WO1998044046A1 - Composition pour revetement routier - Google Patents

Composition pour revetement routier Download PDF

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Publication number
WO1998044046A1
WO1998044046A1 PCT/GB1997/000884 GB9700884W WO9844046A1 WO 1998044046 A1 WO1998044046 A1 WO 1998044046A1 GB 9700884 W GB9700884 W GB 9700884W WO 9844046 A1 WO9844046 A1 WO 9844046A1
Authority
WO
WIPO (PCT)
Prior art keywords
weight
surfacing composition
road surfacing
road
asphaltic
Prior art date
Application number
PCT/GB1997/000884
Other languages
English (en)
Inventor
Paul Phillips
Chris Whitworth
Original Assignee
Aggregate Industries Uk Limited
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 Aggregate Industries Uk Limited filed Critical Aggregate Industries Uk Limited
Priority to AU21719/97A priority Critical patent/AU2171997A/en
Priority to PCT/GB1997/000884 priority patent/WO1998044046A1/fr
Priority to GB9922370A priority patent/GB2338486B/en
Publication of WO1998044046A1 publication Critical patent/WO1998044046A1/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 present invention relates to an asphaltic road surfacing composition which can be used to lay motor racing circuits having improved skid resistance, spray reduction and durability, to road surfaces laid with said composition, and to processes for preparing said composition and laying said road surface.
  • an asphaltic road surfacing composition comprising 92 4 to 93 6% by weight of an aggregate and filler component and 6 4 to 7 6% by weight of a binder component, wherein d) the aggregate and filler component comprises from 58 to 78% by weight of crushed rock having a particle size greater than 2 mm, from 20 to 30% by weight of crushed rock fines and natural sand ha ⁇ ing a particle size less than 2 mm and from 2 to 12% by weight of a filler, and
  • the binder comprises bitumen having a penetration of from 50 to 100 pen and dry organic fibres containing at least 70% by weight of cellulose, said fibres being present in an amount which is from 0 3 to 1 5% bv weight of the total road surfacing composition
  • the bitumen should have a penetration of 50 pen
  • bitumen mav be modified with ethvlene-vinvl acetate copolymer, stvrene- butadiene-styrene block copolymer, styrene-butadiene rubber or natural latex Modification with these polvmers results in a surfacing composition which is both more elastic, making it less prone to cracking in cold weather, and more viscous, making it less likely to soften in hot weather
  • the polvmers should be present in an amount from 6 to 8% bv weight of the total binder
  • the cellulosic fibres should contain at least 70% bv weight of cellulose and be present in an amount of from 0 3 to 1 5% b ⁇ weight preferablv 0 45% by weight, of the surfacing composition Pelletised cellulosic fibres mav be used, in which case they should comprise at least 0 45% bv weight of the total surfacing mixture
  • suitable fibres include TopcelTM and TechnocelTM obtainable from Cellulose Fulstoff Fab ⁇ k, Fleenwerg, Moenchengladbach Typically, the fibres are obtained from recycled paper
  • the inclusion of cellulosic fibres in the binder provides a thick binder film, which acts as a strong adhesive and lubricant, facilitating compaction and integrity of the asphaltic surfacing
  • the asphaltic road surfacing composition of the present invention has a strong skeletal structure, leading to improved rut resistance and load bearing properties Motor racing circuits laid with the surfacing of the present invention show increased resistance to permanent deformation with use and improved durability
  • the road surfacing of the present invention has a micro texture which results in a considerable increase in skid resistance It also has good spray reducing characteristics in the wet due to its favourable macro texture and it reduces noise generation caused b ⁇ tyre surface contact
  • the crushed rock used in the present invention is the coarse aggregate element and refers to the particles whose size exceeds 2 mm, as tested using the appropriate British Standard test sieve It is obtained from the quarry process of blasting, crushing and screening of a mineral deposit
  • the crushed rock used can be any conventionally used in the production of stone mastic asphalts e g limestone andesite and granite
  • the crushed rock fines are particles whose size is less than 2 mm. as tested by the B S test sieve size 2 36 mm, and are obtained from the same quarry process as that used to obtain the crushed rock
  • Natural sand is a fine aggregate which is not the result of a primary activity such as quarry crushing/blasting, nor as the result of secondary aggregate production such as the crushing of demolition waste It is generally obtained from pit, dune or marine deposit exploitation, as dug and is screened without crushing
