Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
  • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
  • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
  • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
  • E01C19/1027—Mixing in a rotary receptacle
  • E01C19/1036—Mixing in a rotary receptacle for in-plant recycling or for reprocessing, e.g. adapted to receive and reprocess an addition of salvaged material, adapted to reheat and remix cooled-down batches
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
  • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
  • E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving

Definitions

• the present invention relates to a high-modulus bituminous mix according to standard NF P 98-140 or NF EN 13108-1 obtained from recycling materials, and more particularly from recycling charges for roadway materials.
• the invention also relates to the use of these high-modulus bituminous mixes, in the preparation of road pavements, in particular in the preparation of base layers or roadbed layers.
• bituminous mixes a few centimeters thick. After a number of years, these coatings age due to deformations caused by traffic, weather conditions and light. These different parameters result in hardening of the bituminous mix by evaporation of the lightest fractions of the bituminous binder contained in said bituminous mix. This results in a weakening of the bituminous mix which becomes brittle and has a tendency to crack. It is therefore necessary to treat the pavement surface after a number of years.
• One solution is to mill the surface of the bituminous mix with a machine and replace it with a new bituminous mix. During this operation, pavement materials called "costs" are recovered.
• bituminous mixes described have a modulus of rigidity equivalent to that of a severe bitumen according to standard NF P 98-138.
• bituminous mixes including costs to obtain high modulus bituminous mixes (EME) according to standard NF P 98-140 or NF EN 13108-1.
• Another object of the invention is to provide bituminous mixes comprising mills having performance equivalent to or greater than that of high-modulus bituminous mixes (EME), particularly with regard to the resistance to rutting, of the modulus of rigidity, fatigue resistance and resistance to cracking.
• Another object of the invention is to provide high modulus bituminous mixes (EME) comprising costs for reducing the thickness of bituminous mixes.
• Another object of the invention is to provide high modulus mixes (EME) comprising costs to increase the life of bituminous mixes.
• EME high modulus mixes
• the present invention relates to a high modulus bituminous mix according to standard NF P 98-140 or NF EN 13108-1 based on recycling charges for roadway materials comprising residual bituminous binder, based on new aggregates and based on bituminous binder, said mix comprising between 40 and 60% by weight of blends and 5.5 to 6.5% by weight of bituminous binder (residual bituminous binder and bituminous binder), relative to to the total mass of bituminous mix.
• the high-modulus bituminous mix has a modulus of stiffness E *, measured at 15 ° C and 10 Hz, greater than 15.10 3 MPa and an alternating flexural fatigue resistance ⁇ 6 at 10 0 C and 25 Hz , greater than 140.10 "6 .
• the high modulus bituminous mix comprises between 40 and 60% by weight of new aggregates, relative to the total weight of the bituminous mix.
• the charges have a residual bituminous binder content of between 2 and 6% by weight, relative to the total mass of the costs.
• the residual bituminous binder of the charges has a penetrability at 25 ° C. of between 5 and 40 1/10 mm, preferably between 10 and 30 1/10 mm.
• bituminous binder content is between 1 and 5% by weight, relative to the total weight of the bituminous mix.
• the bituminous filler has a penetration at 25 ° C between 10 and
• bituminous binder (residual bituminous binder and bituminous binder) has a penetrability at 25 ° C of between 10 and 1/10 mm, preferably between 15 and 25 1/10 mm.
• the vacuum content according to the NF P 98-252 standard is less than or equal to 5%.
• the invention relates to the use of high modulus bituminous mix as defined above in the road industry, for the production of base layers or pavement layers for pavements.
• the invention relates to a method for preparing a high modulus bituminous mix as defined above, said method comprising mixing, at a temperature of between 12O 0 C and 220 ° C, preferably between
• the charges are introduced after the mixing of the new aggregates and the bituminous binder.
• the invention relates to a bituminous mix based on mills, new aggregates and bituminous binder having the performance of a high modulus bituminous mix.
