EP1358271A1 - Method for enhancing resistance of a bituminous mix to chemical attacks - Google Patents

Method for enhancing resistance of a bituminous mix to chemical attacks

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Publication number
EP1358271A1
EP1358271A1 EP01994916A EP01994916A EP1358271A1 EP 1358271 A1 EP1358271 A1 EP 1358271A1 EP 01994916 A EP01994916 A EP 01994916A EP 01994916 A EP01994916 A EP 01994916A EP 1358271 A1 EP1358271 A1 EP 1358271A1
Authority
EP
European Patent Office
Prior art keywords
bituminous
mix
weight
bituminous mix
aggregates
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.)
Withdrawn
Application number
EP01994916A
Other languages
German (de)
French (fr)
Inventor
Gabriella Delgado-Bertrand
Graziella Durand
Jean-François GALL
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.)
Colas SA
Original Assignee
Colas SA
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 Colas SA filed Critical Colas SA
Publication of EP1358271A1 publication Critical patent/EP1358271A1/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Withdrawn legal-status Critical Current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
    • 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
    • E01C7/26—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
    • E01C7/265—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre with rubber or synthetic resin, e.g. with rubber aggregate, with synthetic resin binder
    • 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 relates to a method for improving the resistance to chemical attack by a bituminous mix intended for producing the various layers of a roadway, in particular the wearing course, in particular aeronautical roadways or any other roadway subject to chemical attack. .
  • a bituminous mix intended for producing the various layers of a roadway, in particular the wearing course, in particular aeronautical roadways or any other roadway subject to chemical attack.
  • the surface and the body of the pavements are liable to deteriorate.
  • environmental conditions other than traffic and weather conditions can also adversely affect the condition of the roadway. These include environmental conditions linked to pollution.
  • leaks, or even spills of petroleum liquids on the pavement can degrade the pavement by dissolving the bitumen.
  • Chemicals of the fluxing or petrochemical solvent type are known to be particularly aggressive with respect to this type of material.
  • the present invention therefore relates to a process for improving the resistance to chemical attack by bituminous mixes for the manufacture of roadways and which overcomes the drawbacks of the prior art.
  • the subject of the present invention is a process for increasing the resistance to chemical aggressions of bituminous mixes, in particular those linked to leaks or spills of petroleum liquids, and which leads to mixes which are neither toxic nor susceptible to contain carcinogens.
  • bituminous mixes in particular those linked to leaks or spills of petroleum liquids, and which leads to mixes which are neither toxic nor susceptible to contain carcinogens.
  • polymer type additives for improving the mechanical properties of bituminous binders or bituminous mixes.
  • French patent application FR-2753210 describes a bituminous mix for road surfacing based on bitumen modified by polymers and in which polyethylene has been added. Thanks to such a coating, it was possible to improve the water and frost resistance, the resistance to punching and rutting, the rigidity and the resistance to fatigue.
  • European patent EP-0605377 describes asphaltic compositions for the preparation of draining mixes, comprising a first modifier chosen from styrene-butadiene or styrene-isoprene copolymers, their blends and recycled tires, and a second modifier chosen from polyolefins, polyethylene terephthalate and their mixtures. These additives make it possible to increase the resistance to fatigue, the resistance to permanent deformation, as well as the hesitant and cohesive properties.
  • bitumens can be modified by terpolymers, such as for example the compound of an ethylenic chain with functional groups of butyl acrylate and methyl glycidyl acrylate which ensures good stability to the bitumen / polymer mixture , as well as elastomers and plastomers allowing a significant improvement in resistance to cracking and rutting.
  • terpolymers such as for example the compound of an ethylenic chain with functional groups of butyl acrylate and methyl glycidyl acrylate which ensures good stability to the bitumen / polymer mixture , as well as elastomers and plastomers allowing a significant improvement in resistance to cracking and rutting.
  • bitumens with polyvinyl chloride (PVC), other copolymers based on styrene and butadiene, or ethylene and vinyl acetate (EVA).
  • PVC polyvinyl chloride
  • EVA ethylene and vinyl acetate
  • the object of the invention therefore relates to a method for improving the resistance to chemical attack of a bituminous mix for road surfaces comprising a bituminous binder and aggregates, characterized in that it consists in adding to the bituminous mix 1 to 5 % by weight of at least one polyolefin and preferably 1 to 2% by weight relative to the weight of the aggregates, to obtain a modified bituminous mix having a compactness ratio greater than or equal to 97%.
  • chemicals of the fluxing type or petrochemical solvent are particularly aggressive with respect to bituminous mixes.
  • the ability of the mix to resist these attacks is called anti-kerosene or anti-K.
  • the anti-K character will be more or less marked depending on the composition of the mix.
  • bitumen of the composition according to the invention is a bitumen modified by polymers, the bitumens modified by polymers being defined within the meaning of the document "Technical Guide: use of modified binders, special bitumens and bitumens with additives in techniques "previously mentioned.
  • the polymers are advantageously chosen from styrene-butadiene or styrene-isoprene copolymers and their mixtures or terpolymers.
