AU2010212716B2 - System of additives for the preparation of a warm mix for road use based on an amine-type surfactant - Google Patents

Abstract

The present invention relates to a system of additives for the preparation of a warm mix for road use comprising: one or more components (A) chosen from adhesion dopes, and one or more components (B) chosen from ethoxylated fatty (poly)amines and ethoxylated fatty amido(poly)amines. The invention also relates to the hydrocarbon-based binder and the bituminous mixes comprising said system of additives.

Description

1 SYSTEM OF ADDITIVES FOR THE PREPARATION OF A WARM MIX FOR ROAD USE BASED ON AN AMINE-TYPE SURFACTANT The present invention relates to an additive system based on surfactant of the amidoamine or amine type used to prepare hot applied bitumen mixtures with low 5 production temperature such as warm mix asphalts. The invention also relates to a hydrocarbon binder and to asphalt mixes comprising said additive system, and their method of preparation. In the invention, the term "bitumen mixture" is used to designate aggregates mixed with a hydrocarbon binder such as bitumen or synthetic binders based on raw 0 materials of petroleum origin or derived from biomass, and used for or the production of a layer and/or coating for road construction and/or civil engineering. Bitumen is the main hydrocarbon binder used in the field of road building or civil engineering. It may be used pure or modified by adding polymers, in which case it is known as modified bitumen. 5 The hydrocarbon binders used as road binders are too viscous at ambient temperature to present suitable workability or indeed wettability relative to aggregate. There exist various ways of making bitumen or modified bitumen workable: either by heating as a function of its viscosity, or by placing it in an emulsion, or indeed by lowering its viscosity by mixing it with solvents or fluxes. 0 In the context of building and maintaining roads, the bitumen asphalt mixes that are currently in use come under two main categories: cold asphalt mixes and hot asphalt mixes. Cold asphalt mixes are fabricated and cold laid at a temperature that generally ranges from 20"C to 80*C, and they are preferably used for preventative and curative road maintenance. Hot asphalt mixes are prepared at a temperature that 5 generally ranges from 1OOC to 250"C and they are laid at a temperature that generally ranges from 100*C to 150"C, and they are commonly used for preparing wearing courses. The term "warm" is used in the manner of the road-building profession (see for example the technical journal Travaux No. 848, January 2008 - Energy-saving j environmental asphalt mixes). The term "warm asphalt mix" is used to designate an asphalt mix comprising a hydrocarbon binder and an additive system that due to the presence of a particular additive system, is capable of being prepared and laid at temperatures that are 30"C to 50 0 C lower than the temperatures that are traditionally needed for preparing and laying an asphalt mix having the same hydrocarbon binder 5 without additive. The preparation of a bitumen mixture of the above-mentioned type comprises mixing the binder and the filler or aggregate at a "preparation" temperature. Such preparation is followed by spreading the mixture at a laying temperature, compacting 2 the spread mixture should that be necessary, and finally allowing the compacted mixture to warm. The preparation temperatures of mixtures vary depending on the nature of the hydrocarbon binder and more particularly as a function of the class of bitumen that is 5 used. Bitumens may be classified depending on their penetration class. Each class or grade corresponds to a range of penetration measurements. Bitumens are hard when they have low penetration values and bitumens are soft when they have relatively high penetration values. For traditional hot bitumen asphalt mixes, the mixing temperatures of the 0 aggregate and the hydrocarbon binder comprising a pure bitumen conventionally presenting 35/50 penetration generally range from 140"C to 1650C, or indeed 150*C to 1750C when weather conditions are harsher. When using a binder of lower penetration, the mixing temperatures tend towards the higher values of those ranges. Several problems are associated with the high temperatures needed for 5 preparing and laying hot asphalt mixes. In particular they give rise to high levels of energy consumption and they emit large quantities of greenhouse gases. The use of hot asphalt mixes can also represent a health risk for workers, and can be troublesome for frontagers, unless special precautions are taken. Studies have been made in order to develop modified binders that enable asphalt 0 mixes to be prepared at a lower preparation temperature, in particular as a result of adding various additives such as fluxes, organic compounds of a paraffin nature, or hydrocarbon waxes. By way of example, patent application FR 2 901 801 discloses bitumen compounds, and mixtures of such bitumen compounds with aggregates, that are 5 suitable for use in particular in the field of building and maintaining road coverings. It is specified that adding additives in the bitumen composition and mixing it with aggregates with the help of chemical additives make it possible to lower the production temperature of mixtures of aggregates and bitumen composition by 20"C to 40*C without degrading the properties of the bitumen composition or of the mixing between the bitumen 0 composition and the aggregate. The additives necessarily include at least one additive designed A or Al. The additive A comprises a copolymer of ethylene oxide and propylene oxide, and the additive Al satisfies the following chemical formula: R-0-((CH2CH(CH 3 )O)a-(CH 2