• High modulus bituminous mixes or "EME" are defined in standard NF P 98-140 or NF EN 13108-1.
• High modulus bituminous mixes are distinguished from other bituminous mixes in terms of rigidity modulus, rut resistance and fatigue resistance.
• the name EME translates, in standards NF P 98-140 or NF EN 13108-1, by one or more of the following minimum performances:
• EMEs mechanical performance superior to most bituminous mixes.
• EMEs thus have the ability to withstand creep and traffic-related efforts and to maintain the properties of the bituminous mix according to the repetition of the application of the charges, which gives the material a high resistance to the phenomenon of ruin by fatigue.
• the mechanical characteristics of EMEs also allow them to have a reduced thickness compared to conventional bituminous mixes, while retaining good properties.
• EMEs are generally used at thicknesses of 5 to 12 cm, preferably 6 to 8 cm. The thickness depends on the particle size of the mixture.
• EME of particle size 0/10 that is to say aggregates whose dimensions are less than 10 mm
• the thickness is 6 to 8 cm.
• the thickness is 7 to 13 cm.
• the thickness is 9 to 15 cm.
• EMEs are generally used for foundation layers and basecoats.
• EMEs are conventionally formulated from bituminous binder and new aggregates.
• charges are added.
• the bituminous mixes according to the invention comprise at least 30% of costs, relative to the total mass of the bituminous mix.
• the bituminous mix comprises between 30 and 70% by weight of charges, relative to the total mass of the mix, more preferably between 40 and 60% by weight.
• the term "mills” means pavement materials obtained by milling the surface of roads.
• the costs are thus mixtures bituminous binding / aggregates.
• the charges are aggregates covered with a film of bituminous binder.
• This bituminous binder present in the mills is called a "residual" bituminous binder, as opposed to the bituminous binder additionally added to the new aggregates to form the bituminous mixes according to the invention.
• This residual bituminous binder is generally a bitumen which has aged, has been oxidized and therefore has low penetrability. It is possible to know the content and the penetrability of the residual binder of the costs by extraction of the binder.
• the charges used have a residual bituminous binder content of 2 to 6% by weight relative to the total mass of the charges, preferably 4 to 6% by weight relative to the total mass of the costs.
• the penetrability at 25 0 C of the residual bituminous binder costs is between 5 and 40 1/10 mm, preferably between 10 and 30 1/10 mm (according to standard NF EN 1426).
• the residual bituminous binder is therefore a particularly hard binder.
• To obtain a particularly hard residual bituminous binder it is possible to mill roads composed of draining asphalt.
• the draining mixes are asphalts with a high void content, they are mixes whose binder oxidizes more easily, and therefore mixes whose binder is particularly hard.
• the granulometry of the charges is between 0 and 20 mm, preferably between 0 and 14 mm, preferably between 0 and 10 mm. To be able to be within the specified size ranges, the charges may be crushed and sieved.
• the bituminous mix according to the invention also comprises new aggregates.
• bituminous mixes comprise between 30 and 70% by weight of new aggregates, relative to the total weight of the bituminous mix, preferably between 40 and 60% by weight.
• the new aggregates according to the invention have usual particle sizes 0/10, 0/14, 0/20.
• the chemical nature of the aggregates does not pose any particular problems.
• Calcareous or predominantly calcareous aggregates are preferred.
• the mechanical and manufacturing characteristics, concerning the angularity, the cleanliness of the aggregates are specified in the standard XP P 18-540.
• the bituminous mix according to the invention optionally comprises a mineral filler portion having a particle size of less than 63 ⁇ m added to the other granular fractions.
• the bituminous mix according to the invention comprises between 1 and 5% by weight of filler, relative to the total weight of the mix, preferably between 1 and
• the new aggregates, the filler and the mills constitute the granular skeleton of the bituminous mix. It is necessary to know the particle size of each of these constituents in order to be able to develop a particle size curve of the type of a high modulus bituminous mix.