  • bituminous mix comprises 3 to 1 1, preferably 5 to 1 1% by weight of bituminous binder relative to the weight of the aggregates.
  • the granulometry of the aggregates is chosen from the range 0 / Dmax, Dmax being the maximum diameter of the aggregate as defined according to standard XP P 1 8-540, and going from 4 to 25 mm.
  • the polyolefin is advantageously a polyethylene, a polypropylene or a mixture of the two.
  • the polyolefin may be virgin, that is to say coming directly from industrial production, or from recovery, that is to say obtained by recycling used objects or manufacturing waste comprising polyolefins.
  • the polyolefin, the bituminous binder and the aggregates are kneaded to form the modified bituminous mix.
  • the kneading takes place at a temperature of 140 to 190 ° C, and preferably from 160 to 190 ° C.
  • bituminous mixes obtained according to the present invention have a Rchydrocarburei ⁇ 'c / Rcair-i sc ratio greater than or equal to 0.70, where Rchydrocarburei 8 ° c is the compressive strength at 1 8 ° C after immersion for one week in a hydrocarbon bath at 18 ° C and Rcair 18 ° c the compressive strength at 18 ° C in air.
  • the compactness ratio of bituminous mixes according to the invention, or else modified bituminous mixes, measured according to standard NF P 98 250-6 is greater than or equal to 97%.
  • Bituminous mix manufactured using the process according to the invention, can be used on pavements with a high potential for receiving an accidental oil spill, road pavements, aeronautical pavements, tank tracks and military roads. , as well as on industrial platforms and roads and also on bus tracks and tram tracks on tires.
  • bitumen 50/70 or - bitumen 70/100, or
  • Coal tar mix binders (prior art binder)
  • Polyolefin low density polyethylene, presented in the form of 0/4 mm lenses
  • the compressive strength after immersion in the Exxsol D80 oil bath at 18 ° C is also determined by carrying out compression tests according to standard NF P 98-251-1. For this determination, the DU RI EZ test pieces are prior to the mechanical characterization test, completely immersed for one week in an oil bath at a temperature of 18 ° C.
  • the ratio Rckérosène18 ° C / Rcairi8 ° c is calculated in order to estimate the degree of conservation of the compression resistance of a bituminous mix after complete immersion in an aggressive agent such as petroleum Exxsol D80.
  • the ratio Rchydrocarbure ⁇ a ° c / Rcair 18 ° c is representative of the anti-K character of the bituminous mix. The closer the value of this ratio is to 1, the more marked the anti-K character of the mix, or the higher the resistance to chemical aggression caused by petroleum. compactness
  • the compactness is measured according to standard NF P 98 250-6. It is a measurement of the apparent density of a test piece by hydrostatic weighing.
  • a first bituminous mix was prepared according to the invention (EB 1), by mixing, with 100 parts of aggregates, 6 parts of a 70/100 bitumen for 4 minutes at 180 ° C. Then, 1.5 parts of a polyethylene are added to the mix obtained and kneaded for 8 minutes to homogenize well.
  • a second bituminous mix was prepared according to the invention (EB2), by mixing, with 100 parts of aggregates, 6 parts of a 180/220 bitumen for 4 minutes at 150 ° C. Then, 1 to 2 parts of a polyethylene are added to the mix obtained and the whole is kneaded for 8 minutes to homogenize well.
  • EB2 bituminous mix
  • a third bituminous mix according to the invention was prepared (EB3), by mixing, with 100 parts of aggregates, 6 parts of a 50/70 modified bitumen based on polymers or terpolymers, and 1.5 parts of a wax-shaped polyethylene, and the whole is kneaded for 4 minutes at 180 ° C. to homogenize well.
  • bituminous mixes T1 and T2 containing neither polyethylene nor polymers: - bituminous mix T1 was obtained, by adding 6 parts by weight of a bitumen 50/70 to 100 parts by weight of aggregates, then kneading everything for 4 minutes at 150 ° C.,
  • bituminous mix T2 was obtained, by adding 7.5 parts of STAVOJET® coal tar to 100 parts of aggregates, then mixing everything for 4 minutes at 150 ° C.
  • bituminous mixes manufactured using the process according to the invention (EB 1, EB2 and EB3) and having undergone chemical attack, are better than those of the T1 mix containing neither polyethylene nor polymers.
  • bituminous mixes EB1, EB2 and EB3 retain more than 75% of their mechanical resistance in compression after a full immersion of one week in an oil bath (Exxsol D80®), while the bituminous mix T1 does not canned only 18%.
  • the hydrocarbon content of the asphalt mixes EB1 to EB3 are lower than those of the asphalt mix T2, for which the binder is a coal tar but of the same order of magnitude as the control T1.
  • the values of Rchydrocarbure ⁇ 8 ° c / Rcair 1 8 ° c show that the bituminous mixes EB 1, EB2 and EB3 have an anti-K character relatively close to that of the mix asphalt T2, with a very significant improvement in the resistance to 50 ° C in the air.