  • this fine aggregate element should comprise no greater than 50% by weight of natural sand
  • a preferred specification for the crushed rock, the crushed rock fines and natural sand mixture is as follows
  • the fillers used are those conventionally used in the production of stone mastic asphalts They are generally powders whose particle size is substantially less than 75 ⁇ m as tested by the appropriate British Standard test sieve.
  • suitable fillers include the product of milling limestone aggregate, hydrated lime and Portland cement. Preferably 2% by weight of filler is added.
  • the fillers used should comply with the requirements of British Standard Specification 594, Part 1 (published in 1992 by the British Standards Institute), the contents of which are incorporated herein by reference thereto.
  • the asphaltic road surfacing composition of the present invention is prepared using a conventional hot mix plant.
  • a process for preparing an asphaltic road surfacing composition comprising hot mixing, at a temperature of from 150 to 190 C C, 92.4 to 93.6% by weight of an aggregate and filler component and 6.4 to 7.6% by weight of a binder component, wherein: (i) the aggregate and filler component comprises from 58 to 78% by weight of crushed rock having a particle size greater than 2 mm, from 20 to 30% by weight of crushed rock fines and natural sand having a particle size less than 2 mm and from 2 to 12% by weight of a filler; and
  • the binder comprises bitumen having a penetration of from 50 to 100 pen and dry organic fibres containing at least 70% by weight of cellulose, said fibres being present in an amount which is from 0.3 to 1.5% by weight of the total road surfacing composition.
  • the hot mixing should take place in accordance with the requirements of British Standard Specification 4987, Part 1 (published in 1993 by the British Standards Institute), the contents of which are incorporated herein by reference thereto.
  • the crushed rock should, ideally, be in a surface dry condition before mixing.
  • the cellulose fibres should be introduced carefully into the mixture to ensure complete dispersal.
  • a method for laying the surface of a road comprising laying on a pre-prepared surface, preferably at a temperature of from 80 to 90°C and an average thickness of from 30 to 40 mm, an asphaltic road surfacing composition comprising 92.4 to 93.6% by weight of an aggregate and filler component and 6.4 to 7.6% by weight of a binder component, wherein:
  • the aggregate and filler component comprises from 58 to 78% by weight of crushed rock having a particle size greater than 2 mm, from 20 to 30% by weight of crushed rock fines and natural sand having a particle size less than 2 mm and from 2 to 12% by weight of a filler, and
  • the binder comprises bitumen having a penetration of from 50 to 100 pen and dry organic fibres containing at least 70% by weight of cellulose, said fibres being present in an amount which is from 0 3 to 1 5% bv weight of the total road surfacing composition
  • the existing road surface should ideally first be cleaned using steel brooms, suction sweeping or similar means
  • the surface may be moist but not wet and no standing water may be present
  • the tack coat (a bituminous primer) is Kl-40 catiomc bitumen complying with British Standard Specification 434, Part (published in 1989 bv the British Standards Institute), the contents of which are incorporated herein bv reference thereto
  • the asphaltic road surfacing composition of the present invention is usually laid in accordance with the requirements of Specification for Highway Works (SHW) Clause 901, published by HMSO for the UK Department of Transport, 7th Edition, Dec 1991, (the contents of which are incorporated herein by reference thereto) at an average thickness of from 30 to 40 mm
  • SHW Highway Works
  • the surfacing is typically applied at a composition temperature of from 80 to 90°C
  • the surfacing is compacted immediately, typically using at least two steel wheeled rollers, with a minimum mass of 3 tonnes per paver Preferablv, one roller should be a tandem drum roller
  • the present invention also provides road surface laid according to the method outlined above
  • the asphaltic road surfacing composition of the present invention gives road surfaces having an improved macro texture and micro texture
  • the road surfaces are highly compact with a reduced air void content
  • the road surfaces have an air void content of from 1 to 4% by volume
  • This compact structure improves the durability of the road surface in use at the motor racing circuit
  • the macro texture of the road surface of the present invention is of great importance both to the grip and the spray reduction provided.
