approximately 8% by weight of the aggregate. Additionally or alternatively, the moisture content of the mixture may be controlled by introducing water into the mixer. The moisture content of the aggregate, bitumen and filler mixture may therefore be controlled by controlling the inherent moisture content of the foamed bitumen, and/or controlling the inherent moisture content of the undried aggregate, and/or adding water to the mixer.
The method may further comprise introducing water into the mixer.
The aggregate may be introduced into the mixer in an unheated condition. The filler may be introduced into the mixer in an unheated condition.
The bitumen may be modified by the addition of one or more polymers.
The bitumen can contain polymers ranging from plastomers to elastomers.
Examples of suitable plastomers include ethyl vinyl acetate (EVA), polyethylene (PE), polypropylene (LDPE). Examples of suitable elastomers include styrene-butadiene-styrene (SBS), styrene-butadiene rubber (SBR), polybutadiene (PBd), styrene-ethylene-butadiene-styrene (SEBS).
The mastic product may contain additives to alter the binding and/or the rheology of the composition thereof. The additives may include cellulose fibres, and/or inorganic fibres and/or stearic acid.
The method of preparing the mastic product may involve a substantially continuous process. The aggregate, bitumen and filler may each be substantially continuously introduced into the mixer. Required amounts of the aggregate, bitumen and filler as a percentage of the mastic product may each be substantially continuously introduced into the mixer. The aggregate, bitumen and filler may therefore be substantially simultaneously introduced into the mixer.
The substantially continuous process may comprise substantially continuously introducing water into the mixer. The aggregate, bitumen and filler and water may therefore be substantially simultaneously introduced into the mixer.
The substantially continuous process may comprise operating the mixer substantially continuously throughout the introduction of the aggregate, bitumen, filler and water. The substantially continuous process may comprise operating the mixer substantially continuously throughout the mixing of the aggregate, bitumen, filler and water. The substantially continuous process may comprise substantially continuously discharging the mastic product from the mixer.
The method of preparing the mastic product may involve a discontinuous process. Such a discontinuous process is often referred to as a batch process. The aggregate, bitumen and filler may each be discontinuously introduced into the mixer e.g. in one or more batches. The required amounts of the aggregate, bitumen and filler to produce a batch of mastic product-may be s introduced into the mixer. Required amounts of the aggregate, bitumen and filler to produce a batch of mastic product may be substantially simultaneously introduced into the mixer. The required amounts of the aggregate, bitumen and filler to produce a batch of mastic product may be introduced into the mixer in an order. As an example, the aggregate may be introduced into the mixer first, followed by the bitumen, followed by the filler. Alternatively, the bitumen and the filler may be substantially simultaneously introduced into the mixer.
Alternatively, the aggregate and the filler may be substantially simultaneously introduced into the mixer. Other orders of introducing the aggregate, bitumen and filler into the mixer may be used.
The discontinuous process may comprise discontinuously introducing water into the mixer, e.g. in one or more batches. The water may be substantially simultaneously introduced into the mixer with the aggregate, bitumen and filler. Alternatively, the water may be introduced into the mixer after the aggregate. Alternatively, the aggregate and the water may be substantially simultaneously introduced into the mixer. Alternatively, the water may be introduced into the mixer after the bitumen. Alternatively, the bitumen and the water may be substantially simultaneously introduced into the mixer.
The discontinuous process may comprise operating the mixer substantially continuously throughout the introduction of any of the aggregate or bitumen or filler or water. The discontinuous process may comprise operating the mixer substantially continuously throughout mixing of any of the aggregate or bitumen or filler or water. The discontinuous process may comprise halting the operation of the mixer for a time after or prior to the introduction of any of the aggregate or bitumen or filler or water. The discontinuous process may comprise halting the operation of the mixer for one or more periods during the mixing of any of the aggregate or bitumen or filler or water. The discontinuous process may comprise discontinuously discharging the mastic product from the mixer, e.g. in one or more batches.
According to a second aspect of the invention there is provided a mastic product produced by the method of the first aspect of the invention.
The invention will now be described with reference to the following
Examples.
Example 1
(a) Composition: The aggregate has a particle size range as set out in the following table.
Gradine percent passing BS Sieve Sieve Mesh Percent mm 100 6.3 mm 95 5.0 mm 80 - 100 3.35 mm 65 - 85 2.36 mm 55 - 75 1.18 mm 35 - 55 600 1lm 20 - 40 212,um 5 - 15 75,um 0 - 5 The aggregate is undried, and preferably has a moisture content of approximately 8% by weight of aggregate. The aggregate is unheated, i.e. is at ambient temperature, e.g. in the range 5 - 20 C, prior to introduction into the mixer.