Abstract

The invention concerns a method for enhancing the resistance of a road surfacing bituminous mix to chemical attacks, comprising a bituminous binder and aggregates. The method is characterised in that it consists in adding to the bituminous mix 1 to 5 wt. % of at least a polyolefin, preferably 1 to 2 wt. % relative to the weight of the aggregates to obtain a modified bituminous mix having a compactness rate not less than 97 %.

Description

Procédé pour améliorer la résistance aux agressions chimiques d'un enrobé bitumineux. Process for improving the resistance to chemical aggressions of a bituminous mix.
L'invention concerne un procédé pour améliorer la résistance aux agressions chimiques d'un enrobé bitumineux destiné à la réalisation des différentes couches d'une chaussée, notamment la couche de roulement, en particulier les chaussées aéronautiques ou toute autre chaussée sujette à des agressions chimiques. Sous l'action agressive du trafic et des intempéries, la surface et le corps des chaussées sont susceptibles de se dégrader. En outre, des conditions d'environnement autres que le trafic et les conditions climatiques peuvent également nuire à l'état de la chaussée. Il s'agit notamment des conditions d'environnement liées à la pollution. En particulier, des fuites, voire même des déversements de liquides pétroliers sur la chaussée peuvent dégrader la chaussée par dissolution du bitume. Les produits chimiques de type fluxant ou solvant pétrochimique sont connus pour être particulièrement agressifs vis à vis de ce type de matériau .The invention relates to a method for improving the resistance to chemical attack by a bituminous mix intended for producing the various layers of a roadway, in particular the wearing course, in particular aeronautical roadways or any other roadway subject to chemical attack. . Under the aggressive action of traffic and bad weather, the surface and the body of the pavements are liable to deteriorate. In addition, environmental conditions other than traffic and weather conditions can also adversely affect the condition of the roadway. These include environmental conditions linked to pollution. In particular, leaks, or even spills of petroleum liquids on the pavement can degrade the pavement by dissolving the bitumen. Chemicals of the fluxing or petrochemical solvent type are known to be particularly aggressive with respect to this type of material.
U ne amélioration a été obtenue en utilisant pour la fabrication de ces chaussées, des enrobés à base de goud ron connus pour leur capacité à résister aux agressions chimiques. Cependant, de tels enrobés présentent les inconvénients d'être non seulement toxiques, mais aussi de contenir des substances cancérigènes.U improvement has been obtained by using for the manufacture of these pavements, asphalt based tar known for their ability to resist chemical attack. However, such coated materials have the drawbacks of being not only toxic, but also of containing carcinogenic substances.
La présente invention a donc pour objet un procédé pour améliorer la résistance aux agressions chimiques des enrobés bitumineux pour la fabrication de chaussées et qui remédie aux inconvénients de l'art antérieur.The present invention therefore relates to a process for improving the resistance to chemical attack by bituminous mixes for the manufacture of roadways and which overcomes the drawbacks of the prior art.
Plus particulièrement, la présente invention a pour objet un procédé pour accroître la résistance aux agressions chimiques des enrobés bitumineux, en particulier celles liées à des fuites ou des déversements de liquides pétroliers, et qui conduit à des enrobés qui ne sont ni toxiques, ni susceptibles de contenir des substances cancérigènes. L'homme de l'art connaît l'utilisation d'additifs de type polymère pour l'amélioration des propriétés mécaniques des liants bitumineux ou des enrobés bitumineux. Ainsi, la demande de brevet français FR-2753210 décrit un enrobé bitumineux pour revêtement routier à base de bitume modifié par des polymères et dans lequel on a ajouté du polyethylène. Grâce à un tel enrobé, on a pu améliorer la tenue à l'eau et au gel, la résistance au poinçonnement et à l'orniérage, la rigidité et la résistance à la fatigue. Par ailleurs, le brevet européen EP-0605377 décrit des compositions asphaltiques pour la préparation d'enrobés drainants, comprenant un premier modifiant choisi parmi les copolymères styrène-butadiène ou styrène-isoprène, leurs mélanges et les pneus recyclés, et un deuxième modifiant choisi parmi les polyoléfines, le polyethylène terephtalate et leurs mélanges. Ces additifs permettent d'augmenter la résistance à la fatigue, la résistance à la déformation permanente, ainsi que les propriétés ad hésives et cohésives.More particularly, the subject of the present invention is a process for increasing the resistance to chemical aggressions of bituminous mixes, in particular those linked to leaks or spills of petroleum liquids, and which leads to mixes which are neither toxic nor susceptible to contain carcinogens. Those skilled in the art know the use of polymer type additives for improving the mechanical properties of bituminous binders or bituminous mixes. Thus, French patent application FR-2753210 describes a bituminous mix for road surfacing based on bitumen modified by polymers and in which polyethylene has been added. Thanks to such a coating, it was possible to improve the water and frost resistance, the resistance to punching and rutting, the rigidity and the resistance to fatigue. Furthermore, European patent EP-0605377 describes asphaltic compositions for the preparation of draining mixes, comprising a first modifier chosen from styrene-butadiene or styrene-isoprene copolymers, their blends and recycled tires, and a second modifier chosen from polyolefins, polyethylene terephthalate and their mixtures. These additives make it possible to increase the resistance to fatigue, the resistance to permanent deformation, as well as the hesitant and cohesive properties.
