Bituminous composition comprising aluminum-based plastic waste, processes and uses

Abstract

Bituminous composition comprising aluminum-based plastic waste, methods and uses The present invention relates to a bituminous composition obtained by incorporating, into a bitumen base, plastic waste particles, characterized in that the plastic waste particles comprise a polymeric part and aluminum and in that the aluminum represents from 5 to 40% by mass, preferably from 10 to 25% by mass, and preferentially from 15 to 20% by mass, of the mass of the incorporated plastic waste. The present invention also relates to a bituminous composition comprising plastic waste, characterized in that said plastic waste comprises a polymeric part and aluminum, the aluminum representing from 0.05 to 3% by mass, preferably from 0.1 to 1.5% by mass, and preferentially from 0.2 to 1% by mass, of the mass of the bituminous composition.The invention also relates to the processes for preparing such compositions and their uses, in particular in the road sector. Figure for the abstract: none.

Description

Title of the invention: Bituminous composition comprising aluminum-based plastic waste, methods and uses Technical field

[0001] The present invention aims to propose new bituminous compositions offering a new way of recycling plastic waste. In the context of the invention, it is proposed to substitute part of the bitumen base used in the bituminous compositions, with particular plastic waste, comprising aluminum.

[0002] The invention provides alternative bituminous compositions to those of the prior art, used in different applications, and in particular in the road sector. The bituminous compositions and methods for manufacturing such compositions proposed within the framework of the invention provide new possibilities for recycling plastic waste, and are therefore particularly advantageous, from an ecological point of view and for reducing the carbon footprint. The bituminous compositions according to the invention also have an attractive cost price, due to the use of recycled plastic waste.

[0003] The high temperature stability of bituminous compositions including plastic waste is the main challenge, due to the low compatibility of such waste with bitumen, and in particular of such waste including polyolefins constituting the majority of plastic waste to be recycled, and their tendency to cream in the bitumen. The invention provides a solution to this problem, by using particular plastic waste based on aluminum. Statement of the invention

[0004] The invention relates to a bituminous composition obtained by incorporating, into a bitumen base, plastic waste particles, characterized in that the plastic waste particles comprise a polymeric part and aluminum and in that the aluminum represents from 5 to 40% by mass, preferably from 10 to 25% by mass, and preferentially from 15 to 20% by mass, of the mass of the incorporated plastic waste particles. In particular, the aluminum represents from 0.05 to 3% by mass, preferably from 0.1 to 1.5% by mass, and preferentially from 0.2 to 1% by mass, of the mass of the bituminous composition.

[0005] The invention also relates to a bituminous composition comprising plastic waste, characterized in that said plastic waste comprises a polymeric part and aluminum, the aluminum representing from 0.05 to 3% by mass, preferably from 0.1 to 1.5% by mass, and preferentially from 0.2 to 1% mass, of the mass of the bituminous composition. In particular, aluminum represents from 5 to 40% by mass, preferably from 10 to 25% by mass, and preferentially from 15 to 20% by mass, of the mass of plastic waste present in the bituminous composition.

[0006] In the context of the invention, it has been found that the introduction of recycled aluminum-based plastic waste leads to bituminous compositions that are stable when stored at high temperatures, and in particular stable when stored at 180°C for 3 days. Storage at 180°C for 3 days corresponds to the evaluation conditions in standard NF-EN 13399.

[0007] The compositions according to the invention can therefore be described as stable on storage at 180°C for 3 days, in particular under the evaluation conditions in the NF-EN 13399 standard. Advantageously, the bituminous compositions according to the invention, whatever the implementation variant, have, after storage at 180°C for 3 days, a difference in ring-ball temperatures measured according to the NF-EN 13399 standard, less than or equal to 5°C and have, after storage at 180°C for 3 days, a difference in needle penetrability at 25°C, measured according to the NF-EN 13399 standard, less than or equal to 26 1 / 10 mm.In particular, the bituminous compositions according to the invention, whatever the implementation variant, have, after storage at 180°C for 3 days, a difference in ring-ball temperatures measured according to standard NF-EN 13399, less than or equal to 5°C and have, after storage at 180°C for 3 days, a difference in needle penetrability at 25°C, measured according to standard NF-EN 13399, less than or equal to 9 1 / 10 mm. Also, the bituminous compositions according to the invention correspond to a class 2, according to standard EN 14023.

[0008] According to standard NF-EN 13399, a sample of the bituminous composition whose stability is to be evaluated is kept in a vertical container at a temperature of 180°C for three days. After cooling the sample, this sample is divided into three equal parts. The two extreme portions (also called parts) (upper and lower) are then analyzed to evaluate any differences in their characteristics. The difference considered in ring-ball temperatures or needle penetrabilities at 25°C is the difference observed between the value obtained for the upper part (denoted Pene H or TBA H in the examples) and the lower part (denoted Pene B or TBA B in the examples), after storage at 180°C for 3 days.In particular, preferably, bituminous compositions of class 2 in ring-ball temperature difference (less than or equal to 5°C) and also a class 2 in penetrability difference (less than or equal to 9 1 / 10 mm) are targeted. It can also be noted that in the case of compositions which are really unstable, a larger quantity of polymer is clearly visually seen. in the upper portion of the sample, so that it is not necessary to measure Pene H, Pene B, TBA H and TBA B.

[0009] Advantageously, the mass of plastic waste present in a bituminous composition according to the invention represents from 0.5 to 10% by mass, preferably from 0.7 to 8% by mass, and preferentially from 0.9 to 6% by mass, of the mass of the bituminous composition.

[0010] This mass is equivalent to the mass of plastic waste particles which is incorporated or added into the bituminous composition, and which is therefore necessary for its preparation.

[0011] In general, the polymeric part of the plastic waste represents from 0.2 to 8% by mass, preferably from 0.5 to 7% by mass, and preferentially from 0.7 to 5% by mass, of the bituminous composition.

[0012] Most often, the polymeric part represents from 40% to 95% by mass, preferably from 70 to 90% by mass, and in particular from 75 to 90% by mass, and preferably from 75 to 85% by mass, and in particular from 80 to 85% by mass, of the mass of the plastic waste.

[0013] Preferably, in the bituminous compositions according to the invention, the plastic waste is divided into domains with an average size of less than 14 μm, in particular into domains with an average size of less than 10 μm and, preferably, into domains with an average size in the range from 0.1 to 8 μm. Advantageously, in the bituminous compositions according to the invention, the plastic waste is divided into domains whose D90 is less than 20 μm, in particular less than 18 μm, and preferably belonging to the range from 2 to 15 μm. In a particularly preferred manner, in the bituminous compositions according to the invention, the plastic waste is divided into domains with an average size in the range from 0.1 to 8 μm and having a D90 in the range from 2 to 15 μm.The average size and the D90 of the domains can, in particular, be determined using an optical microscope by fluorescence reflection under UV excitation, in particular at a wavelength of 470 nm. Preferably, the analyzed image will comprise at least 50 domains, advantageously at least 100 domains, so as to be representative of the bituminous composition analyzed. By average size is meant the arithmetic mean of the sizes measured on an image obtained by optical microscopy, in particular with an optical microscope by fluorescence reflection under UV excitation, in particular at a wavelength of 470 nm. The size of a domain corresponds to the largest measurable size for the domain considered, on the image obtained by optical microscopy, in particular with an optical microscope by fluorescence reflection under UV excitation, in particular at a wavelength of 470 nm. The D90 is defined as being the size of the . domains for which 90% of the domains have a size less than or equal to this value. For example, a microscope and a method as described in the examples may be used to obtain the image which is analyzed, for calculating the average size and the D90 of the domains formed by the plastic waste within the bituminous composition.