CH

2 0)b)P(=0)-OHd. Nevertheless, the various techniques used in the past for increasing the 5 workability of binders or reducing the preparation temperature of asphalt mixes do not enable the sufficiently lower the preparation temperature of hot asphalt mixes and/or do not enable the mechanical properties of the resulting compositions to be conserved. There thus exists a need for a solution that enables to low the preparation and laying temperature of warm asphalt mixes while presenting utilization properties and 3 mechanical properties for the finished products that are at least similar if not improved relative to those of hot asphalt mixes that are fabricated and laid in conventional manner. In addition, this lowering of temperature must not give rise to a major 5 modification to the traditional techniques used with hot asphalt mixes, whether they be preparation processes or laying processes. Summary of Invention 10 Surprisingly, the invention enables the preparation and laying temperature of hot asphalt mixes to be lowered by adding a particular additive system to the basic bitumen used for formulating the bitumen asphalt mix. This reduction may be by as much as 50*C. The present invention thus provides an additive system for preparing warm 15 asphalt mix for road use, the system comprising: - one or more components (A) selected from the group of the group of adhesion dopes which are selected from the group of alkylamidopolyamines, alkylimidazolines, and alkylimidazopolyamines, which are the products of reaction between a polyamide (C) and a fatty carboxylic acid; fatty chain alkylpolyamines; 20 the products of reaction between a polyamine (C) and the products of reaction of a fatty carboxylic acid or a vegetable oil with diethanolamine; said polyamine (C) is preferably a polyaklylene-polyamine, for examples, dimethylaminopropylamine, N-aminoethylpiperazine, diethylenetriamine, triethylenetetraamine, or tetraethylenepentaamine; and 25 - one or more components (B) selected from the group of ethoxylated fatty (poly)amines and ethoxylated fatty amido(poly) amines satisfying following formula 1 or 2: R-N -4H2-N-) CH 2

CH

2 O)-H HdOCH 2 CH2 (CH 2

CH

2 0-)j-H 30 Formula 1 R'-CO-NCH2-N9-CH 2

CH

2 OkH H (CH 2

CH

2 O-H Formula 2 3a wherein: - R and R' represent a C8 to C24 hydrocarbon radical, preferably an alkyl, a C8 to C22 alkenyl, or a mixture thereof; - v and V are integers greater than or equal to 1, preferably ranging from 1 to 6, 5 and more preferably v and v' are equal to 3; - w is an integer greater than or equal to 0, preferably ranging from 0 to 5, more preferably ranging from 0 to 3; - w' is an integer greater than or equal to 1, preferably ranging from 1 to 5, better still ranging from 1 to 3; 10 - x, y, and z are integers selected so that the sum (x+y+z) is greater than 3, preferably ranging from 3 to 20, and better equal to 15; and - y' and z' are integers selected such that the sum (y'+z') ranges from 1 to 1000, is preferably greater than 3, preferably ranges from 3 to 20, and better still is equal to 15. 15 Description of Preferred Embodiments The term "comprises" or "comprising" are grammatical variations thereof when used in this specification are to be taken to specify the presence of stated 20 features, integers, steps or components or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. The term "additive system" is used in the invention to mean all of the additives for adding to the hydrocarbon binder. The additive system of the 25 invention may be constituted by compounds (A) and (B) on their own or in a mixture with several other additives. In the invention, the term "(poly)amine" covers amines having one amine group and polyamines having at least two amine groups. In the invention, the term "amido(poly)amine" covers amidoamines having 30 one amine group and amidopolyamines having at least two amine groups. The invention also provides a hydrocarbon binder for making courses and/or surfacing in road building and/or civil engineering, and comprising the above-described additive system. The invention also provides a bitumen mixture such as a warm asphalt mix 35 for road use comprising an aggregate and the above-described hydrocarbon binder. Finally, the invention provides a method of preparing said bitumen mixture or bitumen asphalt mix.