A titre de documents illustratifs de la technique antérieure, on peut également citer la norme N F EN 12591 et le document "Guide Technique : emploi des liants modifiés, des bitumes spéciaux et des bitumes avec additifs en techniques routières", publié par le Laboratoire Central des Ponts et Chaussées LCPC (ISSN 1 151 - 1516 ISBN 2-7208-7140-4), ci-après désigné par référence 1 .As illustrative documents of the prior art, one can also cite the standard NF EN 12591 and the document "Technical Guide: use of modified binders, special bitumens and bitumens with additives in road techniques", published by the Central Laboratory Ponts et Chaussées LCPC (ISSN 1 151 - 1516 ISBN 2-7208-7140-4), hereinafter designated by reference 1.
D'après ce document, ces bitumes peuvent être modifiés par des terpolymères, comme par exemple le composé d'une chaîne éthylénique avec des groupements fonctionnels d'acrylate de butyle et de glycidyl acrylate de méthyle qui assure une bonne stabilité au mélange bitume/polymère, ainsi que des élastomères et des plastomères permettant une amélioration importante des résistances à la fissuration et à l'orniérage.According to this document, these bitumens can be modified by terpolymers, such as for example the compound of an ethylenic chain with functional groups of butyl acrylate and methyl glycidyl acrylate which ensures good stability to the bitumen / polymer mixture , as well as elastomers and plastomers allowing a significant improvement in resistance to cracking and rutting.
En complément des polymères présentés précédemment et d'après la référence 1 « Guide Technique: emploi des liants modifiés, des bitumes spéciaux et des bitumes avec additifs en techniques routières » cité précédemment, on peut également modifier les bitumes par le chlorure de polyvinyle (PVC), d'autres copolymères à base de styrène et de butadiène, ou d'éthylène et d'acétate de vinyle (EVA).In addition to the polymers presented above and according to reference 1 "Technical Guide: use of modified binders, special bitumens and bitumens with additives in road engineering" cited above, it is also possible modify bitumens with polyvinyl chloride (PVC), other copolymers based on styrene and butadiene, or ethylene and vinyl acetate (EVA).
On a maintenant trouvé qu'il était possible d'améliorer la résistance aux agressions chimiques des enrobés bitumineux, sans risque de pollution , en ajoutant à des enrobés bitumineux une quantité déterminée de polyoléfines.It has now been found that it is possible to improve the resistance to chemical aggressions of bituminous mixes, without risk of pollution, by adding to bituminous mixes a determined quantity of polyolefins.
Le but de l'invention concerne donc un procédé pour améliorer la résistance aux agressions chimiques d'un enrobé bitumineux pour revêtement routier comprenant un liant bitumineux et des granulats, caractérisé en ce qu'il consiste à ajouter à l'enrobé bitumineux 1 à 5 % en poids d'au moins une polyoléfine et de préférence 1 à 2 % en poids par rapport au poids des granulats, pour obtenir un enrobé bitumineux modifié ayant un taux de compacité supérieur ou égal à 97%.The object of the invention therefore relates to a method for improving the resistance to chemical attack of a bituminous mix for road surfaces comprising a bituminous binder and aggregates, characterized in that it consists in adding to the bituminous mix 1 to 5 % by weight of at least one polyolefin and preferably 1 to 2% by weight relative to the weight of the aggregates, to obtain a modified bituminous mix having a compactness ratio greater than or equal to 97%.
De préférence, les produits chimiques de type fluxant ou solvant pétrochimique sont particulièrement agressifs vis à vis des enrobés bitumineux. On appelle anti-kérosène ou anti-K, la capacité de l'enrobé à résister à ces agressions. Le caractère anti- K sera plus ou moins marqué suivant la composition de l'enrobé.Preferably, chemicals of the fluxing type or petrochemical solvent are particularly aggressive with respect to bituminous mixes. The ability of the mix to resist these attacks is called anti-kerosene or anti-K. The anti-K character will be more or less marked depending on the composition of the mix.
Généralement, le bitume de la composition selon l'invention est un bitume modifié par des polymères, les bitumes modifiés par des polymères étant définis au sens du document "Guide Technique: emploi des liants modifiés, des bitumes spéciaux et des bitumes avec additifs en techniques routières" cité précédemment. Les polymères sont avantageusement choisis parmi les copolymères styrène-butadiène ou styrène-isoprène et leurs mélanges ou les terpolymères.Generally, the bitumen of the composition according to the invention is a bitumen modified by polymers, the bitumens modified by polymers being defined within the meaning of the document "Technical Guide: use of modified binders, special bitumens and bitumens with additives in techniques "previously mentioned. The polymers are advantageously chosen from styrene-butadiene or styrene-isoprene copolymers and their mixtures or terpolymers.