[0014] In the context of the invention, the plastic waste is, in particular, derived from food packaging(s), and in particular from food cartons.

[0015] According to particular embodiments of the bituminous compositions according to the invention, the polymeric part of the plastic waste comprises at least one thermoplastic polymer chosen from polyethylene, ethylene vinyl alcohol and polypropylene. These are the polymers most commonly used in food packaging, in association with aluminum foils.

[0016] Preferably, the polymeric part of the plastic waste does not comprise high density polyethylene (HDPE). In particular, the polymeric part comprises low density polyethylene (LDPE) and not high density polyethylene, nor a high density polyethylene / low density polyethylene blend, which is more favorable for obtaining optimal stability at high temperature.

[0017] In the bituminous compositions according to the invention, the bitumen base generally represents at least 60% by mass, preferably at least 70% by mass, or even at least 79% by mass, preferably from 90 to 99.5% by mass, in particular from 92% to 99.3% by mass, and in particular from 94 to 99.1% by mass, of the mass of the bituminous composition. In particular, the bitumen base represents from 90 to 99.5% by mass, in particular from 92% to 99.3% by mass, and preferably from 94 to 99.1% by mass, when the bituminous composition does not comprise any other polymeric component, or even no other additives, than the polymeric portion of the plastic waste.

[0018] It is also possible for a bituminous composition according to the invention to further comprise one or more additional polymers chosen from olefinic polymers and elastomers, in particular from olefinic polymers and crosslinked or crosslinkable elastomers, preferably representing from 0.05 to 10% by mass, preferentially from 0.1 to 8% by mass, and even more preferably from 0.3 to 6% by mass, of the mass of the bituminous composition.

[0019] According to particular embodiments of the bituminous compositions according to the invention, the plastic waste particles are, before incorporation into the bituminous composition, in the form of agglomerates derived from multi-layer waste, said multi-layer waste comprising at least one layer of aluminum associated with at least one layer of thermoplastic polymer.

[0020] The invention also relates to a process for preparing a bi-composition tuminose, in particular as described in the context of the invention, comprising the incorporation, in a bitumen base, under mixing and heating, of particles of plastic waste which comprise a polymeric part and aluminum and in which the aluminum represents from 5 to 40% by mass, preferably from 10 to 25% by mass, and preferentially from 15 to 20% by mass, of the mass of the plastic waste incorporated.

[0021] Advantageously, the mixing is carried out for a time and with suitable stirring, to obtain a homogeneous distribution and dispersion of the plastic waste within the bituminous composition obtained.

[0022] In general, the incorporation and mixing are carried out under heating at a temperature in the range of 90 to 230°C, preferably in the range of 120 to 200°C, and preferably in the range of 150 to 180°C.

[0023] According to particular embodiments, the incorporation of the plastic waste and the mixing are carried out, under heating at a temperature higher than the melting temperature of the polymeric part of the plastic waste. Such an implementation makes it possible to facilitate the distribution of the plastic waste in the bituminous composition.

[0024] In particular, the method according to the invention comprises a step of mixing the bituminous composition with stirring at a speed of 100 to 600 revolutions / minute, preferably 200 to 400 revolutions / minute and for a duration of 2 to 30 hours, preferably 6 to 24 hours. Such a mixing step makes it possible, in particular, to distribute the plastic waste in said composition. This step is called in the examples “homogenization step”.

[0025] The method according to the invention may further comprise a preliminary step of reducing the size of the plastic waste particles, after their incorporation into the bitumen base, with stirring at a speed of 2000 to 6000 rpm, preferably 4000 to 5000 rpm and for a duration of 5 to 60 minutes, preferably 15 to 30 minutes. This step is optional and is called in the examples "grinding step". It is carried out before the so-called homogenization step.

[0026] The bituminous compositions according to the invention find different applications. Also, the invention also has the following subject matter: - the use of a bituminous composition according to the invention, for preparing a waterproofing coating, a membrane or an impregnation layer; as well as the methods for preparing such a waterproofing coating, such a membrane or such an impregnation layer; - bituminous binders comprising a bituminous composition according to the invention; - the use of a bituminous composition according to the invention, as a bituminous binder in a bituminous coating comprising a bituminous composition according to the invention, aggregates, and possibly mineral and / or synthetic fillers; as well as the processes for preparing such a bituminous coating; - the use of a bituminous composition according to the invention, as a bituminous binder in an asphalt comprising a bituminous composition according to the invention, and mineral and / or synthetic fillers; as well as the processes for preparing such an asphalt; - as well as the use of a bituminous composition according to the invention, as a bituminous binder in a surface dressing, a hot mix, a cold mix, a cold-cast mix, an emulsion gravel or a wearing course, which comprises a bituminous composition according to the invention, aggregates and / or recycled millings; as well as the processes for preparing such a surface dressing, hot mix, cold mix, cold-cast mix, such an emulsion gravel or wearing course. Definitions and Methods

[0027] The quantities of the different components present in a bituminous composition according to the invention are given in % by mass, relative to the total mass of the composition (hereinafter referred to as % m / m), unless otherwise specified.

[0028] The standards mentioned in the context of the invention correspond to the version in force on the date of January 1, 2021, unless otherwise specified. Description of the embodiments Bitumen

[0029] The invention relates to bitumen compositions modified by the addition of at least one additive or adjuvant, also called bituminous compositions. These may comprise one or more bitumens. The bitumen(s) present in the bituminous compositions according to the invention are called "bitumen base" and constitute(s) a majority content of the composition, i.e. generally represent(s) at least 60% by mass of the total mass of the bituminous composition, and preferably at least 70%, or at least 79%, or at least 80%, or even at least 89%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, or even at least 99% by mass of the total mass of the bituminous composition.Among the bitumens that can be used according to the invention, mention may firstly be made of bitumens of natural origin, those contained in deposits of natural bitumen, natural asphalt or oil sands and bitumens originating from the refining of crude oil. In the context of the invention, the bitumen(s) used are advantageously chosen from bitumens originating from the refining of crude oil, in particular bitumens containing asphaltenes or pitches. The bitumens can be obtained by conventional manufacturing processes. bitumens in refineries, in particular by direct distillation and / or vacuum distillation of oil. These bitumens can optionally be visbroken and / or deasphalted and / or rectified in air. It is common to carry out vacuum distillation of atmospheric residues from the atmospheric distillation of crude oil. This manufacturing process therefore corresponds to the succession of atmospheric distillation and vacuum distillation, the feedstock feeding the vacuum distillation corresponding to the atmospheric residues. These vacuum residues from the vacuum distillation tower can also be used as bitumens. It is also common to inject air into a feedstock usually composed of distillates and heavy products from the vacuum distillation of atmospheric residues from the distillation of oil.This process makes it possible to obtain a blown, or semi-blown, or oxidized, or air-rectified, or partially air-rectified bitumen. Different bitumens obtained by the refining processes can be combined in the compositions according to the invention, to obtain the best compromise in terms of technical performance. In conventional processes for manufacturing bituminous compositions, the operation is carried out at manufacturing temperatures of between 90°C and 230°C, preferably between 120°C and 200°C, and with stirring for a period of at least 10 minutes, preferably between 30 minutes and 10 hours, more preferably between 1 hour and 6 hours. The term “manufacturing temperature” means the heating temperature of the bitumen(s) before mixing with the additives. The temperature and duration of heating vary according to the quantity of bitumen used and are defined by standard NF EN 12594.Blown bitumens can be manufactured in a blowing unit, by passing a stream of air and / or oxygen through a starting bitumen or bitumen mixture. This operation can be carried out in the presence of an oxidation catalyst, for example phosphoric acid. Generally, blowing is carried out at high temperatures, in the order of 200 to 300°C, for relatively long periods of time typically between 30 minutes and 2 hours, continuously or in batches. The blowing time and temperature are adjusted according to the properties targeted for the blown bitumen and according to the quality of the starting bitumen.