3b In an advantageous embodiment, the additive system of the invention further comprises the following characteristics taken alone or in combination: - the component(s) (B) is/are constituted exclusively by ethoxylated fatty (poly)amines or by ethoxylated fatty amido(poly)amines; 5 - the component(s) (B) satisfy following formula 1 or 2: R-N(H2 N-Y(CH 2

CH

2 O)-H HdOCH 2 CH2 (CH 2

CH

2 Oj-H Formula 1 10 4 R'-CO-NYCH-Nj CH 2

CH

2 O)rH H (CH 2

CH

2 0o-H Formula 2 wherein: 5 - R and R' represent a C 8 to C24 hydrocarbon radical, preferably an alkyl, a C8 to C22 alkenyl, or a mixture thereof; - v and v' are integers greater than or equal to 1, preferably ranging from 1 to 6, and more preferably v and v' are equal to 3; - w is an integer greater than or equal to 0, preferably ranging from 0 to 5, more 0 preferably ranging from 0 to 3; - w' is an integer greater than or equal to 1, preferably ranging from 1 to 5, better still ranging from 1 to 3; - x, y, and z are integers selected so that the sum (x+y+z) ranges from 1 to 1000, preferably is greater than 3, preferably ranging from 3 to 20, and better equal to 5 15; and - y' and z' are integers selected such that the sum (y'+z') ranges from 1 to 1000, is preferably is greater than 3, preferably ranges from 3 to 20, and better still is equal to 15; - said ethoxylated fatty (poly)amines are selected from the group of ethoxylated fatty 0 monoamines, diamines, triamines, and tetraamines, preferably from ethoxylated fatty diamines satisfying the following formula B1: R-N-H2kN--(CH 2

CH

2 OkH HdOCH 2

CH

2 ) (CH 2

CH

2 o-H where R represents a linear or branched, saturated or unsaturated hydrocarbon chain and x, y, and z are integers selected such that the sum (x+y+z) ranges from 1 to 1000, 5 is preferably greater than 3, preferably ranging from 3 to 20, and better still is equal to 15; - said ethoxylated fatty amido(poly)amines are selected from the group of ethoxylated fatty amidomonoamines, amidodiamines, and amidotriamines, preferably from ethoxylated fatty amidomonoamines satisfying the following formula B2: R'-CO-N-CH IN ---- (0HCH 2 OgH H (CH 2

CH

2 0-)H where R' represents a linear or branched, saturated or unsaturated hydrocarbon chain, and y' and z' are integers selected such that the sum (y'+z') ranges from 1 to 1000, is preferably greater than 3, preferably ranges from 3 to 20, and better is equal to 15; 5 - the groups R or R' represent a C8 to C18 hydrocarbon radical, preferably comprising C18 unsaturated alkyl chains; - the component(s) B is/are derived from a fatty acid of animal origin, in particular tallow; - the R or R' groups are derived from natural fats and oils such as tallow, rapeseed oil, 5 soya oil, tall oil, and preferably R or R' represents a tallow alkyl; - said adhesion dopes are selected from the group of alkylamidopolyamines, alkylimidazolines, and alkylimidazopolyamines, which are the products of reaction between a polyamide (C) and a fatty carboxylic acid; fatty chain alkylpolyamines; the products of reaction between a polyamine (C) and the products of reaction of a fatty 0 carboxylic acid or a vegetable oil with diethanolamine; - said polyamine (C) is preferably a polyaklylene-polyamine, for exeamples dimethylaminopropylamine, N-aminoethylpiperazine, diethylenetriamine, triethylenetetraamine, or tetraethylenepentaamine; - the polyamine (C) is not ethoxylated; 5 - the adhesion dopes are selected from the group of the products of reacting a fatty acid, preferably tall oil or rapeseed oil fatty acid, with a polyamine (C), preferably of the polyethylene polyamine type and better still tetraethylene pentaamine; and - the additive system comprises 10% to 70%, preferably 10% to 50% by weight of the component(s) A and 30% to 90%, preferably 50% to 90% by weight of the 0 component(s) B relative to the total weight of the additive system. In an advantageous embodiment, the hydrocarbon binder of the invention also comprises the following characteristics singly or in combination: - the hydrocarbon binder preferably being a pure bitumen; and - the additive system represents 0.1% to 2% by weight, preferably 0.3% to 0.6% by 5 weight, relative to the total weight of the hydrocarbon binder. In the invention, the term "exclusively constituted by" means constituted by at least 95%, preferably at least 99%, better still 100% by weight. Adhesion dopes are chemical compositions that, when present in very small quantity improve adhesion between a hydrocarbon binder and aggregates, in particular D when wet. Adhesion dopes are thus surfactants that modify the wetting of aggregates by the binder and improve bonding there between. Preferred adhesive dopes are selected from the group of alkylamidopolyamines, alkylimidazolines, and alkylimidazopolyamines, which are the products of reaction between a polyamide and a fatty carboxylic acid; fatty chain alkylpolyamines; the 5 products of reaction between a polyamine and the products of reaction between a fatty carboxylic acid or a vegetable oil with diethanolamine; said polyamine being constituted, for example, by dimethylaminopropylamine, N-aminoethylpiperazine, diethylenetriamine, triethylenetetraamine, or tetraethylenepentaamine.