De façon avantageuse, l'enrobé bitumineux comprend 3 à 1 1 , de préférence 5 à 1 1 % en poids de liant bitumineux par rapport au poids des granulats.Advantageously, the bituminous mix comprises 3 to 1 1, preferably 5 to 1 1% by weight of bituminous binder relative to the weight of the aggregates.
Selon autre caractéristique, la granulométrie des granulats est choisie dans la gamme 0/Dmax, Dmax étant le diamètre maximal du granulat tel que défini selon la norme XP P 1 8-540, et allant de 4 à 25 mm. La polyoléfine est avantageusement un polyethylène, un polypropylène ou un mélange des deux. La polyoléfine peut être vierge, c'est-à-dire venant directement de la fabrication ind ustrielle, ou de récupération, c'est-à-dire obtenu par recyclage d'objets usagés ou de rebuts de fabrication comprenant des polyoléfines.According to another characteristic, the granulometry of the aggregates is chosen from the range 0 / Dmax, Dmax being the maximum diameter of the aggregate as defined according to standard XP P 1 8-540, and going from 4 to 25 mm. The polyolefin is advantageously a polyethylene, a polypropylene or a mixture of the two. The polyolefin may be virgin, that is to say coming directly from industrial production, or from recovery, that is to say obtained by recycling used objects or manufacturing waste comprising polyolefins.
Dans une forme de réalisation particulière, la polyoléfine, le liant bitumineux et les granulats sont malaxés pour former l'enrobé bitumineux modifié. De manière avantageuse, le malaxage s'effectue à une température de 140 à 190°C, et de préférence de 160 à 190°C.In a particular embodiment, the polyolefin, the bituminous binder and the aggregates are kneaded to form the modified bituminous mix. Advantageously, the kneading takes place at a temperature of 140 to 190 ° C, and preferably from 160 to 190 ° C.
Les enrobés bitumineux obtenus selon la présente invention ont un rapport Rchydrocarburei β'c/Rcair-i s-c supérieur ou égal à 0,70, où Rchydrocarburei 8°c est la résistance à la compression à 1 8°C après immersion pendant une semaine dans un bain d'hydrocarbure à 18°C et Rcair18°c la résistance à la compression à 1 8°C dans l'air.The bituminous mixes obtained according to the present invention have a Rchydrocarburei β'c / Rcair-i sc ratio greater than or equal to 0.70, where Rchydrocarburei 8 ° c is the compressive strength at 1 8 ° C after immersion for one week in a hydrocarbon bath at 18 ° C and Rcair 18 ° c the compressive strength at 18 ° C in air.
En outre, le taux de compacité des enrobés bitumineux selon l'invention, ou encore enrobés bitumineux modifiés, mesuré selon la norme NF P 98 250-6 est supérieur ou égal à 97%.In addition, the compactness ratio of bituminous mixes according to the invention, or else modified bituminous mixes, measured according to standard NF P 98 250-6 is greater than or equal to 97%.
L'enrobé bitumineux, fabriqué en utilisant le procédé selon l'invention, peut être utilisé sur des chaussées avec un fort potentiel de recevoir un déversement accidentel d'hydrocarbures, des chaussées routières, des chaussées aéronautiques, des pistes de chars et des voiries militaires, ainsi que sur des plates-formes et voiries industrielles et aussi sur des voies de bus et voies de tramways sur pneumatiques.Bituminous mix, manufactured using the process according to the invention, can be used on pavements with a high potential for receiving an accidental oil spill, road pavements, aeronautical pavements, tank tracks and military roads. , as well as on industrial platforms and roads and also on bus tracks and tram tracks on tires.
Son principal avantage est une meilleure résistance aux agressions chimiques, notamment celles créées par des liquides pétroliers (de type fluxant ou solvant pétrochimique).Its main advantage is better resistance to chemical attack, especially those created by petroleum liquids (fluxing type or petrochemical solvent).