The bitumen is 85/25 grade bitumen, and is used in a quantity required to provide between 14% and 16%, preferably 15%, by weight of the final mastic product.
The filler comprises limestone material, having a particle size typically of 85 % not greater than 63pm. It is used in a quantity required to provide between 15 and 19 percent by weight of the final mastic product. The filler is unheated, i.e. is at ambient temperature, e.g. in the range 5 - 20 C, prior to
introduction into the mixer.
(b) Procedure: The aggregate is placed in two compartments of a feed hopper, from which it is substantially continuously introduced into the mixer. The mixer resembles a typical asphalt mixer, and is approximately 1.8m in length. The bitumen is supplied from a mobile tank, and is heated to a temperature in the range 180 - 210 C before water is injected into it. The bitumen/water mixture is then substantially continuously injected into the mixer through a spray system positioned over the mixer, thereby forming a foamed bitumen. The limestone filler is substantially continuously introduced into the mixer from a storage silo.
The aggregate, foamed bitumen and filler are therefore introduced into the mixer at substantially the same time. The method of preparing the mastic product therefore involves a substantially continuous process. The mixer is operated substantially continuously throughout the introduction of the aggregate, foamed bitumen and filler, and substantially continuously throughout mixing of the aggregate, foamed bitumen and filler.
The moisture content of the aggregate, bitumen and filler mixture is controlled. This can be achieved by controlling the moisture content of the undried aggregate introduced into the mixer. When the inherent moisture content of the undried aggregate is approximately 8% by weight of the aggregate, this is sufficient moisture content for the aggregate, bitumen and filler mixture. If the moisture content of the undried aggregate is below approximately 8% by weight of the aggregate, then water may be introduced substantially continuously into the mixer. The moisture content of the aggregate, bitumen and filler mixture can, additionally or alternatively, be controlled by controlling the moisture content of the foamed bitumen. The moisture content of the aggregate, bitumen and filler mixture is controlled to achieve a moisture content of a single sample of mastic product of approximately 4.5% or less, and a mean moisture content (over approximately samples) of the mastic product of approximately 4% or less. The mastic product produced by the above process comprises free-flowing granules having sizes typically in the range 0.1 mm to 50 mm.
The mastic product is discharged in a substantially continuous process from the mixer, and fed onto a stocking/loading conveyor, from which it may be bagged for storage or transportation to a point of use or may be placed in a lorry or other vehicle. The granular mastic product produced by this method may be used in the same manner as any other granular mastic product.
Example 2
(a) Composition: The aggregate has a particle size range as set out in the following table.
Gradine percent Lassie BS Sieve Sieve Mesh Percent mm 100 6.3 mm 95 5.0 mm 80 - 100 3.35 mm 65 - 85 2.36 mm 55 - 75 1.18mm 35-55 600 Am 20 40 212 rim 5 - 15 75,um 0 - 5 The aggregate is undried, and preferably has a moisture content of approximately 8% by weight of aggregate. The aggregate is unheated, i.e. is at ambient temperature, e.g. in the range 5 - 20 C, prior to introduction into the mixer.
The bitumen is 85/25 grade bitumen, and is used in a quantity required to provide between 14% and 16%, preferably 15%, by weight of the final mastic product.
The filler comprises limestone material, having a particle size typically of 85 % not greater than 63pm. It is used in a quantity required to provide between 15 and 19 percent by weight of the final mastic product. The filler is unheated, i.e. is at ambient temperature, e.g. in the range 5 - 20 C, prior to
introduction into the mixer.
(b) Procedure: The aggregate is placed in two compartments of a feed hopper, from which it is introduced substantially continuously into the mixer. The mixer resembles a typical asphalt mixer, and is approximately 1.8m in length. The bitumen is supplied from a mobile tank, and is heated to a temperature in the range 180 - 210 C. The bitumen is substantially continuously injected into the mixer through a spray system positioned over the mixer. The limestone filler is substantially continuously introduced into the mixer from a storage silo. The aggregate, bitumen and filler are therefore introduced into the mixer at substantially the same time. The method of preparing the mastic product therefore involves a substantially continuous process. The mixer is operated substantially continuously throughout the introduction of the aggregate, bitumen and filler, and substantially continuously throughout mixing of the aggregate, bitumen and filler.