6 Fatty amidoamines are usually linear but they can equally well exist in imidazoline form (ethylene amines) or tetrahydropyrimidine form (propylene amines). The adhesion dopes may be selected from the group of alkylamidopolyamines excluding ethoxylated fatty chain amido(poly)amines. The adhesion dopes may also be 2 selected from the group of fatty chain alkylpolyamines, excluding ethoxylated fatty chain polyamines. The compounds B of the invention form part of the amine surfactant category, Nevertheless, these substances do not have properties that are good for being used as adhesion dopes. In the invention, these substances are therefore not considered for ) use as adhesion dopes. The invention also provides a method of preparing a bitumen mixture such as a warm asphalt mix comprising mineral aggregates coated in a hydrocarbon binder, the method comprising a step of drying the aggregate followed by a step of coating the aggregate with a hydrocarbon binder in a mixer. In the method of the invention, the 5 hydrocarbon binder comprises bitumen or a synthetic binder and the additive system of the invention. Said additive system may be added to the bitumen or to the synthetic binder by any known method for introducing additive. The additive system is preferably mixed with the hydrocarbon binder before being introduced into the mixer. The preparation temperature of a bitumen asphalt mix comprising a 35/50 grade D bitumen when used in the method of the invention ranges from 110'C to 140*C, preferably ranges from 1100C to 1300C. The preparation temperature of a bitumen asphalt mix comprising bitumen of penetration less than 35 (1/10 of a millimeter (mm)) in the method of the invention ranges from 1300C to 150*C, preferably ranges from 135CC to 1450C. This represents a lowering of 30*C to 500C compared with the usual 5 temperatures. The invention also provides the use of the additive system for lowering the preparation temperature and the application temperature of bitumen mixtures comprising aggregate and bitumen. The bitumen of the present invention is a mixture of hydrocarbons of natural D origin derived from the heavy fraction obtained when distilling crude oil, or coming from natural deposits in solid or liquid form, of specific gravity ranging from 0.8 to 1.2. The bitumens of the invention may be prepared by any conventional technique. In the meaning of the invention, the term "bitumens" also covers binders of plant origin such as V6g6col@ sold by the supplier Colas and described in patent application 5 FR 2 853 647, synthesized binders obtained from crude oil such as the Bituclair@ range of binders sold by the supplier Colas, bitumens that have been modified by incorporating additives of any kind, or indeed bitumens that have been improved by adding various types of polymer, such as copolymers of ethylene and vinyl acetate, or statistical copolymers or block copolymers of styrene and conjugate dienes such as 7 SBS block copolymers. This list is naturally not limiting. It is also possible to use mixtures of different types of bitumen. The bitumen of the present invention is preferably a bitumen of grade ranging from 10/20 to 35/50. The term "aggregate" refers to the materials described in the standard 5 XP P 18-545. Aggregates, in the meaning of XP P 98-135 may also be used in combination with the binder of the invention. To characterize asphalt mixes, use is made in particular of a description of their granular formula, i.e. the distribution by weight of the aggregate forming part of the composition of the asphalt mix as a function of granular class. The aggregates are of a mineral nature. o The characteristics and characteristics of the present invention appear better from the following examples given by way of non-limiting illustration. EXAMPLE 5 1. Preparation and characterization of the system of additive Additive system No. 1 was prepared, corresponding to a 50:50 mixture by weight of the following two components: A) reaction products of tetraethylenepentaamine with fatty carboxylic acids such 0 as fatty acids derived from tall oil or rapeseed oil, the molar ratio of tetraethylenepentaamine relative to the fatty carboxylic acids being 1:1; and B) a mixture of ethoxylated fatty diamines derived from tallow and comprising a majority of propylene diamine tall oil, a substance sold under the name Imbentin DT/1 50 by the supplier KoIB and for which the sum (x+y+z) of the ethoxy group is 15. 5 Additive system No. 1 comprises the following characteristics: - liquid down to -5*C; - viscosity at 20*C: 350 millipascal seconds (mPa.s); - flash point: higher than 200*C; and - miscible in bitumen at a concentration of 0.1% to 2% by weight relative to the total 0 weight of bitumen. II. Preparation the hydrocarbon binder ii.1 Hydrocarbon binder based on a 10/20 bitumen 5 Table I below presents a comparison between the characteristics of two hydrocarbon binders, one being a pure bitumen of the 10/20 class (reference binder), the other being a pure bitumen of the 10/20 class comprising 0.4% by weight of additive No. 1 relative to the total weight of the bitumen binder (bitumen No. 1).

