Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C7/00—Coherent pavings made in situ
  • E01C7/08—Coherent pavings made in situ made of road-metal and binders
  • E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
  • E01C7/185—Isolating, separating or connecting intermediate layers, e.g. adhesive layers; Transmission of shearing force in horizontal intermediate planes, e.g. by protrusions
• • 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
  • E01C11/00—Details of pavings
  • E01C11/005—Methods or materials for repairing pavings

Definitions

• the present invention relates to a new pavement structure, made from rigid materials.
• these layers can be laid directly on the ground, but also on an untreated material, such as, for example, an untreated gravel or a moistened reconstituted gravel.
• the new layer or layers of treated materials are placed directly in contact with the upper layer of the old pavement.
• the Applicant has established that, when the stiffness modulus of the seat layer is high, the surface condition of the base of the seat layer, in particular the reduction of "intaglio" defects of this, has an effect on the formation of microcracks, and therefore on the mechanical fatigue strength of the pavement causing failure problems.
• the object of the present invention is therefore to obtain a floor comprising a rigid seat layer, which has improved fatigue resistance, that is to say which withstands well the high stresses transmitted by vehicles on the floor .
• the Applicant has highlighted the fact that it is possible, surprisingly, to obtain a good quality pavement, having a long service life and which can be built on a even damaged support, by incorporating a layer particular under the rigid seat layer.
• said pavement structure being characterized in that it comprises, under the seat layer, the modulus of rigidity of which is greater than or equal to 14.10 3 MPa, a layer adhering thereto and the thickness of which is such that it constitutes for the seat layer a support with a smooth and flat surface.
• the stiffness modulus is measured according to the TOTAL 762-94 method.
• the wearing course resting on the rigid seat layer can advantageously be a traditional asphalt, such as, for example, bituminous concrete.
• the role of this wearing course is to ensure good protection of the structure and, by its roughness, good adhesion for vehicles.
• the rigid seat layer of the structure according to the invention has a stiffness modulus greater than or equal to 14.10 3 MPa at 15 ° C and 10 Hz and can be made from bituminous materials of the coated type with high modulus, by for example, or based on materials treated with hydraulic binders, such as gravel-cements or gravel-slag.
• This layer The role of this layer is to provide a good foundation for the road.
• a seat layer constituted by a bituminous mix of coated type with very high modulus of rigidity, developed by the Applicant and which is the subject of French patent application N ° 95 10097.
• This bituminous mix is produced from a very hard binder, whose penetrability at 25 ° C, measured according to AFNOR standard NFT 66-004, is between 0 and 20 and whose content in the mix is more than 6 parts percent by weight.
• this asphalt mix Due to its very rigid nature, its modulus of rigidity at 25 ° C and 10 Hz being greater than 24.10 3 MPa, this asphalt mix provides the same structural effect as conventional materials, but with much smaller thicknesses, from 5 to 30 cm.
• the layer which is placed under the seat layer must fill in the hollows and the reliefs of the ground, of the untreated material, or of the pavement to be reinforced, on which it rests. This layer must therefore have a sufficient thickness to cover these irregularities, so as to form for the seat layer a support with a smooth and flat surface.
• This layer must, in addition, adhere to the seat layer so that the final pavement has good mechanical behavior, in particular with respect to mechanical fatigue.
• Adhesion can be natural, if the layer is made from a sufficiently bituminous material.
• the layer according to the invention which is placed under the seat layer, can be produced from several types of material.
• a first family of usable materials includes bituminous mixes, such as, for example, bituminous sand, reprofiling mixes, cold mixes or bituminous concretes.
• these materials once used, must have a low macroroughness and a good level.
• the macroroughness is defined by a height of sand less than or equal to 4 mm, and preferably less than or equal to 2 mm, measured by the sand height test according to standard NFP 98-216-1.
• This layer could, for example, be bonded to the base layer with a bonding layer produced from a 70/100 bitumen emulsion, dosed at 300-400 g / m 2 with residual binder.
• a second family of materials which can be used to produce the layer to be placed under the base layer comprises flowable bituminous materials, such as, for example, cold-cast mixes, bituminous grouts or poured asphalts.
• these materials must have a low macroroughness, of the order of that possessed by the bituminous mixes mentioned above.
• the layer produced from these flowable bituminous materials is also applied according to standard NFP 98-150, which gives it the desired level of evenness.
• Bonding with the base layer is ensured by spreading a bonding layer produced from an emulsion of bitumen 70/100, for example, and at a rate of 200 to 500 g / m 2 in residual binder.
• a third family of materials that can be used as a layer to be placed under the seat layer includes non-bituminous materials.
• geotextiles that is to say any textile fabric of tight texture, which is produced from natural or synthetic yarns or fibers and which is normally used in construction operations. road and land stabilization.
• the geotextile used according to the invention can be a nonwoven web with a surface mass of between 50 and 500 g / m 2 and formed of continuous filaments based on a polymer such as a polyester, an isotactic polypropylene, a polyamide, a polyacrylonitrile, cellulose acetate, polyvinyl chloride, polyvinylidene chloride or even high density polyethylene.
• a polymer such as a polyester, an isotactic polypropylene, a polyamide, a polyacrylonitrile, cellulose acetate, polyvinyl chloride, polyvinylidene chloride or even high density polyethylene.
• a geotextile consisting of a nonwoven web of tight texture, formed of continuous filaments based on isotactic polypropylene, or else of a polyester, in particular of polyethylene terephthalate glycol such as polyethylene terephthalate, or else a polyamide, in particular a polycaproamide or a polyhexamethylene adipamide.
• the nonwoven web formed from continuous filaments based on a polymer can be, in particular, the web described in one or other of the publications FR-A-1 601 049, FR-A-2 108 145 and FR-A-2 592 411, these publications indicating the general method of production of such a sheet.
• the geotextile can also be a woven sheet with a surface mass of between 50 and 500 g / m 2 and with a mesh diameter less than or equal to 5 mm, so as to give a smooth character.
• the impregnation rate is between 200 and 800 g / m 2 .
• This impregnation is carried out with hot bitumen or with a bitumen in the form of an emulsion, the penetration of the bitumen at 25 ° C. is between 180 and 220 tenths of a millimeter.
• geomembranes such as polymer films, grouts with hydraulic binders, carpets of waste agglomerated with organic or mineral binders, or else layers treated with hydraulic binders.
• these non-bituminous materials must have a low macroroughness, of the order of that possessed by the bituminous mixes mentioned above.
• This bonding layer after spreading and breaking the emulsion, is dosed at 200-500 g / m 2 with residual binder.
• This material is also perfectly suitable, both for the construction of new pavements and for the reinforcement of existing pavements.
• the layer to be placed under the base layer can be laid either directly on the ground, or on an untreated material, for example of the untreated or serious reconstituted type, humidified.
• pavement structures not only have a significantly improved fatigue resistance compared to the structures of the prior art, but they also have the advantage of not requiring complicated or costly implementation, since they can be produced by known conventional means.
• This example relates to a bituminous coated material, the Applicant of which recommends the use for the construction of a pavement, as a layer to be placed under the rigid foundation layer of the pavement.
• bitumen sand used in the form of a hot mix, prepared from a bitumen playing the role of binder whose penetrability at 25 ° C is between 35 and 50 tenths of a millimeter .
• the penetrability is measured according to AFNOR NFT 66-004 standard.
• the macroroughness of this bitumen sand is defined by a height of sand, according to standard NFP 98-216-1, of the order of 3 mm.
• This bitumen sand has a richness module of between 2.8 and 3.0, a bitumen content of 5.2 parts per cent by weight, a particle size of between 0 and 6 or between 0 and 10 mm, of the type: % passing Sieve opening diameter 15 0.08mm 64 0.2mm 77 0.717 mm 91 0.5mm 97 1 mm 100 2 mm
• This layer of bitumen sand is implemented according to standard NFP-98-150, which gives it a good level, and has a final thickness of 2 cm, after cooling and spreading of a bonding layer of bituminous emulsion type. dosed at 250-300 g / m 2 with residual binder.
• This example relates to a bituminous coated material, which the Applicant recommends using for the reinforcement of a roadway, as a layer to be placed. under the rigid base layer of new pavement and on a pavement to be reinforced.
• This asphalt has a sandy character and a particle size between 0 and 6 mm or between 0 and 10 mm, of the type: % passing Sieve opening diameter 0/6 0/10 12 10 0.08mm 60 50 2 mm 100 80 6.3 mm
• This mix has a richness module k greater than or equal to 3.0, if the mix has a particle size between 0 and 6 mm, and greater than or equal to 2.8, if the mix has a particle size between 0 and 10 mm.
• This example relates to a material of the flowable bituminous material type, the Applicant of which recommends the use for the construction of a new roadway, as a layer to be placed under the rigid seat layer of the roadway.
• This asphalt has a macroroughness, defined by a height of sand according to standard NFP-98-216-1, of the order of 4 mm.
• This layer is used according to standard NFP-98-150, which gives it a good level, with a bonding layer of the cationic emulsion type, prepared from a bitumen of penetrability of between 70 and 100 tenths of millimeter, dosed at 200-500 g / m 2 with residual binder.
• This example relates to a geotextile type material, the Applicant of which recommends the use for the construction of a new roadway, as a layer to be placed under the rigid seat layer of this new roadway.
• the polyester fibers have a weight of 80 g / m 2 , a mechanical strength of 2 kN / m and an elongation of 40%.
• the glass grid has a weight of 55 g / m 2 , a mechanical strength of 14 kN / m and an elongation of 3%.
• the impregnation rate of this geotextile is 600 g / m 2 , with a bitumen emulsion of penetrability between 180 and 220 tenths of a millimeter.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Road Paving Structures (AREA)
• Vehicle Body Suspensions (AREA)
• Road Signs Or Road Markings (AREA)
• Road Paving Machines (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=9490647