The moisture content of the aggregate, bitumen and filler mixture is controlled. This is achieved by controlling the moisture content of the undried aggregate introduced into the mixer. When the inherent moisture content of the undried aggregate is approximately 8% by weight of the aggregate, this is sufficient moisture content for the aggregate, bitumen and filler mixture. If the moisture content of the undried aggregate is below approximately 8% by weight of the aggregate, then water may be substantially continuously introduced into the mixer. The moisture content of the aggregate, bitumen and filler mixture is controlled to achieve a moisture content of a single sample of mastic product of approximately 4.5% or less, and a mean moisture content (over approximately 30 samples) of the mastic product of approximately 4% or less. The mastic product produced by the above process comprises free- flowing granules having sizes typically in the range 0.1 mm to 50 mm.
The mastic product is discharged in a substantially continuous process from the mixer, and fed onto a stocking/loading conveyor, from which it may be bagged for storage or transportation to a point of use or may be placed in a lorry or other vehicle. The granular mastic product produced by this method may be used in the same manner as any other granular mastic product.
Example 3
(a) Composition: The aggregate has a particle size range as set out in the following table.
Gradina percent passing BS Sieve Sieve Mesh Percent mm 100 6.3 mm 95 5.0 mm 80 - 100 3.35 mm 65 - 85 2.36 mm 55 - 75 1.18mm 35-55 600 lam 20 40 212,um 5 - 15 75pm 0-5 The aggregate is dried. The aggregate is unheated, i.e. is at ambient temperature, e.g. in the range 5 - 20 C, prior to introduction into the mixer.
The bitumen is 85/25 grade bitumen, and is used in a quantity required to provide between 14% and 16%, preferably 15%, by weight of the final mastic product.
The filler comprises limestone material, having a particle size typically of 85 % not greater than 63,um. It is used in a quantity required to provide between 15 and 19 percent by weight of the final mastic product. The filler is unheated, i.e. is at ambient temperature, e.g. in the range 5 - 20 C, prior to
introduction into the mixer.
(b) Procedure: The aggregate is placed in two compartments of a feed hopper, from which it is substantially continuously inkroduced into the mixer. The mixer resembles a typical asphalt mixer, and is approximately 1.8m in length. The bitumen is supplied from a mobile tank, and is heated to a temperature in the range 180 - 210 C before water is injected into it. The bitumen/water mixture is substantially continuously injected into the mixer through a spray system positioned over the mixer, thereby forming a foamed bitumen. The limestone filler is substantially continuously introduced into the mixer from a storage silo.
The aggregate, foamed bitumen and filler are therefore introduced into the mixer at substantially the same time. The method of preparing the mastic product therefore involves a substantially continuous process. The mixer is operated substantially continuously throughout the introduction of the aggregate, foamed bitumen and filler, and substantially continuously throughout mixing of the aggregate, foamed bitumen and filler.
The moisture content of the aggregate, bitumen and filler mixture is controlled. This is achieved by controlling the moisture content of the foamed bitumen. This may also be achieved by substantially continuously introducing water into the mixer, if necessary. The moisture content of the aggregate, bitumen and filler mixture is controlled to achieve a moisture content of a single sample of mastic product of approximately 4. 5% or less, and a mean moisture content (over approximately 30 samples) of the mastic product of approximately 4% or less. The mastic product produced by the above process comprises free-flowing granules having sizes typically in the range 0.1 mm to mm.
The mastic product is discharged in a substantially continuous process from the mixer, and fed onto a stocking/loading conveyor, from which it may be bagged for storage or transportation to a point of use or may be placed in a lorry or other vehicle. The granular mastic product produced by this method may be used in the same manner as any other granular mastic product.
Example 4
(a) Composition: The aggregate has a particle size range as set out in the following table.
Grading percent passing BS Sieve Sieve Mesh Percent to mm 100 6.3 mm 95 100 5.0 mm 80 - 100 3.35 mm 65 - 85 2.36 mm 55 - 75 1.18 mm 35 - 55 600,um 20 - 40 212 lam 5 - 15 75pm 0-5 The aggregate is dried. The aggregate is unheated, i.e. is at ambient temperature, e.g. in the range 5 - 20 C, prior to introduction into the mixer.
The bitumen is 85/25 grade bitumen, and is used in a quantity required to provide between 14% and 16%, preferably 15%, by weight of the final mastic product.
