Abstract: The present disclosure relates to the field of so-called “spreading” emulsions of hydrocarbon binder, in particular cationic emulsions of hydrocarbon binders. Such emulsions are useful in the preparation of surface dressings, tack coats, fog seal type surface courses and paver seams. The use of an anionic polymer to improve immediate adhesiveness of a cationic emulsion of hydrocarbon binder to solid particles is particularly described.

Abstract: A process for preparing a cationic latex modified hydrocarbon binder emulsion comprising the steps of: (a) preparing a cationic copolymer latex emulsion by an emulsion polymerisation of polymerizable monomers, said polymerizable monomers comprising A—one or more non-ionic acrylate ester and/or methacrylate ester monomer(s), and B—optionally styrene monomer and/or one or more non-ionic styrene derivative monomer(s), C—optionally one or more cross-linking monomer(s) having two or more ethylenically unsaturated (C?C) double bonds susceptible to free radical copolymerisation, D—optionally one or more epoxy functional monomer(s) having one C?C double bond susceptible to free radical copolymerisation and one epoxide functional group, wherein said polymerizable monomers do not comprise any aliphatic conjugated diene monomer, in presence of a cationic stabilizing surfactant, and (b) adding the cationic copolymer latex emulsion resulting from step (a) to a cationic hydrocarbon binder emulsion, or (b?) adding the catio

Abstract: The present patent application concerns the use of at least one compound of formula (I): R1—O—C(O)—R2??(i) in which: R1 is a linear or branched C1-C6 alkyl group, and R2 is a linear or branched hydrocarbon chain comprising from 2 to 13 carbon atoms and one or more unsaturations, the said unsaturation(s) being one or more carbon-carbon double bonds, as a fluxing agent for hydrocarbon binders.

Abstract: The invention relates to a device forming a foil air bearing, comprising a cylindrical sleeve (10) extending along a longitudinal direction, and having an inner surface (11) which defines a central bore, characterized in that it further comprises: at least one longitudinal notch (40, 50, 60) formed in said cylindrical sleeve and opening radially into said central bore; a first peripheral inner lining, called the bump lining, comprising at least one metal foil equipped with radial projections, called the bump foil (22, 23, 24), each bump foil having, at each end, a radial tongue, called the radial bump tongue (22a, 22b, 23a, 23b, 24a, 24b), housed freely in a longitudinal notch (40, 50, 60); a second peripheral inner lining, called the top lining, comprising at least one metal foil, called the top foil (32, 33, 34), each top foil having, at each end, a radial tongue, called the radial top tongue (32a, 32b, 33a, 33b, 34a, 34b), housed freely in a longitudinal notch (40, 50, 60).

Abstract: The invention relates to a device forming a foil air bearing, comprising a cylindrical sleeve (10) extending along a longitudinal direction, and having an inner surface (11) which defines a central bore, characterized in that it further comprises: at least one longitudinal notch (40, 50, 60) formed in said cylindrical sleeve and opening radially into said central bore; a first peripheral inner lining, called the bump lining, comprising at least one metal foil equipped with radial projections, called the bump foil (22, 23, 24), each bump foil having, at each end, a radial tongue, called the radial bump tongue (22a, 22b, 23a, 23b, 24a, 24b), housed freely in a longitudinal notch (40, 50, 60); a second peripheral inner lining, called the top lining, comprising at least one metal foil, called the top foil (32, 33, 34), each top foil having, at each end, a radial tongue, called the radial top tongue (32a, 32b, 33a, 33b, 34a, 34b), housed freely in a longitudinal notch (40, 50, 60).

Abstract: The invention relates to the manufacture of a bituminous product type mix or surface dressing which includes bringing into contact, at a temperature below 110° C., mineral particles with an emulsion (i) derived from emulsification of a hydrocarbon binder in an aqueous phase at a mixing temperature above the contacting temperature, and (ii) which includes an additive which: forms a homogeneous mixture with the hydrocarbon binder at the mixing temperature; is not compatible with the hydrocarbon binder at the contacting temperature; is used at a content above its solubility in the aqueous medium of the emulsion at the contacting temperature.