Les exemples suivants illustrent l'invention sans toutefois en limiter la portée. 1. Matières premières Préparation des échantillonsThe following examples illustrate the invention without, however, limiting its scope. 1. Raw materials Preparation of samples
Liants des enrobés bitumineuxBituminous mix binders
- bitume 50/70, ou - bitume 70/100, ou- bitumen 50/70, or - bitumen 70/100, or
- bitume 180/220- bitumen 180/220
Liants des enrobés à base de goudron de houille (liant de l'art antérieur)Coal tar mix binders (prior art binder)
- goudron de houille STAVOJET® Granulats- STAVOJET® Aggregate coal tar
- granulats en provenance de La Noubleau sélectionnés pour obtenir la reconstitution granulométrique suivante:- aggregates from La Noubleau selected to obtain the following particle size reconstitution:
- classe 0/2: de 40 à 46 parties- class 0/2: from 40 to 46 parts
- classe 2/4: de 10 à 15 parties - classe 4/6: de 15 à 25 parties- class 2/4: from 10 to 15 parts - class 4/6: from 15 to 25 parts
- classe 6/10: de 15 à 25 parties- class 6/10: from 15 to 25 games
- fi Mer calcaire: de 1 à 3 parties Polyoléfine: polyethylène de basse densité, présenté sous forme de lentilles 0/4 mm- fi Limestone sea: from 1 to 3 parts Polyolefin: low density polyethylene, presented in the form of 0/4 mm lenses
Bain d'hydrocarbureHydrocarbon bath
• Pétrole Exxsol D80 de la société EXXON• Exxsol D80 oil from EXXON
2. Méthodes de mesure Résistance à la compression dans l'air La résistance à la compression à l'air, est déterminée en réalisant des essais de compression suivant la norme DU RIEZ NF P 98-251 -1 :2. Measurement methods Resistance to compression in air The resistance to compression in air is determined by carrying out compression tests according to the standard DU RIEZ NF P 98-251 -1:
- dans l'air après sept jours à 18°C et 50% d'hygrométrie: Rcairι 8°c- in the air after seven days at 18 ° C and 50% humidity: Rcairι 8 ° c
- dans l'air à 50°C après sept jours à 50°C à 50% d'hygrométrie : Rcair5o°c- in air at 50 ° C after seven days at 50 ° C at 50% humidity: Rcair 5 o ° c
Résistance à la compression après immersion dans un bain d'hydrocarbure à 18°CCompressive strength after immersion in a hydrocarbon bath at 18 ° C
La résistance à la compression après immersion dans le bain de pétrole Exxsol D80 à 18°C, notée Rchydrocarbureι8°c, est également déterminée en réalisant des essais de compression suivant la norme NF P 98-251 -1 . Pour cette détermination, les éprouvettes DU RI EZ sont préalablement à l'essai de caractérisation mécanique, immergées complètement pendant une semaine dans un bain de pétrole à une température de 18°C.The compressive strength after immersion in the Exxsol D80 oil bath at 18 ° C, denoted Rchydrocarbureι 8 ° c, is also determined by carrying out compression tests according to standard NF P 98-251-1. For this determination, the DU RI EZ test pieces are prior to the mechanical characterization test, completely immersed for one week in an oil bath at a temperature of 18 ° C.
A partir des valeurs de résistances à la compression Rcairι8°c et Rchydrocarbureι 8°c mesurées, on calcule le rapport Rckérosène18°C/Rcairi8°c afin d'estimer le degré de conservation de la résistance à la compression d'un enrobé bitumineux après immersion complète dans un agent agressif tel que le pétrole Exxsol D80. Le rapport Rchydrocarbureιa°c/Rcair18°c est représentatif du caractère anti-K de l'enrobé bitumineux. Plus la valeur de ce rapport se rapproche de 1 , plus le caractère anti-K de l'enrobé sera marqué, ou encore plus la résistance à l'agression chimique causée par le pétrole sera élevée. CompacitéFrom the values of resistance to compression Rcairι 8 ° c and Rchocarocarbureι 8 ° c measured, the ratio Rckérosène18 ° C / Rcairi8 ° c is calculated in order to estimate the degree of conservation of the compression resistance of a bituminous mix after complete immersion in an aggressive agent such as petroleum Exxsol D80. The ratio Rchydrocarbureιa ° c / Rcair 18 ° c is representative of the anti-K character of the bituminous mix. The closer the value of this ratio is to 1, the more marked the anti-K character of the mix, or the higher the resistance to chemical aggression caused by petroleum. compactness
La compacité est mesurée selon la norme NF P 98 250-6. Il s'agit d'une mesure de la masse volumique apparente d'une éprouvette par pesée hydrostatique.The compactness is measured according to standard NF P 98 250-6. It is a measurement of the apparent density of a test piece by hydrostatic weighing.
Dans les exemples, sauf indication contraire, toutes les quantités sont exprimées en parties en poids pour 100 parties en poids de granulats.In the examples, unless otherwise indicated, all the quantities are expressed in parts by weight per 100 parts by weight of aggregates.
ExemplesExamples
On a préparé un premier enrobé bitumineux selon l'invention (EB 1 ), en mélangeant, à 100 parties de granulats, 6 parties d'un bitume 70/100 pendant 4 minutes à 180°C. Puis, on ajoute à l'enrobé obtenu 1 ,5 parties d'un polyethylène et on malaxe le tout pendant 8 minutes pour bien homogénéiser.A first bituminous mix was prepared according to the invention (EB 1), by mixing, with 100 parts of aggregates, 6 parts of a 70/100 bitumen for 4 minutes at 180 ° C. Then, 1.5 parts of a polyethylene are added to the mix obtained and kneaded for 8 minutes to homogenize well.
On a préparé un deuxième enrobé bitumineux selon l'invention (EB2), en mélangeant, à 100 parties de granulats, 6 parties d'un bitume 180/220 pendant 4 minutes à 1 50°C. Puis, on ajoute à l'enrobé obtenu 1 ,2 parties d'un polyethylène et on malaxe le tout pendant 8 minutes pour bien homogénéiser.A second bituminous mix was prepared according to the invention (EB2), by mixing, with 100 parts of aggregates, 6 parts of a 180/220 bitumen for 4 minutes at 150 ° C. Then, 1 to 2 parts of a polyethylene are added to the mix obtained and the whole is kneaded for 8 minutes to homogenize well.