The filler comprises limestone material, having a particle size typically of 85 % not greater than 63,um. It is used in a quantity required to provide between 15 and 19 percent by weight of the final mastic product. The filler is unheated, i.e. is at ambient temperature, e.g. in the range 5 - 20 C, prior to
introduction into the mixer.
(b) Procedure: The aggregate is placed in two compartments of a feed hopper, from which it is substantially continuously introduced into the mixer. The mixer resembles a typical asphalt mixer, and is approximately 1.8m in length. The bitumen is supplied from a mobile tank, and is heated to a temperature in the range 180 - 210 C. The bitumen is substantially continuously injected into the mixer through a spray system positioned over the mixer. The limestone filler is substantially continuously introduced into the mixer from a storage silo. The aggregate, bitumen and filler are therefore introduced into the mixer at substantially the same time. The method of preparing the mastic product therefore involves a substantially continuous process. The mixer is operated substantially continuously throughout the introduction of the aggregate, bitumen and filler, and substantially continuously throughout mixing of the aggregate, bitumen and filler.
The moisture content of the aggregate, bitumen and filler mixture is controlled. This is achieved by substantially continuously introducing water into the mixer. The moisture content of the aggregate, bitumen and filler mixture is controlled to achieve a moisture content of a single sample of mastic product of approximately 4.5% or less, and a mean moisture content (over approximately 30 samples) of the mastic product of approximately 4% or less.
The mastic product produced by the above process comprises free-flowing granules having sizes typically in the range 0.1 mm to 50 mm.
The mastic product is discharged in a substantially continuous process from the mixer, and fed onto a stocking/loading conveyor, from which it may be bagged for storage or transportation to a point of use or may be placed in a lorry or other vehicle. The granular mastic product produced by this method may be used in the same manner as any other granular mastic product.
Each Example described above can be carried out as a discontinuous process. The required amounts of aggregate, bitumen (on its own, or mixed with water), filler and water (when used) to produce a batch of mastic product are introduced into the mixer. The aggregate is introduced first, followed by the bitumen, followed by the filler. When water is used, this is introduced into the mixer after the aggregate. It will be appreciated that a different order of introduction into the mixer or substantially simultaneous introduction into the mixer may be used. The mixer may be operated continuously throughout introduction of the aggregate etc. into the mixer and throughout mixing, or may be halted at one or more periods of the process. The mastic product produced by this discontinuous or batch process has substantially the same properties as those described above.

Claims (28)

  1. CLAIMS: 1. A method of preparing a mastic product comprising aggregate,
    filler and 85/25 grade bitumen comprising the steps of introducing the aggregate into a mixer, injecting the bitumen at elevated temperature into the mixer, introducing the filler into the mixer, and mixing the aggregate, bitumen and filler whist allowing the aggregate, bitumen and filler to cool to produce a granular mastic product.
  2. 2. A method according to claim 1 wherein the mastic product is a marine mastic product.
  3. 3. A method according to claim 1 or claim 2 wherein the bitumen is in the form of hot, molten bitumen.
  4. 4. A method according to claim 1 or claim 2 wherein the bitumen is in the form of foamed bitumen.
  5. 5. A method according to claim 4 wherein the foamed bitumen comprises a mixture of bitumen and water.
  6. 6. A method according to claim 5 wherein the foamed bitumen comprise a mixture of bitumen and approximately 2% water by mass of bitumen.
  7. 7. A method according to claim 5 or claim 6 wherein the bitumen is mixed with the water by injecting or spraying the water into the bitumen.
  8. 8. A method according to any of claims 5 to 7 wherein the water contains at least one foaming agent.
  9. 9. A method according to any preceding claim wherein the bitumen is injected into the mixer at an elevated temperature in the region of 180 C to 200 C.
  10. 10. A method according to any preceding claim wherein the aggregate is in a dried condition.
  11. 1 1. A method according to any of claims 1 to 10 wherein the aggregate is in an undried condition having a moisture content.
  12. 12. A method according to any preceding claim wherein the aggregate, bitumen and filler form a mixture which has a controlled moisture content.
  13. 13. A method according to claim 12 wherein the moisture content of the aggregate, bitumen and filler mixture is controlled so as to maintain a mean moisture content in the mastic product of approximately 4% or less.
  14. 14. A method according to claim 12 as dependent from claim 5 or claim 13 as dependent from claim 5 wherein the moisture content of the aggregate, bitumen and filler mixture is controlled by controlling the moisture content of the foamed bitumen.