• the bituminous binder additionally supplies the residual bituminous binder provided by the costs.
• This bituminous binder just like the residual bituminous binder, consists of pure bitumen, modified bitumen or special bitumen, taken alone or mixed.
• bitumen of natural origin those contained in deposits of natural bitumen, natural asphalt or oil sands.
• the bitumens according to the invention are also bitumens derived from the refining of crude oil. Bitumens come from the atmospheric and / or vacuum distillation of oil. These bitumens can be optionally blown, vis-reduced and / or deasphalted.
• bitumens according to the invention may also be bitumen called “synthetic", pigmentable or colorable, containing no or little asphaltenes.
• the bitumens may be bitumens / polymers containing optionally crosslinked elastomers or plastomers. Fluxed bitumens may also be used with petroleum oils and / or vegetable oils.
• the residual bituminous binder can of course come from the various bitumens mentioned above, taken alone or in mixtures.
• the bituminous binder content is between 1 and 5% by weight, relative to the total weight of the bituminous mix.
• bituminous binder whose penetrability is between 10 and 50 1/10 mm, preferably between 20 and 30 1/10 mm (according to standard NF EN 1426).
• the penetrability of the bituminous binder is between 10 and 1/10 mm, preferably between 15 and 25 1/10 mm (according to standard NF EN 1426).
• the penetrability of the bituminous binder is very important, the bituminous binder must be particularly hard.
• the amounts of residual bituminous binder and of bituminous binder, as a function of their penetrability, will be adjusted to obtain a bituminous binder in the end, which is particularly hard, that is to say, according to the invention, a bituminous binder in the end. having a penetrability is between 10 and 1/10 mm, preferably between 15 and 25 1/10 mm, preferably around 1/10 mm.
• bituminous binder residual bituminous binder and bituminous binder
• the total content of bituminous binder is extremely important and must be between 5.5 and 6.6% by mass relative to the weight of the bituminous mix to obtain the EME according to the invention.
• the selection of this particular range for the bituminous binder content gives the bituminous mixes particularly good mechanical properties especially in rut resistance, fatigue resistance and rigidity modulus.
• Bituminous mixes according to the invention have the properties of EME and even properties superior to EME.
• the EMTs according to the invention have both a rigidity modulus E *, measured at 15 ° C. and at 10 Hz, greater than 15 ⁇ 10 3 MPa and an alternating flexural fatigue strength, at 10 ° C. and at 25 ° C. Hz, greater than 140. 10 "6 .
• EMEs according to standard NF P 98-252 is less than 5%.
• These high-modulus bituminous mixes are therefore particularly resistant and indicated for their use in particular in the road industry, for the production of base layers or pavement layers for pavements.
• new aggregates possibly the filler, of the bituminous binder and blends are mixed.
• the new aggregates and optionally the charge are dried in an oven at a temperature between 160 ° C and 18O 0 C for a duration greater than 16 hours.
• the charges must not be heated for so long, to avoid the effect of agglomeration, clumping of the costs.
• the drying time is less than 8 hours.
• the new aggregates After drying of new aggregates, and optionally filler, and milled, are mixed at a temperature between 120 ° C and 220 0 C 5 preferably between 16O 0 C and 180 0 C, the new aggregates, optionally of the load , mills and bituminous binder.
• the new aggregates are first mixed, possibly with the filler with bituminous binder, and then the charges are added.
• the method comprises the following steps:
• step (iii) mixing the new aggregates and optionally the filler, at a temperature of between 180 ° C. and 180 ° C. for a few seconds, (iv) adding, at a temperature of between 160 ° C. and 180 ° C., the bituminous binder; adding to the mixture obtained in step (iii) and mixing for 5 to 10 seconds,
• step (v) adding the blends to the mixture obtained in step (iv) and mixing from 60 to 90 seconds.