[0030] Among the bitumens that can be used according to the invention, mention may also be made of recycling bitumens.

[0031] The bitumens may be hard or soft grade bitumens, and in particular a bitumen of grade 35 / 50, 10 / 20, 20 / 30, 70 / 100 or 160 / 220, or a mixture of such bitumens.

[0032] The bitumen bases which can be used in the context of the invention preferably have a penetrability, measured at 25°C according to standard EN 1426, of 5 to 330 1 / 10 mm, preferably between 10 and 220 1 / 10 mm, more preferably from 10 to 120 1 / 10 mm. In a well-known manner, the so-called “needle penetrability” measurement is carried out using a standardized test NF EN 1426 at 25 °C (Pene). This penetrability characteristic is expressed in tenths of a millimeter (dmm or 1 / 10 mm). Needle penetrability, measured at 25 °C, according to the standardized test NF EN 1426, represents the measurement of penetration into a sample of bitumen, after a time of 5 seconds, of a needle whose weight with its support is 100 g. Used plastic waste particles

[0033] In the context of the invention, it is proposed to integrate aluminum-based plastic waste into bituminous compositions. With such aluminum-based plastic waste, good bitumen / plastic waste compatibility, and therefore good storage stability of the bituminous compositions obtained, have been observed.

[0034] Aluminum-based plastic waste is, in particular, derived from the recycling of food packaging, and, more specifically, from food cartons. Many food cartons, in particular for dairy products, sweet desserts, fatty semi-liquid foods or others, are made up of a multi-layer assembly of one or more sheets of paper, one or more plastic films, most often with at least one layer of polyolefin and in particular polyethylene, and one or more aluminum sheets. Multi-layer waste comprising at least one layer of aluminum associated with at least one layer of thermoplastic polymer, in particular chosen from polyethylene, ethylene vinyl alcohol and polypropylene, is particularly suitable for use in the manufacture of the bituminous compositions according to the invention.

[0035] Once collected, used food packaging, and in particular food cartons, are subjected to one or more treatments which generally result in plastic waste in the form of particles, which comprise a polymeric part and aluminum. In the context of the invention, this waste is referred to as plastic waste or recycled plastics, although such waste comprises a portion of aluminum. By waste, it is meant that it comes from a first use. The raw waste has been subjected to a treatment leading to the form of particles, which will be introduced into the bituminous compositions according to the invention. In general, aluminum represents from 5 to 40% by mass, preferably from 10 to 25% by mass, and preferentially from 15 to 20% by mass, of the mass of the plastic waste particles used in the context of the invention.

[0036] The polymeric part generally comprises, or even consists of, one or more thermoplastic polymers, especially chosen from polyethylene, ethylene vinyl alcohol and polypropylene. Most often, the polymeric part of the plastic waste particles used in the context of the invention represents from 40% to 95% by mass, preferably from 75 to 90% by mass, and preferably from 80 to 85% by mass of the mass of the plastic waste particles. Advantageously, the plastic waste particles comprise from 40% to 95% by mass, preferably from 75 to 90% by mass, and preferably from 80 to 85% by mass of one or more thermoplastic polymers, especially chosen from polyethylene, ethylene vinyl alcohol and polypropylene.

[0037] Preferably, the polymeric part of the plastic waste particles used in the context of the invention does not comprise high-density polyethylene. In particular, the polymeric part comprises low-density polyethylene and not high-density polyethylene, nor a high-density polyethylene / low-density polyethylene mixture, which is more favorable for obtaining optimal stability at high temperature of the bituminous compositions obtained.

[0038] The treatment of waste, and in particular food packaging, may include one or more operations of separation, grinding, agglomeration, extrusion, or other...

[0039] One of the treatments that is often implemented aims to separate the paper from the rest of the packaging, which therefore essentially comprises the polymeric part and the aluminum of the initial packaging.

[0040] Aluminum-based plastic waste that can be used in the context of the invention is, in particular, described in the publication “Recycling of post-consumer multilayer Tetra Pak® packaging with the Selective Dissolution-Precipitation process”, Resources, Conservation & Recycling 165, 2021, 105268 (9 pages).

[0041] In the context of the invention, the plastic waste, which will be introduced into the bituminous compositions according to the invention, is, before its introduction, in a fragmented form, which is called particles in the context of the invention. By particles, it is meant that the plastic waste is, before its introduction into the bituminous compositions according to the invention, in the form of discrete elements of small size, that is to say of a size less than 1 cm, preferably less than 7 mm, in particular in the range from 100 microns to 7 mm. In the context of the invention, the measured size corresponds to the largest size of a particle, given that the latter may be of irregular shape.

[0042] With a view to their revalorization, plastic waste may undergo one or more shaping operations, leading to the formation of aggregates or agglomerates which may be in the form of particles of irregular shape and size. They may also undergo an extrusion operation leading to particles of more regular shape and size, or possibly even of different compositions, if a compound is added during extrusion.

[0043] The plastic waste which will be introduced into the bituminous compositions according to the invention can therefore be found, before their introduction, in the form of extrudates, or, preferably, of aggregates or agglomerates, generically called particles within the scope of the invention.

[0044] The plastic waste particles that will be introduced into the bituminous compositions according to the invention comprise aluminum in sheet or leaf form. The aluminum is found, in the plastic waste particles, in the form of fragments of the initial layers of aluminum present in the packaging.

[0045] In the context of the invention, it has been demonstrated that the introduction of plastic waste particles comprising aluminum led to storage-stable bituminous compositions. The results presented in the examples also show that the substitution of a portion of the bitumen with such plastic waste particles was compatible with maintaining the usefulness of the composition as a bituminous composition. In particular, the major properties detailed in standard EN12591, in particular TB A and Penetrability, are retained after storage at high temperature.

[0046] Ultimately, in bituminous compositions, the plastic waste is distributed in said composition and loses the shape and particle size that it had before its introduction. The introduced plastic waste ultimately forms discrete domains in said composition. In particular, the distribution of plastic waste is homogeneous within the bituminous composition. Other possible polymeric additives

[0047] The bituminous compositions according to the invention may also include one or more additional polymers. In particular, an olefinic polymer and / or an elastomer, in particular a crosslinked or crosslinkable elastomer, may also be incorporated / present in the bituminous compositions according to the invention.