On a préparé un troisième enrobé bitumineux selon l'invention (EB3), en mélangeant, à 100 parties de granulats, 6 parties d'un bitume modifié 50/70 à base de polymères ou de terpolymères, et 1 ,5 parties d'un polyethylène en forme de cire, et on malaxe le tout pendant 4 minutes à 180°C pour bien homogénéiser.A third bituminous mix according to the invention was prepared (EB3), by mixing, with 100 parts of aggregates, 6 parts of a 50/70 modified bitumen based on polymers or terpolymers, and 1.5 parts of a wax-shaped polyethylene, and the whole is kneaded for 4 minutes at 180 ° C. to homogenize well.
On a également préparé à titre de témoins, des enrobés bitumineux T1 et T2, ne comportant ni polyethylène, ni polymères : - l'enrobé bitumineux T1 a été obtenu, en ajoutant 6 parties en poids d'un bitume 50/70 à 100 parties en poids de granulats, puis en malaxant le tout pendant 4 minutes à 150°C,Also prepared as controls, bituminous mixes T1 and T2, containing neither polyethylene nor polymers: - bituminous mix T1 was obtained, by adding 6 parts by weight of a bitumen 50/70 to 100 parts by weight of aggregates, then kneading everything for 4 minutes at 150 ° C.,
- l'enrobé bitumineux T2 a été obtenu, en ajoutant 7,5 parties du goudron de houille STAVOJET® à 100 parties de granulats, puis en malaxant le tout pendant 4 minutes à 150°C.- the bituminous mix T2 was obtained, by adding 7.5 parts of STAVOJET® coal tar to 100 parts of aggregates, then mixing everything for 4 minutes at 150 ° C.
Pour chaque béton bitumineux, T1 et T2 d'une part, et EB1 à EB3 d'autre part, on mesure:For each bituminous concrete, T1 and T2 on the one hand, and EB1 to EB3 on the other hand, we measure:
- la résistance à la compression à l'air à 1 8°C Rcair18°c sur une partie des échantillons, - la résistance à la compression à l'air à 50°C Rcairstrc sur une seconde partie des échantillons,- the air compression resistance at 18 ° C Rcair 18 ° c on part of the samples, - the air compression resistance at 50 ° C Rcairs t rc on a second part of the samples,
- la résistance à la compression après immersion dans un bain de pétrole Exxsol D80 Rchydrocarbureι8°c sur la partie restante des échantillons, - la compacité hydrostatique mesurée par la méthode hydrostatique décrite dans les normes N F P 98-251 -1 et N F P 98-250-6.- the compressive strength after immersion in a petroleum bath Exxsol D80 Rchydrocarbureι 8 ° c on the remaining part of the samples, - the hydrostatic compactness measured by the hydrostatic method described in standards NFP 98-251-1 and NFP 98-250 -6.
Les résultats sont présentés ci-après dans le tableau 1 . The results are presented below in Table 1.
TABLEAU 1TABLE 1
Les performances mécaniques des enrobés bitumineux, fabriqués en utilisant le procédé selon l'invention (EB 1 , EB2 et EB3) et ayant subi une agression chimique, sont meilleures que celles de l'enrobé T1 ne contenant ni polyethylène, ni polymères.The mechanical performance of bituminous mixes, manufactured using the process according to the invention (EB 1, EB2 and EB3) and having undergone chemical attack, are better than those of the T1 mix containing neither polyethylene nor polymers.
En effet, les enrobés bitumineux EB1 , EB2 et EB3 conservent plus de 75 % de leur résistance mécanique en compression après une immersion complète d'une semaine dans un bain de pétrole (Exxsol D80®), tandis que l'enrobé bitumineux T1 n'en conserve que 18 %.In fact, the bituminous mixes EB1, EB2 and EB3 retain more than 75% of their mechanical resistance in compression after a full immersion of one week in an oil bath (Exxsol D80®), while the bituminous mix T1 does not canned only 18%.
Les performances mécaniques Rcairι 8°c etMechanical performance Rcairι 8 ° c and
Rchydrocarburei8°c des enrobés EB1 à EB3 sont inférieures à celles de l'enrobé T2, pour lequel le liant est un goudron de houille mais du même ordre de grandeur que le témoin T1 . Les valeurs de Rchydrocarbureι 8°c/Rcair1 8°c montrent que les enrobés bitumineux EB 1 , EB2 et EB3 ont un caractère anti-K relativement proche de celui de l'enrobé T2, avec une amélioration très sensible de la résistance à 50°C dans l'air. The hydrocarbon content of the asphalt mixes EB1 to EB3 are lower than those of the asphalt mix T2, for which the binder is a coal tar but of the same order of magnitude as the control T1. The values of Rchydrocarbureι 8 ° c / Rcair 1 8 ° c show that the bituminous mixes EB 1, EB2 and EB3 have an anti-K character relatively close to that of the mix asphalt T2, with a very significant improvement in the resistance to 50 ° C in the air.