• the bituminous mixes are prepared in the following manner: the charges are brought to the temperature of 18O 0 C for a duration of about 8 hours, the new aggregates and the calcareous load are brought to the temperature of 18O 0 C for a longer duration at 16 o'clock, the new aggregates and the calcareous filler are mixed in a thermoregulated mixer type LPC 85 L at 18O 0 C for 10 seconds, the bituminous binder addition to 18O 0 C is added and the bituminous binding additive / aggregates new The batch is blended at 180 ° C for 10 seconds, the blends are then added and mixed with the bituminous binder / new aggregate / filler at 180 ° C for 90 seconds.
• the mass concentrations of the various constituents are given in Table I below. The values are given as a percentage by mass throughout the bituminous mix.
• PCG Compressive shear press compactability test
• Gyratory shear press (GCP) compaction tests yielded void rates of 1.5-5.0%. All bituminous mixes are therefore quite compact and meet the EME standard.
• the Duriez de-coating tests show that the adhesion between the bituminous binder and aggregates is good enough for all bituminous mixes and that they therefore meet the EME standard.
• the shading tests give rut values of 0.9 to 4% with respect to the thickness of the test piece (10 cm), ie from 0.9 to 4 mm. All bituminous mixes meet the EME standard and therefore have good hot performance.
• bituminous binder content bituminous feedstock + residual bituminous binder
• bituminous mix T 2 too rich in binder
• Bituminous mixes according to the invention A, B, C have modules greater than 14000 MPa.
• these high module values make it possible to envisage reductions in pavement thickness, all the more so since the value of the module is high.
• bituminous mixes Tj and T 2 do not simultaneously exhibit good behavior in terms of modulus of rigidity and fatigue resistance, and can not be considered as EMEs. Only the bituminous mixes according to the invention, the bituminous binder content of which has been adjusted simultaneously exhibit good behavior in the form of modulus of rigidity and fatigue resistance, and are therefore comparable to EMEs.
• the bituminous asphalt that is better able to withstand the forces, able to maintain its properties according to the repetition of the application of the fillers and allowing a greater reduction of the roadway thicknesses, is bituminous asphalt A.
• the performance of bituminous mixes according to the invention were not degraded by the addition of costs and are even comparable to those of conventional EMEs without charges. It is therefore possible to combine mechanical performance and sustainable development with bituminous mixes according to the invention.
• Asphalt mixes A and T 2 were then compared using the French pavement design method developed by SETRA using "Alizé" software. This method compares the long-term behavior of pavement structures including asphalt mix for different traffic and climate conditions. For a given traffic and a given lifetime, the software gives an estimate of the thickness that the asphalt must have (taking into account complex modulus and fatigue values). For each mix, the assumptions are as follows: a traffic of 600 trucks per day for 30 years with an annual geometric increase of 2%, a pavement structure including a thickness in cm "x" of asphalt on a platform support PF3 of 120 MPa lift, asphalt and the platform is not glued.
• the software "Alizé” gives a thickness of "x" asphalt of 12 cm for the asphalt A. Under the same traffic conditions, the thickness "x" of the asphalt T 2 is 21 cm.
• the mix A according to the invention will therefore be able to withstand a traffic of 600 trucks per day for 30 years with a thickness almost twice as low as that of the mix T 2 under the same conditions.
• the asphalt A according to the invention thus makes it possible to significantly reduce the thickness of the roadway, while being also resistant.

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• Chemical & Material Sciences (AREA)
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• Organic Chemistry (AREA)
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• Road Paving Structures (AREA)
• Compositions Of Macromolecular Compounds (AREA)

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• 2008
  • 2008-10-14 FR FR0805672A patent/FR2937059A1/fr not_active Withdrawn
• 2009
  • 2009-10-12 EP EP09744740A patent/EP2337819A1/de not_active Withdrawn
  • 2009-10-12 WO PCT/IB2009/007110 patent/WO2010043945A1/fr active Application Filing

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