[0048] The bituminous compositions according to the invention may, in particular, comprise one or more olefinic polymers chosen in particular from: (a1) statistical or sequenced copolymers, preferably statistical, of ethylene and a monomer chosen from glycidyl acrylate and glycidyl methacrylate, comprising from 50% to 99.7% by mass, preferably from 60% to 95% by mass, more preferably 60% to 90% by mass of ethylene; (b1) statistical or sequenced terpolymers, preferably statistical, of ethylene, a monomer A chosen from vinyl acetate, C1-C6 alkyl acrylates and C1-C6 alkyl methacrylates and a monomer B chosen from glycidyl acrylate and glycidyl methacrylate; in particular said terpolymers comprising from 0.5% to 40% by mass, preferably from 5 to 35% by mass, more preferably from 10% to 30% by mass of units derived from monomer A and, from 0.5% to 15% by mass, preferably from 2.5% to 15% by mass of units derived from monomer B, the remainder being formed of units derived from ethylene; (cl) copolymers resulting from the grafting of a monomer B chosen from glycidyl acrylate and glycidyl methacrylate, onto a polymeric substrate; in particular the polymeric substrate is chosen from polyethylenes, in particular low-density polyethylenes, polypropylenes, random or block copolymers, preferably random, of ethylene and vinyl acetate and random or block copolymers, preferably random, of ethylene and C1 to C6 alkyl acrylate or C1 to C6 alkyl methacrylate, comprising from 40% to 99.7% by mass, preferably from 50% to 99% by mass of ethylene; preferably said grafted copolymers comprising from 0.5% to 15% by mass, preferably from 2.5% to 15% by mass of grafted units derived from monomer B.

[0049] The bituminous compositions according to the invention may, in particular, comprise one or more elastomers, in particular chosen from crosslinked or crosslinkable elastomers. The crosslinked elastomers will be introduced in their crosslinkable form into the compositions according to the invention and crosslinked in situ. Such elastomers known for incorporation into a bituminous composition are, in particular, SB copolymers (styrene and butadiene block copolymer), SBS (styrene-butadiene-styrene block copolymer), SIS (styrene-isoprene-styrene), SBS* (styrene-butadiene-styrene star block copolymer), SBR (styrene-b-butadiene-rubber), EPDM (modified ethylene propylene diene).

[0050] According to certain particular embodiments, a bituminous composition according to the invention comprises from 0.05% to 10% by mass, preferably from 0.1% to 8% by mass and preferentially from 0.3 to 6% by mass, relative to the total mass of said bituminous composition, of additional polymer(s), chosen from olefinic polymers and / or elastomers, in particular chosen from olefinic polymers and / or crosslinked or crosslinkable elastomers, and advantageously chosen from those precisely described in the present section. Compositions according to the invention

[0051] The preferred quantities of the different components present in the compositions according to the invention are given below. These quantities may be used independently of one another. Of course, they may be used in combination and all possible combinations of the ranges specified below are envisaged within the scope of the invention. By way of example, the widest mass % ranges given for each of the components may be used in combination, or the intermediate mass % ranges given for each of the components may be used in combination, or the most restricted mass % ranges given for each of the components may be used in combination.

[0052] Advantageously, the compositions according to the invention comprise, or even are consisting of: - a bitumen, - plastic waste, comprising a polymeric part and aluminium, which represents from 0.5 to 10% by mass, preferably from 0.7 to 8% by mass, and preferentially from 0.9 to 6% by mass, of the mass of the bituminous composition, with aluminium representing from 0.05 to 3% by mass, preferably from 0.1 to 1.5% by mass, and preferentially from 0.2 to 1% by mass, of the mass of the bituminous composition.

[0053] Advantageously, the compositions according to the invention comprise, or even consist of: - a bitumen, - plastic waste, comprising a polymeric part and aluminium, which represents from 0.5 to 10% by mass, preferably from 0.7 to 8% by mass, and preferentially from 0.9 to 6% by mass, of the mass of the bituminous composition, with aluminium representing from 0.05 to 3% by mass, preferably from 0.1 to 1.5% by mass, and preferentially from 0.2 to 1% by mass, of the mass of the bituminous composition, - from 0.05% to 10% by mass, preferably from 0.1% to 8% by mass and preferentially from 0.3 to 6% by mass, relative to the total mass of said bituminous composition, of one or more additional polymer(s), chosen from olefinic polymers and / or elastomers, in particular chosen from olefinic polymers and / or crosslinked or crosslinkable elastomers, and preferably from those specifically described in the present description.

[0054] In the compositions according to the invention, the polymeric part of the plastic waste advantageously represents from 0.2 to 8% by mass, preferably from 0.5 to 7% by mass, and preferentially from 0.7 to 5% by mass, of the bituminous composition.

[0055] Preferably, the polymeric portion of the plastic waste comprises at least one thermoplastic polymer selected from polyethylene, ethylene vinyl alcohol and polypropylene. Preferably, the polymeric portion of the plastic waste does not comprise high-density polyethylene. In particular, the polymeric portion comprises low-density polyethylene, and not high-density polyethylene, nor a high-density polyethylene / low-density polyethylene blend.

[0056] In the compositions according to the invention, the plastic waste forms discrete domains. In particular, in the bituminous compositions according to the invention, the plastic waste is distributed into domains with an average size of less than 14 μm, in particular into domains with an average size of less than 10 μm and, preferably, into domains with an average size in the range from 0.1 to 8 μm. Advantageously, in the bituminous compositions according to the invention, the waste plastics are divided into areas where the D90 is less than 20 pm, in particular less than 18 pm, and preferably belonging to the range from 2 to 15 pm.

[0057] Advantageously, the discrete domains are distributed homogeneously within the bituminous composition according to the invention.

[0058] The bituminous compositions according to the invention are stable when stored at high temperature, despite the presence of plastic waste. Advantageously, the bituminous compositions according to the invention, whatever the implementation variant, have, after storage at 180°C for 3 days, a difference in ring-ball temperatures measured according to standard NF-EN 13399, less than or equal to 5°C and have, after storage at 180°C for 3 days, a difference in needle penetrability at 25°C, measured according to standard NF-EN 13399, less than or equal to 26 1 / 10 mm, and preferably less than or equal to 9 1 / 10 mm.

[0059] Preparation of the bituminous compositions according to the invention and preparation process according to the invention

[0060] The bituminous compositions of the invention may be prepared by any method known to those skilled in the art. As a general rule, these methods comprise mixing the components and heating the resulting mixture. The bitumen may be heated before mixing. Usually, the bitumen is heated before mixing, and the additive(s) are added to the bitumen without having been previously heated. According to a particular embodiment of the invention, a bitumen composition is prepared by bringing into contact: - bitumen; - the desired mass of plastic waste particles; - optionally one or more other additive(s), in particular one or more additional polymers as described in this description.

[0061] In particular, the mixing of the following components is carried out, under heating and stirring: - a bitumen, - plastic waste particles comprising a polymeric part and aluminium, introduced in such a quantity that the plastic waste represents, preferably, from 0.5 to 10% by mass, preferably from 0.7 to 8% by mass, and preferentially from 0.9 to 6% by mass, of the mass of the final bituminous composition obtained, with the aluminium representing from 0.05 to 3% by mass, preferably from 0.1 to 1.5% by mass, and preferentially from 0.2 to 1% by mass, of the mass of the final bituminous composition obtained, - optionally, one or more additional polymers, chosen from olefinic polymers and / or elastomers, in particular chosen from olefinic polymers and / or crosslinkable elastomers, leading in the com final position to a crosslinked elastomer, and preferably chosen from those specifically described in the present description; said additional polymer(s) is / are introduced in such an amount as to represent, preferably, from 0.05% to 10% by mass, preferably from 0.1% to 8% by mass and preferentially from 0.3 to 6% by mass, of the mass of the final bituminous composition obtained.