Abstract: The invention relates to the use, as fluxing agent for the production of a hot surface dressing, of an additive for hydrocarbon binder including at least one compound having the formula CH3—X—R—Y—R2 where: R2 is a C1-C11 chain of alkyl type, advantageously methyl; —X— and —Y— are each an ester or amide group with R??H or C1-C4 alkyl; and —R— is a C1-C10 divalent hydrocarbon chain, optionally interrupted by one or more oxygen atoms; and where the STV pseudo-viscosity measured for said hydrocarbon binder to which has been added 10% by weight of said additive is below 500 seconds.

Abstract: The invention concerns the use of an aqueous suspension of solid particles of a calcium/magnesium compound of formula (A): nCa(OH)2.mCaCO3.aMgO.bMg(OH)2.cMgCO3.I as an agent regulating the breaking of a bitumen emulsion. The invention also concerns a bituminous road material obtained by mixing a solid mineral fraction with a cationic bitumen emulsion of the type binder in water, characterised in that it involves adding, to the mineral fraction, an aqueous suspension of solid particles of a calcium/magnesium compound of formula (A). The invention also concerns a method for preparing a material according to the invention and the use of same for producing surface courses, tack coats or temporary surface courses. The invention finally concerns a method for obtaining a tack coat by spreading a cationic bitumen emulsion, comprising a step of applying an aqueous suspension of solid particles of a calcium/magnesium compound of formula (A).

Abstract: The invention relates to the use, as fluxing agent for bitumen compositions, of at least one compound having the formula (I) R1—C(O)O—R2 ??(I) where: each of R1 and R2, which may be identical or different, is a linear or branched hydrocarbon chain which does not carry an unsaturated covalent bond, optionally interrupted by one or more oxygen atoms, and optionally carrying one or more hydroxyl functions.

Abstract: The invention concerns the use as a fluxant agent of at least one compound with the formula (I) R1—X—R—Y—R2??(I) where: R1 and R2, which can be identical or different, are hydrocarbon chains, linear or branched, at C2-C11; each of —X— and —Y—, which can be identical or different, is an —O—(C?O)— group; —(C?O)—O—; —NR?—(C?O)—, where R? represents a hydrocarbon atom or an alkyl radical at C1-C4, or —(C?O)—NR?—, where R? represents a hydrocarbon atom or an alkyl radical at C1-C4, the —R— group is a divalent hydrocarbon chain, at C1-C10, linear or branched, and possibly interrupted by one or more oxygen atom(s) in a composition including a hydrocarbon binder for the preparation of the bituminous product based on solid mineral particles in contact with the said hydrocarbon binder, where the said compound of formula (I) is present in the said composition when the said composition is brought into contact with the said solid mineral particles.

Abstract: The invention concerns the use of an aqueous suspension of solid particles of a calcium/magnesium compound of formula (A): nCa(OH)2.mCaCO3.aMgO.bMg(OH)2.cMgCO3.I as an agent regulating the breaking of a bitumen emulsion. The invention also concerns a bituminous road material obtained by mixing a solid mineral fraction with a cationic bitumen emulsion of the type binder in water, characterised in that it involves adding, to the mineral fraction, an aqueous suspension of solid particles of a calcium/magnesium compound of formula (A). The invention also concerns a method for preparing a material according to the invention and the use of same for producing surface courses, tack coats or temporary surface courses. The invention finally concerns a method for obtaining a tack coat by spreading a cationic bitumen emulsion, comprising a step of applying an aqueous suspension of solid particles of a calcium/magnesium compound of formula (A).

Abstract: The present invention relates to a process for producing cold bituminous mixes, comprising the following successive steps: a. in a mixer, coating, at ambient temperature, all of the solid mineral fractions with all of the binder in emulsion, and optionally a portion of fluxing agent, over a time interval T sufficient to observe a coating of the mix; then b. at the end of the time interval T, adding the remaining amount of fluxing agent, over a time interval t, such that the T/t ratio is greater than 2, the other mixing conditions of steps a) and b) being otherwise substantially identical. The present invention also relates to cold bituminous mixes, capable of being obtained by the process according to the invention and the use thereof for the production of wearing courses, the production of emulsion-stabilized gravels or the production of storage-grade mixes.