Claims

REVEN D ICATIONS REVEN D ICATIONS
1 . Procédé pour améliorer la résistance aux agressions chimiques d'un enrobé bitumineux pour revêtement routier, comprenant un liant bitumineux et des granulats, caractérisé en ce qu'il consiste à ajouter à l'enrobé bitumineux 1 à 5 % en poids, et de préférence 1 à 2 % en poids, d'au moins une polyoléfine par rapport au poids des granulats pour obtenir un enrobé bitumineux modifié, et également caractérisé en ce que l'enrobé bitumineux modifié présente un taux de compacité égal ou supérieur à 97 % et un rapport Rchydrocarbureι8°c / Rcair18°c égal ou supérieur à 0,70 où :1. Process for improving the resistance to chemical attack by a bituminous mix for road surfaces, comprising a bituminous binder and aggregates, characterized in that it consists in adding to the bituminous mix 1 to 5% by weight, and preferably 1 at 2% by weight, of at least one polyolefin relative to the weight of the aggregates in order to obtain a modified bituminous mix, and also characterized in that the modified bituminous mix has a compactness ratio equal to or greater than 97% and a ratio Hydrocarbon 8 ° c / Rcair 18 ° c equal to or greater than 0.70 where:
- Rchydrocarbure^c est la résistance à la compression après immersion pendant une semaine dans un bain d'hydrocarbure à- The hydrocarbon ^ c is the compressive strength after immersion for one week in a hydrocarbon bath at
1 8°C, et1 8 ° C, and
- Rcairι8=c est la résistance à la compression dans l'air à 18°C.- Rcairι 8 = c is the compressive strength in air at 18 ° C.
2. Procédé selon la revendication 1 , caractérisé en ce que la polyoléfine est un polyethylène, un polypropylene ou un mélange des deux, vierges ou de recyclage.2. Method according to claim 1, characterized in that the polyolefin is a polyethylene, a polypropylene or a mixture of the two, virgin or of recycling.
3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le liant bitumineux est un bitume modifié par des polymères, tels que définis selon la norme NF EN 12491 et le "Guide Technique: emploi des liants modifiés, des bitumes spéciaux et des bitumes avec add itifs en techniques routières", publié par le Laboratoire Central des Ponts et Chaussées LCPC (ISSN 1 151 - 1516 ISBN 2-7208-7140-4).3. Method according to any one of the preceding claims, characterized in that the bituminous binder is a bitumen modified by polymers, as defined according to standard NF EN 12491 and the "Technical Guide: use of modified binders, special bitumens and bitumens with additives in road techniques ", published by the Laboratoire Central des Ponts et Chaussées LCPC (ISSN 1 151 - 1516 ISBN 2-7208-7140-4).
4. Procédé selon la revendication 3, caractérisé en ce que les polymères sont choisis parmi les copolymères styrène- butadiène ou styrène-isoprène, les terpolymères et leurs mélanges.4. Method according to claim 3, characterized in that the polymers are chosen from styrene-butadiene or styrene-isoprene copolymers, terpolymers and their mixtures.
5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'enrobé bitumineux comprend 3 à 1 1 %, de préférence 5 à 1 1 % en poids de liant bitumineux par rapport au poids des granulats. 5. Method according to any one of the preceding claims, characterized in that the bituminous mix comprises 3 to 1 1%, preferably 5 to 1 1% by weight of bituminous binder relative to the weight of the aggregates.
6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le malaxage s'effectue à une température comprise entre 140 et 190°C, et de préférence comprise entre 160 et 190°C. 6. Method according to any one of the preceding claims, characterized in that the kneading is carried out at a temperature between 140 and 190 ° C, and preferably between 160 and 190 ° C.
EP01994916A 2000-12-19 2001-12-19 Method for enhancing resistance of a bituminous mix to chemical attacks Withdrawn EP1358271A1 (en)

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FR0016604A FR2818273B1 (en) 2000-12-19 2000-12-19 PROCESS FOR IMPROVING RESISTANCE TO CHEMICAL AGRESSIONS OF A BITUMINOUS SPRAY
PCT/FR2001/004082 WO2002050188A1 (en) 2000-12-19 2001-12-19 Method for enhancing resistance of a bituminous mix to chemical attacks

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BE1006339A3 (en) 1992-11-12 1994-07-26 Fina Research COMPOSITION porous asphalt.
FR2753210B1 (en) * 1996-09-12 1999-01-08 Colas Sa BITUMINOUS COATING CONTAINING POLYMERS AND POLYETHYLENE
FR2774090B1 (en) * 1998-01-29 2000-04-07 Smac Acieroid NATURALLY ROUGH SURFACE ASPHALT AND APPLICATIONS IN PARTICULAR TO TRAFFIC COVERINGS

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