8 Table I - Characteristics of the binder Test Reference binder Binder No. 1 Penetration at 250C NF N 1426 16 17 (1/10 mm) BRT (in 0C) EN 1427 65.4 65.6 G* (15*C, 10 Hz), fresh binder (in 63.1 58.1 MPa) EN 14770 G* (15*C, 10 Hz), RTFOT aged 74.5 73.3 binder (in MPa) Whether or not it includes the additive system No. 1, a bitumen binder has 5 practically the same penetration characteristics, ball and ring temperature (BRT), and complex modulus G* at 15*C and 10 hertz (Hz). It is of interest to observe that the pure bitumen of 10/20 class conserves a high modulus regardless of whether or not it includes the additive system No. 1, thereby enabling it to be used in a high-modulus asphalt mix. 11.2 Hydrocarbon binder based on a 35/50 bitumen A hydrocarbon binder (L2) comprising the additive system No. 1 was prepared with pure bitumen of 35/50 class. The added quantities of additive system were 0.4% by weight relative to the weight of bitumen. Ill. Asphalt mix preparation A 0/10 semi-coarse asphalt concrete (SCAC) type mix was made by incorporating "la Noubleau" type aggregate in a bitumen binder corresponding either to a pure bitumen of 35/50 class (reference asphalt mix) or a pure bitumen of 35/50 class 3 comprising 0.4% by weight of additive system No. 1 relative to the total weight of the bitumen (asphalt mix No. 1). The mixing temperature for the asphalt mix of the invention (asphalt mix No. 1) comprising the hydrocarbon binder and the aggregate is 1200C (preparation temperature). The reference asphalt mix not comprising an additive system was prepared at 160*C.

9 Formulation of the asphalt mix - 6/10 Noubleau 37.9% - 2/6 Noubleau 26.5% - 0/2 Noubleau 28.4% 5 - limestone filler 1.9% - 35/50 bitumen 5.3% Table 11 below presents a comparison between the characteristics of asphalt mix No. 1 that was fabricated, laid and compacted at 120*C, and the characteristics of the corresponding reference asphalt mix that was fabricated, laid, and compacted at 160*C. 0 Table II - Characteristics of the asphalt mix Test Reference Asphalt mix NF P 98-130 asphalt mix No. 1 (1 20*C) specifications (160*C) (class 3) PCG test: NF EN12697-31 - % voids at 60 gyrations 6.8% 7.1% 5%<C60<10% Duriez test: NF P 98-251-1 - Ratio r/R 0.95 0.86 20.75 Rut test NF EN12697-22 - Mean voids % of plates 3.0% 6.0% 5%<V<8% - Rut depth in % after 30,000 3.1% 2.8% <5% cycles at 60"C It is of interest to observe that additive No. 1 is directly active in the asphalt mix since it can be fabricated at 120 0 C instead of the 1650C needed for the corresponding 5 reference asphalt mix, i.e. a temperature reduction of 45"C during the preparation process. The effectiveness of additive No. 1 is clearly demonstrated since, unlike the reference asphalt mix, asphalt mix No. 1 satisfies the specifications of Standard NF P 98-130 (class 3 asphalt mix) for a class 2 asphalt mix study. The characteristics 0 of asphalt mix No. 1, comprising additive No. 1, are thus better than those of the reference asphalt mix.