  • the road surface of the present invention has an average texture depth of 0.8 mm ⁇ 0.2 mm This gives both excellent grip (the road surface preferably having a Sideways Force Coefficient of 0.50) and improved spray reduction (the road surface preferably having a hydraulic conductivity of 0.03 to 0.05 ms "2 ).
  • the skid resistance is mainly a function of the micro texture of the road surface.
  • the safety of a surfacing material is not just dependent on its micro texture, it is equally important to take into account its macro texture which has a significant effect on its ability to dissipate rain fall.
  • the asphaltic road surfacing composition of the present invention provides a road surface with a rugous surface texture which, through its interconnecting conduits, assist in the lateral displacement of water, thus reducing spray from tyres under wet conditions.
  • the road surfacing of the present invention is highly durable and thereby resistant to rutting and fatigue damage Tests have shown that in both respects the road surfacing of the present invention is superior to conventional motor racing surfaces
  • the raw materials used to prepare the surfacing composition of the present invention are cheaper than those used to prepare conventional surfacing compositions Furthermore, the time and labour required to lav circuits with the surfacing composition of the present invention are significantly lower than for conventional surfacing compositions
  • a one mile test track was laid, at an average thickness of from 30 to 40 mm and a composition temperature while laving of from 80 to 90°C, using the following composition of the present invention, to determine whether the material had the required performance levels of durability and safety ( 1 ) 91% by weight of a mixture of crushed rock, crushed rock fines and natural sand conforming to the following specification
  • a binder comprising bitumen having a penetration of 50 pen and dry organic fibres containing at least 70% by weight of cellulose, said fibres being present in an amount which is 0 45% by weight of the total composition.
  • This test track was compared with a track laid with the industry standard Delugrip 1
  • the wet skid resistance of the two test tracks was determined using the pendulum test (an on-site measurement of dry skid resistance developed by the UK Transport Research Laboratory, involving the measurement of frictional resistance of a standard mass brought into contact with the road surface by a standard swing). Measurements were made on trafficked material, where the mineral aggregate had been exposed at the surface, along the racing line at the corners of the test tracks and also on the untrafficked material. All skid tests were conducted in accordance with the procedure described in Road Note 27, published by HMSO for the UK Road Research Laboratory in 1983.
  • the skid resistance under wet conditions of the test circuit laid with the composition of the present invention was also assessed bv measurement of the Sideways Force Coefficient (SFC) during a simulated controlled brake using a Grip Tester obtained from Findlay Irvine Limited of Bog Road, Penicuik, Midlothian, U K
  • SFC Sideways Force Coefficient
  • the spray reduction properties of the test track laid with the composition of the present invention were determined by hydraulic conductivity tests conducted in accordance with Specification of Highway Works (SHW) Clause 940, 7th Edition, published bv HMSO for the UK Department of Transport. December 1991, the contents of which are incorporated herein bv reference thereto It is generally accepted that a hydraulic conductivity of greater than 0 02 ms " provides a significant contribution to sprav reduction
  • the test track of the present invention was found to have a hydraulic conductivity of 0 03-0 05 ms " , indicating excellent sprav reduction properties Circuits laid with DelugripTM, by contrast have a hydraulic conductivity of zero
  • the composition of the present invention thus provides a significant improvement in safety over the industry standard in wet-weather racing
  • the rut resistance of the test track was measured using the wheel tracking test laid out in British Standards Specification (B S ) 598, Part 100 (published in 1996 by the British Standards Institute), the contents of which are incorporated herein by reference thereto It was found that the rut resistance values for the test track were less than 1 5 mm This compares very favourably with the most stringent specification for Hot Rolled Asphalt Wearing Course of 2 0 mm
  • the void content of the surface of the track was measured using the test laid out in Draft for Development (DD) 228 (published in 1995 by the British Standards Institute), the contents of which are incorporated herein by reference thereto It was found to be from 1 to 4% by volume of the surface