[0062] The mixture of bitumen and plastic waste particles, or even of the other additive(s) present, can be carried out at a temperature ranging from 90 to 230°C, preferably ranging from 120 to 200°C, and preferentially ranging from 150 to 180°C.

[0063] Such a mixture is produced with stirring, so as to facilitate the dispersion and good distribution of the plastic waste particles introduced into the bitumen which will constitute the matrix of the composition, possibly in association with the additional polymer(s). The conditions are adapted to lead to obtaining a homogeneous mixture and to the distribution of the plastic waste. In particular, in the end, the plastic waste is in the form of small domains. Conventionally, the person skilled in the art will adjust the time and power of the stirring, as well as the mixing temperature, in particular as a function of the bitumen, or even of the additional polymer(s), to have a molten mixture, and of the size and quantity of the plastic waste particles.Advantageously, the mixing is carried out in such a way as to promote good distribution of the plastic waste, or even of the additional polymer(s), in the final bituminous composition obtained. In particular, the mixing conditions, and in particular the heating temperature, the time and the stirring power, are chosen so that ultimately in the bituminous composition obtained, the plastic waste is distributed into domains with an average size of less than 14 μm, in particular into domains with an average size of less than 10 μm and, preferably, into domains with an average size in the range from 0.1 to 8 μm. Advantageously, in the bituminous compositions according to the invention, the plastic waste is distributed into domains whose D90 is less than 20 μm, in particular less than 18 μm, and preferably belonging to the range from 2 to 15 μm.Thus, the mixing conditions are adapted to advantageously obtain bituminous compositions according to the invention, which, after storage at 180°C for 3 days, have a difference in ring-ball temperatures measured according to standard NF-EN 13399, less than or equal to 5°C and have, after storage at 180°C for 3 days, a difference in needle penetrability at 25°C, measured according to standard NF-EN 13399, less than or equal to 26 1 / 10 mm, and preferably less than or equal to 9 1 / 10 mm.

[0064] In general, and in a manner known to those skilled in the art, the bitumen or mixture of bitumens used for the manufacture of the composition is previously heated and stirred, before incorporation of the other constituents of the composition. The incorporation of the plastic waste is generally carried out while the bitumen is maintained at a temperature in the range of 90 to 230°C, preferably in the range of 120 to 200°C, and preferably in the range of 150 to 180°C.

[0065] The constituents may be introduced at the same time or in a sequential manner. Heating is maintained throughout the process, and the heating temperature may be modulated during the process. Agitation may be maintained or interrupted intermittently as needed, or modulated during the process.

[0066] According to particular embodiments, the incorporation of the plastic waste and the mixing are carried out, under heating at a temperature higher than the melting temperature of the polymeric part of the plastic waste. Such an implementation makes it possible to facilitate the distribution of the plastic waste in the bituminous composition.

[0067] In particular, the method according to the invention comprises a homogenization step which makes it possible, in particular, to distribute the plastic waste in said composition. Such a step is in particular a step of mixing the different constituents, with stirring at a speed of 100 to 600 revolutions / minute, preferably 200 to 400 revolutions / minute and for a duration of 2 to 30 hours, preferably 6 to 24 hours, while the mixture is heated to a temperature belonging to the range of 90 to 230°C, preferably to the range of 120 to 200°C, and preferably to the range of 150 to 180°C.

[0068] The method according to the invention may further comprise a step prior to this homogenization step, during which greater stirring is applied. In particular, mixing may be carried out, with stirring at a speed of 2000 to 6000 rpm, preferably 4000 to 5000 rpm and for a duration of 5 to 60 minutes, preferably 15 to 30 minutes. This step is optional and is intended to reduce, in particular when the plastic waste particles introduced are larger, the size of said plastic waste particles, after their incorporation into the bitumen base.

[0069] It is also possible to reduce the size of the plastic waste particles before their introduction into the bituminous composition, which is not preferred, for practical reasons.

[0070] In the method according to the invention, one or more bitumen(s), particles of one or more plastic waste(s), or even one or more additional polymer(s), corresponding to the descriptions given previously in the corresponding parts, are used. The crosslinked elastomers will be introduced in a crosslinkable form into the compositions according to the invention and crosslinked in situ.

[0071] Of course, in the method, the amounts used of bitumen, plastic waste particles, or even any additional polymer(s) that may be present, will be adjusted by the person skilled in the art to finally obtain the desired amounts in the final composition, and in particular those mentioned in the previous part regarding the compositions according to the invention.

[0072] The characteristics described in the preceding sections also apply to the preparation processes according to the invention. Thus, the components used in the preparation process will preferably be chosen from those previously described and introduced in proportions making it possible to achieve the quantities given for the description of the bituminous compositions according to the invention.

[0073] The bituminous compositions capable of being obtained by such processes also form an integral part of the invention.

[0074] Use and implementation of the bituminous compositions according to the invention

[0075] Various uses of the bituminous compositions obtained according to the invention are envisaged. In particular, the bituminous compositions according to the invention can be used as a bituminous binder. The bituminous binder or the bituminous composition according to the invention can in turn be used to prepare an association with aggregates, in particular road aggregates. With regard to road applications, the invention relates in particular to bituminous coatings as materials for the construction and maintenance of road bodies and their surfacing, as well as for carrying out all road works.

[0076] By bituminous coating is meant a mixture of a bituminous binder with aggregates and optionally mineral and / or synthetic fillers. The bituminous coating comprises a bituminous binder as described in the context of the invention, and optionally mineral and / or synthetic fillers, preferably chosen from fines, sand, gravel and recycled millings. The aggregates are mineral and / or synthetic aggregates, in particular recycled millings, with dimensions greater than 2 mm, preferably between 2 mm and 20 mm.

[0077] Also, the invention also relates to a process for preparing a bituminous coating comprising the hot mixing of a bituminous composition according to the invention, with aggregates, and optionally mineral and / or synthetic fillers.

[0078] The bituminous binder according to the invention can advantageously be used to prepare a surface coating, a hot mix, a cold mix, a cold-poured mix or an emulsion gravel. With regard to road applications, the invention also relates to asphalts as materials for manufacturing and covering pavements.

[0079] By asphalt is meant a mixture of bituminous binder with mineral and / or synthetic fillers. An asphalt comprises a bituminous composition as described in the context of the invention and mineral fillers such as fines, sand or gravel and / or synthetic fillers. The mineral fillers are consisting of fines (particles with dimensions less than 0.063 mm), sand (particles with dimensions between 0.063 mm and 2 mm) and possibly gravel (particles with dimensions greater than 2 mm, preferably between 2 mm and 4 mm). Asphalts have 100% compactness and are mainly used to manufacture and cover sidewalks, whereas coated materials have a compactness less than 100% and are used to manufacture roads. Unlike coated materials, asphalts are not compacted with a roller during their installation.

[0080] Also, the invention also relates to a process for preparing an asphalt comprising the hot mixing of a bituminous composition according to the invention, with mineral and / or synthetic fillers.

[0081] Another aspect of the invention relates to the use of a bitumen composition in various industrial applications, in particular for preparing a waterproofing coating, a membrane or an impregnation layer. As regards industrial applications of the bituminous compositions, mention may be made of the manufacture of waterproofing membranes, noise-reducing membranes, insulation membranes, surface coverings, carpet tiles, impregnation layers.