  15. 15. A method according to claim 12 as dependent from claim 11 or claim 13 as dependent from claim 11 wherein the moisture content of the aggregate, bitumen and filler mixture is controlled by controlling the moisture content of the undried aggregate.
  16. 16. A method according to claim 15 wherein the moisture content of the undried aggregate is approximately 8% by weight of the aggregate.
  17. 17. A method according to claim 12 as dependent from claims 5 and 11 or claim 13 as dependent from claims 5 and 11 wherein the moisture content of the aggregate, bitumen and filler mixture is controlled by controlling the moisture content of the foamed bitumen and the moisture content of the undried aggregate.
  18. 18. A method according to any of claims 12 to 17 wherein the moisture content of the aggregate, bitumen and filler mixture is controlled by introducing water into the mixer.
  19. 19. A method according to any preceding claim wherein the aggregate is introduced into the mixer in an unheated condition.
  20. 20. A method according to any preceding claim wherein the filler is introduced into the mixer in- an unheated condition.
  21. 21. A method according to any preceding claim further comprising introducing water into the mixer.
  22. 22. A method according to any preceding claim which involves a substantially continuous process.
  23. 23. A method according to claim 22 wherein the aggregate, bitumen and filler are each substantially continuously introduced into the mixer.
  24. 24. A method according to any preceding claim which involves a substantially discontinuous process.
  25. 25. A method according to claim 24 wherein the aggregate, bitumen and filler are each discontinuously introduced into the mixer, in one or more batches.
  26. 26. A method according to claim 25 wherein required amounts of the aggregate, bitumen and filler to produce a batch of mastic product are introduced into the mixer.
  27. 27. A method of preparing a mastic product comprising aggregate, bitumen and filler substantially as described herein with reference to Example 1 or Example 2 or Example 3 or Example 4.
  28. 28. A mastic product produced by the method as claimed in any of claims 1 to27.
GB0416539A 2004-07-24 2004-07-24 Method of making a bituminous composition Withdrawn GB2417247A (en)

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GB2417247A true GB2417247A (en) 2006-02-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2303966A1 (en) * 2008-07-21 2011-04-06 NCC Roads AB Method for preparing an asphalt compound

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5296025A (en) * 1991-04-18 1994-03-22 Isover Saint-Gobain Process and device for preparing an asphalt mix
WO1997002441A1 (en) * 1995-07-05 1997-01-23 Norco, Inc. Mechanical drive assembly
WO1999051678A1 (en) * 1998-04-02 1999-10-14 Rieber & Søn ASA A method for manufacturing granulated asphalt mastic, and a semi-finished product for use in the method
GB2339432A (en) * 1998-07-10 2000-01-26 Odebrecht Oil & Gas Services L A process for the manufacture of a bituminous composition
GB2351976A (en) * 1998-04-02 2001-01-17 Tarmac Uk Ltd Mastic composition and method of preparing same
GB2372251A (en) * 2001-02-20 2002-08-21 Slp Engineering Ltd Production of granular mastic
EP1398351A1 (en) * 2002-09-16 2004-03-17 Shell Internationale Researchmaatschappij B.V. Process for preparing foamed-asphalt aggregates

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5296025A (en) * 1991-04-18 1994-03-22 Isover Saint-Gobain Process and device for preparing an asphalt mix
WO1997002441A1 (en) * 1995-07-05 1997-01-23 Norco, Inc. Mechanical drive assembly
WO1999051678A1 (en) * 1998-04-02 1999-10-14 Rieber & Søn ASA A method for manufacturing granulated asphalt mastic, and a semi-finished product for use in the method
GB2351976A (en) * 1998-04-02 2001-01-17 Tarmac Uk Ltd Mastic composition and method of preparing same
GB2339432A (en) * 1998-07-10 2000-01-26 Odebrecht Oil & Gas Services L A process for the manufacture of a bituminous composition
GB2372251A (en) * 2001-02-20 2002-08-21 Slp Engineering Ltd Production of granular mastic
EP1398351A1 (en) * 2002-09-16 2004-03-17 Shell Internationale Researchmaatschappij B.V. Process for preparing foamed-asphalt aggregates

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2303966A1 (en) * 2008-07-21 2011-04-06 NCC Roads AB Method for preparing an asphalt compound
EP2303966A4 (en) * 2008-07-21 2014-07-16 Ncc Roads Ab Method for preparing an asphalt compound

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