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  • 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)
  • Road Paving Structures (AREA)

Abstract

L'invention concerne une composition pour revêtement routier asphaltique s'utilisant notamment pour des circuits de courses automobiles, qui comprend entre 92,4 et 93,6 % en poids d'un agrégat et d'une charge et entre 6,4 et 7,6 % en poids d'un liant. L'agrégat et la charge comprennent entre 58 et 78 % en poids de pierres concassées de dimension particulaire supérieure à 2 mm, entre 20 et 30 % en poids de fines de pierres concassées et de sable naturel de dimension particulaire inférieure à 2 mm et entre 2 et 12 % en poids de charge. Le liant contient du bitume ayant un indice de pénétration allant de 50 à 100 pen (1 pen = 0,1 mm) et des fibres organiques sèches contenant au moins 70 % en poids de cellulose, lesdites fibres étant présentes à concurrence de 0,3 à 1,5 % en poids de la composition totale pour revêtement routier. L'invention concerne en outre un procédé de mélange à chaud utilisé dans la préparation de la composition de revêtement, un procédé d'application de revêtements routiers et un type de revêtement routier.
PCT/GB1997/000884 1997-03-27 1997-03-27 Composition pour revetement routier WO1998044046A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU21719/97A AU2171997A (en) 1997-03-27 1997-03-27 Road surfacing composition
PCT/GB1997/000884 WO1998044046A1 (fr) 1997-03-27 1997-03-27 Composition pour revetement routier
GB9922370A GB2338486B (en) 1997-03-27 1997-03-27 Road surfacing composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB1997/000884 WO1998044046A1 (fr) 1997-03-27 1997-03-27 Composition pour revetement routier

Publications (1)

Publication Number Publication Date
WO1998044046A1 true WO1998044046A1 (fr) 1998-10-08

Family

ID=10806112

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/000884 WO1998044046A1 (fr) 1997-03-27 1997-03-27 Composition pour revetement routier

Country Status (3)

Country Link
AU (1) AU2171997A (fr)
GB (1) GB2338486B (fr)
WO (1) WO1998044046A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006074662A1 (fr) * 2005-01-13 2006-07-20 Serwin Holding Aps Asphalte a ultra haute resistance
US7517934B2 (en) 2003-07-31 2009-04-14 Basf Corporation Modified anionically polymerized polymers
JP2019023279A (ja) * 2017-07-21 2019-02-14 花王株式会社 アスファルト組成物及びその製造方法、並びにアスファルト用添加剤

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130014A1 (fr) * 1983-06-28 1985-01-02 Exxon Research And Engineering Company Compositions bitumineuses
DE4421726A1 (de) * 1994-06-21 1996-04-04 Peter Herrmann Bindemittel zur Herstellung von Belägen auf tragfähigen Untergründen
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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130014A1 (fr) * 1983-06-28 1985-01-02 Exxon Research And Engineering Company Compositions bitumineuses
DE4421726A1 (de) * 1994-06-21 1996-04-04 Peter Herrmann Bindemittel zur Herstellung von Belägen auf tragfähigen Untergründen
WO1996011980A1 (fr) * 1994-10-12 1996-04-25 I/S Kara Procede de production de particules de fibres cellulosiques, et particules de fibres cellulosiques

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7517934B2 (en) 2003-07-31 2009-04-14 Basf Corporation Modified anionically polymerized polymers
WO2006074662A1 (fr) * 2005-01-13 2006-07-20 Serwin Holding Aps Asphalte a ultra haute resistance
US7600943B2 (en) 2005-01-13 2009-10-13 Serwin Holding Aps Ultra high strength asphalt
JP2019023279A (ja) * 2017-07-21 2019-02-14 花王株式会社 アスファルト組成物及びその製造方法、並びにアスファルト用添加剤
CN110914368A (zh) * 2017-07-21 2020-03-24 花王株式会社 沥青组合物及其制造方法、以及沥青用添加剂
US11066558B2 (en) * 2017-07-21 2021-07-20 Kao Corporation Asphalt composition, method for producing same and additive for asphalt

Also Published As

Publication number Publication date
GB9922370D0 (en) 1999-11-24
GB2338486A (en) 1999-12-22
GB2338486B (en) 2000-08-09
AU2171997A (en) 1998-10-22

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