[0082] The characteristics described in connection with the bituminous composition and / or the process for preparing a composition according to the invention apply to the uses, products and processes described in this section. The examples below, with reference to the appended Figures, illustrate the invention, but are not limiting in nature. Brief description of the drawings

[0083] [Fig. 1] [Fig. 1] shows photographs highlighting the appearance and shape of plastic waste particles used in the examples. On the right, the graduations are in centimeters.

[0084] [Fig.2] [Fig.2] shows an image obtained by fluorescence reflection microscopy under UV of a bituminous composition according to the invention comprising 1% m / m of plastic waste, the scale shown at the bottom right corresponding to 200 pm.

[0085] [Fig.3] [Fig.3] shows an image obtained by UV fluorescence reflection microscopy of a bituminous composition outside the invention comprising 1% m / m of plastic waste, the scale shown at the bottom right corresponding to 200 pm.

[0086] [Fig.4] [Fig.4] shows an image obtained by fluorescence reflection microscopy under UV of a bituminous composition according to the invention comprising 3% m / m of plastic waste, the scale shown at the bottom right corresponding to 200 pm.

[0087] [Fig.5] [Fig.5] shows an image obtained by UV fluorescence reflection microscopy of a bituminous composition outside the invention comprising 3% m / m of plastic waste, the scale shown at the bottom right corresponding to 200 pm.

[0088] [Fig.6] [Fig.6] shows the evolution of elastic recovery (%), as a function of the stress (kPa) for a bituminous composition according to the invention and of a bituminous composition outside the invention.

[0089] [Fig.7] [Fig.7] shows the evolution of elastic recovery (%), as a function of stress (kPa) for different bituminous compositions including different mass % of aluminum-based plastic waste.

[0090] In [Fig.6] and [Fig.7], PE-Alu denotes the plastic waste used in the examples according to the invention. EXAMPLES Evaluation of compositions

[0091] The properties of bituminous compositions are measured using the following methods:

[0092] - Needle penetration at 25°C (Pene): unit = l / 10mm, standard EN 1426.

[0093] - Ring and ball softening temperature (RBT): unit = °C, standard EN1427.

[0094] - Stability: storage stability is assessed at 180°C for 3 days, by measuring the difference in penetrability and the difference in TB A according to standard EN 13399. The stability criteria concerning the variations in TBA and Pene tolerated are those given in standard EN 14023 relating to polymer modified bitumens. In cases of marked instability, the inhomogeneity is observed visually, the upper portion then containing polymer agglomerates visible to the naked eye.

[0095] - The compositions obtained were also observed by microscopy in fluorescence reflection under UV excitation, which made it possible to observe the distribution and average size of the domains formed by plastic waste within the bituminous composition.

[0096] For this purpose, an Olympus BX51 microscope was used in UV fluorescence reflection mode at a wavelength of 470 nm. The images were viewed and acquired using a high-resolution (12Mpixels) Olympus DP72 CCD (2 / 3 inch) color digital camera, cooled by the Peltier effect. A drop of bituminous composition was placed on a glass slide. This was covered with a coverslip. The structure was then observed using an xl0 magnification objective and the images were captured by the camera.Image processing was performed on the images obtained with the xlO lens and using ImageJ software according to the following steps: 1) Selection of the processing area, 2) Transformation of the JPEG image into an 8-bit image by coding each pixel in gray levels, 3) Subtraction of the background using a Rolling Bail type algorithm, 4) Application of a median filter to make the contours sharper, 5) Max Entropy type thresholding for . obtain a binary image.

[0097] From the binary image, the number of domains formed by the plastic waste within the bituminous composition, the size of each of them (the size corresponding to the largest dimension of a domain measured on the image) were determined, which makes it possible to calculate the average size (arithmetic mean of all the measured sizes), the D90 (the maximum size of 90% of the domains sorted in ascending order of size) and the Dmax (the size of the largest domain).

[0098] - Some compositions have also been characterized by other EN tests 12591, by a MSCRT type creep-recovery rheological test according to standard EN16659, before and after aging by RTFOT (from the English “Rolling Thin Film Oven Test” according to EN 12607-1).

[0099] The MSCRT test consists of a succession of creep-recovery tests at increasing stress levels carried out on a single sample at 60°C. 10 creep / recovery cycles were repeated at each stress threshold. During each cycle, the stress was applied for 1s, then the composition recovered for 9s. The stress levels oO applied in this order and without rest time were: 25, 50, 100, 200, 400, 800, 1600, 3200, 6400, 12800 and 25600 Pa. The objective of the test was to evaluate the resistance capacity of a composition with respect to permanent deformation. This permanent deformation is defined by the criteria of non-recoverable compliance Jnr and the percentage of elastic recovery er. Both criteria are calculated from experimental data: - The non-recoverable compliance Jnr in kPa 1 which measures the permanent deformation normalized by the stress. - The percentage of elastic recovery er in % which characterizes the percentage of deformation recovered in relation to the total deformation.

[0100] [Math.l] with :

[0101] ytot: Total deformation after the 1s of finishing, ytot = yr + yacc.

[0102] yr: Deformation recoverable after 9s of recovery.

[0103] yacc: Deformation not recoverable after 9s of recovery (or permanent or accumulated)

[0104] r: Stress applied during the creep-recovery cycle. Components

[0105] Two bitumen bases were used: - A grade 35 / 50 bitumen base with a Pene penetrability of 43 1 / 10 mm and a TB A of 52.2°C. - A bitumen base of grade 70 / 100 with a Pene penetrability of 83 1 / 10 mm and a TBA of 45.6°C.

[0106] The plastic waste incorporated into the bituminous compositions according to the invention based on aluminum (called PE-Alu) was in the form of particles from Tetra Pak® food bricks. The plastic waste particles were in the form of agglomerates of variable size. The size of the agglomerates was between 1 and 7 mm, approximately.

[0107] The aluminum content was determined by Thermogravimetric Analysis (TGA) under nitrogen (heating from 25°C to 1000°C at 20°C / min under N2 20ml / min).

[0108] The plastic waste, which was introduced into the bitumen base, was also analyzed by differential scanning calorimetry (DSC). The program used was as follows: 1) 25 to 250 °C, 10 K / min, N2 50 ml / min, first heating, 2) 250 °C, 10 min hold, N2 50 ml / min, 3) 250 at 25°C, -10 K / min, N2 50 ml / min, cooling, 4) 25°C, 10 min hold, N2 50 ml / min, 5) 25 to 250 °C, 10 K / min, N2 50 ml / min, second heating.

[0109] For ATG and DSC analyses, one to two particles of the plastic waste were placed in the measuring capsule.

[0110] The characteristics of the different plastic waste particles, before their introduction into the bitumen, are presented in Table 1. [YES] [Tables 1] Plastic waste Pre-treatment Agglomeration and fragmentation Aluminum content % (m / m) Average value obtained by TGA under Na 18.8 DSC A major peak around 110°C corresponding to LDPE Appearance Figure 1

[0112] Other plastic waste without aluminium, also in the form of particles, were also incorporated for comparison: particles of plastic waste from agglomerated polyethylene film (comparison 1), particles of recycled LDPE, grafted with maleic acid, which could have influenced the compatibility with bitumen (comparison 2). Preparation of bituminous compositions

[0113] The bituminous compositions were produced in a reactor, equipped with heating means and a Silverson® L5 mixer. The plastic waste was introduced into a bitumen base, while the latter was maintained at 180°C and stirred at 200 rpm.