Family Applications (1)

Country Status (12)

Cited By (1)

Families Citing this family (34)

Citations (3)

Family Cites Families (14)

• 1996
  • 1996-03-28 FR FR9603871A patent/FR2746821B1/fr not_active Expired - Fee Related
• 1997
  • 1997-03-17 ZA ZA9702296A patent/ZA972296B/xx unknown
  • 1997-03-19 DE DE69722300T patent/DE69722300T2/de not_active Expired - Fee Related
  • 1997-03-19 ES ES97400612T patent/ES2202562T3/es not_active Expired - Lifetime
  • 1997-03-19 DK DK97400612T patent/DK0798417T3/da active
  • 1997-03-19 AT AT97400612T patent/ATE241734T1/de not_active IP Right Cessation
  • 1997-03-19 EP EP97400612A patent/EP0798417B1/de not_active Expired - Lifetime
  • 1997-03-19 PT PT97400612T patent/PT798417E/pt unknown
  • 1997-03-26 CA CA002201095A patent/CA2201095C/fr not_active Expired - Fee Related
  • 1997-03-27 CN CNB971033838A patent/CN1266343C/zh not_active Expired - Fee Related
  • 1997-03-28 US US08/828,369 patent/US6158920A/en not_active Expired - Fee Related
  • 1997-03-28 JP JP9078286A patent/JPH111901A/ja active Pending

Patent Citations (3)

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