Abstract: The invention relates to a synthetic binder characterized in that said binder includes: from 20 wt % to 100 wt % of at least one polyester based essentially on material from renewable resources, in particular of vegetable origin, having: a hydroxyl number below 100 mg KOH/g, an acid number below 25 mg KOH/g, an iodine number below 100 g I2/100 g, and from 0 wt % to 80 wt % of at least one natural or modified resin from renewable resources, in particular of vegetable origin.

Abstract: The present invention relates to a process for producing cold bituminous mixes, comprising the following successive steps: a. in a mixer, coating, at ambient temperature, all of the solid mineral fractions with all of the binder in emulsion, and optionally a portion of fluxing agent, over a time interval T sufficient to observe a coating of the mix; then b. at the end of the time interval T, adding the remaining amount of fluxing agent, over a time interval t, such that the T/t ratio is greater than 2, the other mixing conditions of steps a) and b) being otherwise substantially identical. The present invention also relates to cold bituminous mixes, capable of being obtained by the process according to the invention and the use thereof for the production of wearing courses, the production of emulsion-stabilized gravels or the production of storage-grade mixes.

Abstract: The invention relates to a synthetic binder characterized in that said binder includes: from 20 wt % to 100 wt % of at least one polyester based essentially on material from renewable resources, in particular of vegetable origin, having: a hydroxyl number below 100 mg KOH/g, an acid number below 25 mg KOH/g, an iodine number below 100 g I2/100 g, and from 0 wt % to 80 wt % of at least one natural or modified resin from renewable resources, in particular of vegetable origin.

Abstract: Described is the use, for preparing or treating bituminous compositions, of at least one compound selected among: esters of glycolic, lactic and gluconic acids, methylic, ethylic and isobutylic esters of glutaric, succinic and adipic acids, and ethers or esters of a product resulting from internal dehydration of a sugar, preferably a hydrogenated sugar. Also described is a method for preparing or treating such compositions and the resulting compositions.

Abstract: The present invention relates to the use of an exothermic mixture of at least i) an acidic anhydride or an acid salt and of at least ii) a basic anhydride or a basic salt, in a cold, warm or semi-warm bituminous mix based on a bituminous binder containing water in order to increase the temperature of the bituminous mix. It also relates to a process for manufacturing a bituminous mix using the exothermic mixture, to the bituminous mix capable of being obtained by this process and to the use thereof for the manufacture of a road surface. It additionally relates to the use of the exothermic mixture in order to dry the aggregates and to the aggregates containing this mixture. Finally, it relates to the use of the exothermic mixture in a bitumen emulsion.

Abstract: The invention relates to a method for manufacturing a bituminous coated material comprising mineral solid fractions coated with a binder, wherein the method comprises a step of heating a portion of said mineral solid fractions and adding separately but simultaneously the binder and the remaining portion of said mineral solid fractions. Application to road construction.

Abstract: The present invention relates to a hot-melt binder based on asphalt or bitumen, comprising at least one additive for lowering the production temperature of the asphalt product relative to that of the base product, said additive being a triglyceride of saturated fatty acids. The present invention likewise relates to processes for preparing an asphalt or bituminous product coated material, in which the mixing temperature is lowered. The present invention finally relates to an asphalt product or coated bituminous material comprising a hot-melt binder according to the invention.

Abstract: Described is the use, for preparing or treating bituminous compositions, of at least one compound selected among: esters of glycolic, lactic and gluconic acids, methylic, ethylic and isobutylic esters of glutaric, succinic and adipic acids, and ethers or esters of a product resulting from internal dehydration of a sugar, preferably a hydrogenated sugar. Also described is a method for preparing or treating such compositions and the resulting compositions.