[0114] After introduction, the bitumen / plastic waste mixture was subjected or not to a grinding operation under agitation of 5000 rpm for a variable duration, then to agitation at 200 or 300 rpm for a variable duration, corresponding to a homogenization step. Throughout the duration of the process, the mixture was maintained at 180°C. The conditions of the different protocols implemented are detailed in Table 2 below:

[0115] [T ables 2] Grinding stage at 5000 rpm Homogenization stage Time (minutes) Time (hours) Stirring speed Protocol 1 30 5 200 Protocol 2 45 24 300 Protocol 2bis 30 24 300 Protocol 3 30 24 200 Protocol 4 - 24 300 Protocol 5 60 24 200 Prepared bituminous compositions and evaluation 1) Compositions comprising 1% m / m of plastic waste

[0116] Table 3 shows the properties of the different bituminous compositions produced according to protocol 1.

[0117] [Tables3] Composition Invention Plastic waste ' PE-Alu Composition with Comparison 1 Composition with Comparison 2 Pene (1 / 10 mm) -NF EN 1426 34 34 33 TBA CO NF EN 1427 54.8 55.0 55.6 Storage stability 180°C for 3 days A / F EN 13399 Stable Not stable Not stable Pene H 36 35 33 Pene B 35 35 33 âPene 4 0 0 TBA H 54.4 > 90.0 - TBA B 54.6 54.4 âTBA 0.2 > 35.6 NA

[0118] NA: inhomogeneity observed visually.

[0119] It is clear from Table 3 that the incorporation of plastic waste not comprising aluminium (comparison 1 and 2) led to bituminous compositions which are not stable during storage. On the other hand, the bituminous compositions according to the invention are stable during storage. 2) Study of the influence of the preparation process

[0120] Table 4 shows the properties of different bituminous compositions, incorporating 1% m / m of plastic waste (one according to the invention and one outside the invention) produced according to protocol 3. It appears that the extension of the homogenization step (from 5 to 24 hours) did not improve in any way the stability of the composition outside the invention. The analysis of the images obtained by fluorescence reflection microscopy under UV excitation was carried out to determine the average size of the domains D, the maximum size Dmax and the D90 of the domains formed by the plastic waste in the bituminous compositions.

[0121] [Tables4] Composition invention Plastic waste PE-Aiu Composition with Comparative 2 Pene (1 / 10 mm) NF EN 1426 29 32 TBA (°C) NF EN 1427 58.8 56.8 UV microscopy Figure 2 Figure 3 Storage stability 180°C for 3 days NF EN 13399 Stable Not stable Pene H 30 29 Pene B 29 APene 1 0 TBA H 57.6 - TBA B 56.6 - ATBA 1.0 NA D (ym) 7.6 19.6 Dmax (ym) 22.4 83.0 D90 (ym) 12.6 28.9 Number of domains 203 155

[0122] NA: inhomogeneity observed visually.

[0123] The UV microscopy images also showed that the domains formed by the plastic waste in the bitumen are much smaller in the composition according to the invention where the plastic waste comprises aluminium, whereas in both cases the process included a step of prior grinding of the bitumen / plastic waste mixture.

[0124] Furthermore, it can be noted that the TBA is higher in the case of the composition according to the invention, compared to bitumen alone, which has a TBA of 52.2°C.

[0125] [Fig.6] shows the evolution of the elastic recovery er (%) of the two compositions, as a function of the stress (kPa). It appears that the performances in terms of elastic recovery are much better, with the bituminous composition according to the invention.

[0126] 3) Variation in the quantity of plastic waste incorporated

[0127] Different bituminous compositions were produced with the plastic waste, incorporating a % m / m of plastic waste varying from 1 to 5% m / m and varying the preparation protocol.

[0128] Table 5 presents the properties of different bituminous compositions, with precision of the protocol and the % m / m of plastic waste introduced.

[0129] [Tables5] Content 1% 1% 2% 3% 3% 3% 4% 5% 5% Protocol 3 1 2bis 4 3- 1 3 Pene (1 / 10 mm) NF EN 1426 34 29 36 23 26 28 27 26 25 TBA (°C) WP EN 1427 54.8 58.8 55.6 60.0 63.2 61.8 64.0 65.2 65.2 Storage stability 180eC for 3 days WF EN 13399 Stable cui / no yes yes yes yes yes yes yes no yes Pene H 36 30 37 32 34 28 26 39 29 Pene B 35 29 26 25 27 25 32 24 ÛPene 1 3 6 9 1 1 ■7 5 TBA M 54.4 57.6 55.4 61.2 65.2 62 0 65.8 78.8 66.0 TBA B 54.6 56.6 55.2 65.0 63.4 61.2 63.2 5S.0 65..8 ÛTBA 0.2 1.0 0.2 3.8 1.8 0.8 2.6 19.8 0.2

[0130] An image analysis by UV fluorescence microscopy was carried out to analyze the size of the domains formed by the plastic waste in the bituminous composition comprising 3% m / m of plastic waste, prepared according to protocol 2bis ([Fig.4]). The average size of the domains D was 4.2 pm, the maximum size Dmax of 12.6 pm, the number of domains of 385 and the D90 of 5.6 pm ([Fig.4]). For comparison, the incorporation of 3% of plastic waste corresponding to comparative 1 (without aluminum), prepared according to protocol 3, led to an unstable composition, with an average size of the domains D of 15.1 pm, a maximum size Dmax of 79.8 pm, the number of domains of 212 and a D90 of 36.4 pm ([Fig.5]).

[0131] It is clear from Table 5 that by adapting the manufacturing process, it is possible to obtain a bituminous composition which is stable during storage, i.e. which has variations in TB A and Pene according to the NF-EN 13399 standard which are low and comply with the criteria established by the NF-EN 14023 standard relating to polymer modified bitumens, namely that the difference in Pene measured according to the NF-EN 13399 standard is less than or equal to 9 (1 / 10 mm) and the difference in TBA measured according to the NF EN 13399 standard is less than or equal to 5°C. The 5% formulation of agglomerated PE-Alu is stable during storage, which is remarkable for a polyolefin in a bitumen.

[0132] From 3% in PE-Alu, it is noted that a process including a 24-hour homogenization step is preferable to obtain storage stability and allows to increase TB A in a more marked manner. This observation is particularly visible at a concentration of 5%.

[0133] Furthermore, it emerges from the results obtained by implementing different processes for the incorporation of plastic waste, with a content of 3% m / m, that a preparation process without a prior grinding step (protocol 4) made it possible to obtain bituminous compositions which are stable during storage.

[0134] [Fig.7] shows the evolution of the elastic recovery er (%) as a function of the stress (kPa), for the bituminous compositions according to the invention comprising 1% and 5% m / m of aluminum-based plastic waste produced according to protocol 3 and that comprising 3% m / m, produced according to protocol 2bis. It appears that the performances in terms of elastic recovery are much better than those of bitumen alone which has an elastic recovery er (%) of zero whatever the stress applied. It also appears from this figure that the elastic recovery is dependent on the mass % of plastic waste incorporated. 4) Use of another bitumen base

[0135] The plastic waste was introduced into the other 70 / 100 bitumen base, using protocol 1. As in the case of 35 / 50 bitumen, the plastic waste could be introduced at a level of 1 to 5% m / m, without loss of storage stability at 180°C, to lead to a stable bituminous composition, but this using, in all cases, protocol 1.