Claims (10)

1. An additive system for preparing warm asphalt mix for road use, the system comprising: - one or more components (A) selected from the group of the group of adhesion dopes which are selected from the group of alkylamidopolyamines, alkylimidazolines, and alkylimidazopolyamines, which are the products of reaction between a polyamide (C) and a fatty carboxylic acid; fatty chain alkylpolyamines; the products of reaction between a polyamine (C) and the products of reaction of a fatty carboxylic acid or a vegetable oil with diethanolamine; said polyamine (C) is preferably a polyaklylene-polyamine, for examples, dimethylaminopropylamine, N-aminoethylpiperazine, diethylenetriamine, triethylenetetraamine, or tetraethylenepentaamine; and - one or more components (B) selected from the group of ethoxylated fatty (poly)amines and ethoxylated fatty amido(poly) amines satisfying following formula 1 or 2: R-N1-H2- (CH 2 CH 2 O0)-H HdOCH 2 CH2 (CH2CH2OH Formula 1 R'-CO-NYCH2 )-N-ECH 2 CH 2 OkH V 'I WO H (CH 2 CH 2 O).H Formula 2 wherein: - R and R' represent a C8 to C24 hydrocarbon radical, preferably an alkyl, a C8 to C22 alkenyl, or a mixture thereof; - v and v' are integers greater than or equal to 1, preferably ranging from 1 to 6, and more preferably v and v are equal to 3; - w is an integer greater than or equal to 0, preferably ranging from 0 to 5, more preferably ranging from 0 to 3; - w' is an integer greater than or equal to 1, preferably ranging from 1 to 5, better still ranging from 1 to 3; - x, y, and z are integers selected so that the sum (x+y+z) is greater than 3, preferably ranging from 3 to 20, and better equal to 15; and 11 - y' and z' are integers selected such that the sum (y'+z') ranges from 1 to 1000, is preferably greater than 3, preferably ranges from 3 to 20, and better still is equal to 15.

2. An additive system according to claim 1 or claim 2, characterized in that said ethoxylated fatty (poly)amines are selected from the group of ethoxylated fatty monoamines, diamines, triamines, and tetraamines, preferably from ethoxylated fatty diamines satisfying the following formula B1: R-N4H2-N-(CH 2 CH 2 O4H HjOCH 2 CH2 (CH 2 CH 2 0)-H where R represents a linear or branched, saturated or unsaturated hydrocarbon chain and x, y, and z are integers selected such that the sum (x+y+z) is greater than 3, preferably ranging from 3 to 20.

3. An additive system according to claim 2, wherein in formula 61, the sum (x+y+z) is equal to 15.

4. An additive system according to claim 1 or claim 2, characterized in that said ethoxylated fatty amido(poly)amines are selected from the group of ethoxylated fatty amidomonoamines, amidodiamines, and amidotriamines, preferably from ethoxylated fatty amidomonoamines satisfying the following formula B2: R'-CO-NCH2 N-(CH 2 CH 2 Og)YH H (CH 2 CH 2 O)-H where R' represents a linear or branched, saturated or unsaturated hydrocarbon chain, and y' and z' are integers selected such that the sum (y'+z') ranges from 1 to 1000, is preferably greater than 3, preferably ranges from 3 to 20.

5. An additive system according to claim 4, wherein in formula B2, the sum (y'+z') is equal to 15. 12

6. An additive system according to any one of claims 2 to 4, characterized in that the R or R' groups are derived from natural fats and oils such as tallow, rapeseed oil, soya oil, tall oil, and preferably R or R' represents a tallow alkyl.

7. An additive system according to any one of the preceding claims, characterized in that it comprises by weight relative to the total weight of the additive system, 10% to 70%, preferably 10% to 50% by weight of the component(s) A and 30% to 90%, preferably 50% to 90% by weight of the component(s) B.

8. A hydrocarbon binder comprising an additive system according to any one of claims 1 to 7, said hydrocarbon binder preferably being pure bitumen.

9. A hydrocarbon binder according to claim 8, characterized in that the additive system represents 0.1% to 2% by weight, preferably 0.3% to 0.6% by weight, relative to the total weight of the hydrocarbon binder.

10. A warm asphalt mix for road use comprising a hydrocarbon binder according to claim 8 or claim 9 together with an aggregate. COLAS WATERMARK PATENT & TRADE MARK ATTORNEYS P34867AU00