[0136] Table 6 shows the properties of the different bituminous compositions obtained.

[0137] [Tableauxô] invention Plastic waste 1% m / m Invention Plastic waste 3% m / m invention Plastic waste 5% m / m Pene <1 / 10 mm) NF EN 1426 63 60 55 TBA CCI NF EN «27 48.2 52.8 60.2 Storage stability 180*C for 3 days NFEN 13399 Pene H 66 62 58 Pene B 66 64 55 Pene 0 2 3 TBA H 46.8 53.0 59.2 TBA B 47.0 52.4 59.6 ATBA 0.2 0.6 0.4

Claims

Claims

1. Bituminous composition obtained by incorporating, into a bitumen base, plastic waste particles, which comprise a polymeric part and aluminium, characterized in that the aluminium represents from 10 to 25% by mass, and preferably from 15 to 20% by mass, of the mass of the incorporated plastic waste particles; the aluminium representing from 0.05 to 3% by mass, preferably from 0.1 to 1.5% by mass, and preferably from 0.2 to 1% by mass, of the mass of the bituminous composition; and in that the plastic waste is divided into domains whose D90 is less than 20 pm, in particular less than 18 pm, and preferably belonging to the range from 2 to 15 pm.

2. Bituminous composition comprising plastic waste, which comprises a polymeric part and aluminium, characterised in that the aluminium represents from 0.05 to 3% by mass, preferably from 0.1 to 1.5% by mass, and preferentially from 0.2 to 1% by mass, of the mass of the bituminous composition and the aluminium represents from 10 to 25% by mass, and preferentially from 15 to 20% by mass, of the mass of the plastic waste; and in that the plastic waste is divided into domains whose D90 is less than 20 pm, in particular less than 18 pm, and preferably belonging to the range from 2 to 15 pm.

3. Bituminous composition according to claim 1 or 2, characterized in that it has, after storage at 180°C for 3 days, a difference in ring-ball temperatures, measured according to standard NF-EN 13399, less than or equal to 5°C, and in that it has, after storage at 180°C for 3 days, a difference, measured according to standard NF-EN 13399, in needle penetrability at 25°C, less than or equal to 26 1 / 10 mm.

4. Bituminous composition according to any one of claims 1 to 3, characterized in that it has, after storage at 180°C for 3 days, a difference, measured according to standard NF-EN 13399, in needle penetrability at 25°C, less than or equal to 9 1 / 10 mm.

5. Bituminous composition according to any one of the preceding claims, characterized in that the mass of plastic waste present in the composition represents from 0.7 to 8% by mass, and preferably from 0.9 to 6% by mass, of the mass of the bituminous composition. tumorous.

6. Bituminous composition according to any one of the preceding claims, characterized in that the polymeric part of the plastic waste represents from 0.5 to 7% by mass, and preferably from 0.7 to 5% by mass, of the bituminous composition.

7. Bituminous composition according to any one of the preceding claims, characterized in that the polymeric part represents from 75 to 90% by mass, and preferably from 80 to 85% by mass, of the mass of the plastic waste.

8. Bituminous composition according to any one of the preceding claims, in which the plastic waste is distributed into domains with an average size of less than 14 pm, in particular into domains with an average size of less than 10 pm and, preferably, into domains with an average size in the range from 0.1 to 8 pm.

9. Bituminous composition according to any one of the preceding claims, characterized in that the plastic waste comes from food packaging(s).

10. Bituminous composition according to any one of the preceding claims, characterized in that the polymeric part of the plastic waste comprises at least one thermoplastic polymer chosen from polyethylene, ethylene vinyl alcohol and polypropylene.

11. Bituminous composition according to any one of the preceding claims, characterized in that the polymeric part of the plastic waste does not comprise high density polyethylene.

12. Bituminous composition according to any one of the preceding claims, characterized in that the bitumen base mass represents at least 60% by mass, preferably at least 70% by mass, preferably from 90 to 99.5% by mass, in particular from 92% to 99.3% by mass, and in particular from 94 to 99.1% by mass, of the mass of the bituminous composition.

13. Bituminous composition according to any one of the preceding claims, characterized in that it further comprises one or more additional polymers chosen from olefinic polymers and elastomers, in particular from olefinic polymers and crosslinked or crosslinkable elastomers, preferably representing from 0.05 to 10% by mass, preferentially from 0.1 to 8% by mass, and even more preferably from 0.3 to 6% by mass, of the mass of the bituminous composition.

14. Bituminous composition according to claim 1, characterized in that the plastic waste particles are, before incorporation into the bituminous composition, in the form of agglomerates from multi-layer waste, said multi-layer waste comprising at least one layer of aluminum associated with at least one layer of thermoplastic polymer.

15. A process for preparing a bituminous composition according to one of claims 1 to 14, comprising the incorporation, under mixing and heating at a temperature in the range from 120 to 200°C, into a bitumen base, of plastic waste particles which comprise a polymeric part and aluminium and in which the aluminium represents from 10 to 25% by mass, and preferably from 15 to 20% by mass, of the mass of the plastic waste incorporated.

16. Preparation process according to claim 15, characterized in that the mixing is carried out for a time and with suitable stirring, to obtain a homogeneous distribution and a dispersion of the plastic waste within the bituminous composition obtained.

17. Preparation process according to claim 15 or 16, characterized in that the incorporation and mixing are carried out under heating at a temperature belonging to the range from 150 to 180°C.

18. Preparation process according to any one of claims 15 to 17, characterized in that the incorporation of the plastic waste and the mixing are carried out under heating at a temperature higher than the melting temperature of the polymeric part of the plastic waste.

19. Preparation process according to any one of claims 15 to 18, characterized in that it comprises a step of mixing the bituminous composition with stirring at a speed of 100 to 600 revolutions / minute, preferably 200 to 400 revolutions / minute and for a period of 2 to 30 hours, preferably 6 to 24 hours, making it possible in particular to distribute the plastic waste in said composition.

20. Preparation process according to any one of claims 15 to 19, characterized in that it further comprises a prior step of reducing the size of the plastic waste particles, after their incorporation into the bitumen base, with stirring at a speed of 2000 to 6000 rpm, preferably 4000 to 5000 rpm and for a duration of 5 to 60 minutes, preferably 15 to 30 minutes.

21. Use of a bituminous composition according to any one of the Claims 1 to 14, for preparing a membrane or an impregnation layer.

22. Use of a bituminous composition according to any one of claims 1 to 14, as a bituminous binder in a surface coating, a hot mix, a cold mix, a cold-poured mix, an emulsion gravel or a wearing course, said binder being associated with aggregates and / or recycled millings.

23. Process for preparing a coating characterized in that it comprises the hot mixing of a bituminous composition according to any one of claims 1 to 14, with aggregates and / or recycled millings, and optionally mineral and / or synthetic fillers.

24. Coated material comprising a bituminous composition according to any one of claims 1 to 14, mixed with aggregates and / or recycled millings, and optionally mineral and / or synthetic fillers.

25. Asphalt comprising a bituminous composition according to any one of claims 1 to 14, mixed with mineral and / or synthetic fillers.

Images