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
  • E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
  • E01C7/325—Joining different layers, e.g. by adhesive layers; Intermediate layers, e.g. for the escape of water vapour, for spreading stresses
• • 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
• • 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
  • E01C11/16—Reinforcements
  • E01C11/165—Reinforcements particularly for bituminous or rubber- or plastic-bound pavings
• • 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

Definitions

• the invention relates to an improved anti-lift system of cracks inserted between the structure layer and the wearing course of a roadway. It relates still to a method for the realization of such a system.
• Road or airport roads are generally formed of several layers, namely a upper layer, called wearing course, based on a material of the surface coated type or even of the concrete type bituminous and one or more lower layers forming the structural layer of the pavement, based on materials treated with hydraulic binders such as cements, dairy blast furnace, pozzolan, fly ash, binders bituminous.
• the various mechanical and thermal stresses of a nature static, for example plug withdrawal and thermal withdrawal materials, or of a dynamic nature, namely constraints related to traffic, to which roadways are subject cause the structure layer to crack, the generated cracks transmitting more or less quickly to the wearing course and then appear on the surface of the latter.
• the presence of cracks on the surface of the pavement allows water to enter the body of said pavement, which causes rapid degradation and important of the latter.
• a more efficient solution consists of interposing, between the structural layer and the wearing course, an interface in non-woven geotextile impregnated with a bituminous binder consisting of a bitumen modified, for example, by a copolymer of styrene and a conjugated diene such as butadiene.
• a pavement covering with a geotextile sheet bonded, using a layer of bituminous adhesive, to the bituminous concrete base layer of a pavement, by example old road surface, said ply being covered with a porous wearing course at bituminous mix base.
• a layer can be arranged on the base layer in bituminous concrete to eliminate surface irregularities of said layer before laying the geotextile sheet.
• the anti-crack recovery system according to the invention which is sandwiched between the structural layer and the wearing course of a pavement, is of the type comprising a layer of a geotextile impregnated with a first bituminous binder and a layer of aggregates coated with a second bituminous binder, which is attached to the layer of geotextile impregnated with the first bituminous binder, and it characterized in that the second bituminous binder associated with aggregates, to form the asphalt layer, are used in an amount between 3% and 20% of the weight of aggregates.
• the system anti-crack recovery is arranged so between the structural layer and the wearing course of the pavement that the geotextile layer impregnated with the first bituminous binder rests on the structural layer of the pavement, while the layer of aggregates coated with second bituminous binder is coated with the layer of rolling.
• the system anti-crack recovery is arranged so between the structural layer and the wearing course of the pavement as the layer of aggregates coated with the second binder bituminous rests on the structure layer of the roadway, while the geotextile layer impregnated with the first bituminous binder is coated with the wearing course.
• the layer of aggregates coated with the second binder bituminous can advantageously be a layer of sand coated with said binder.
• geotextile is meant according to the invention any tight texture textile tablecloth, which is produced at from natural or synthetic yarns or fibers and that we usually use in the operations of road construction and land stabilization.
• the geotextile used according to the invention consists of a nonwoven web formed of filaments continuous based on a polymer such as polyester, isotactic polypropylene, polyamide, polyacrylonitrile, cellulose acetate, polyvinyl chloride, polychloride vinylidene.
• a geotextile consisting of a tightly woven nonwoven tablecloth formed of continuous polypropylene-based filaments isotactic, or a polyester, in particular polyalkylene glycol terephthalate such as polyterephthalate ethylene glycol, or a polyamide, in particular polycaproamide or polyhexamethylene adipamide.
• the tablecloth no woven formed of continuous filaments based on a polymer can be in particular the tablecloth described in one or the other of the citations FR-A-1601049, FR-A-2108145 and FR-A-2592411, said citations indicating the general method of production of such a tablecloth.
• the surface mass of the textile sheet constituting the geotextile can vary quite widely and is advantageously between 50 and 500 g / m 2 .
• the surface mass of said textile web is preferably between 100 and 300 g / m 2 .
• the first bituminous binder which permeates the geotextile to form the impregnated geotextile layer of the anti-crack rise system, is used advantageously in an amount between 200 g and 1500 g and preferably between 300 g and 1000 g per square meter of geotextile sheet.
• the second bituminous binder associated with aggregates, to form the layer of coated aggregates of the anti-lift system of cracks, is more particularly used in quantity included between 4 and 12% of the weight of the aggregates.
• the aggregate component can be chosen from the various sands that are used on construction sites and whose 6 mm sieve pass is greater than 80% and preferably equal to 100%.
• the aggregate component selected from sands which are used on road construction sites and whose passer-by 6 mm sieve is greater than 80%, is coated with the second bituminous binder, used in aqueous emulsion, after have been previously contacted with a solution surfactant and possibly with a quantity of cement less than 3% of the weight of the sand forming the component aggregate.
• the component aggregate chosen from the gravel that is used on road works and including the passer by a 20 mm sieve is greater than 90%, is hot-coated with the second binder bituminous so as to provide, after compaction, a vacuum content in the mix between 15% and 35% and preferably between 20% and 30%.
• the first bituminous binder which permeates the geotextile, as well as the second bituminous binder, which coats the aggregates, can be of identical natures or different and are chosen from bitumens and bitumens modified by polymers, which have a viscosity dynamic at 100 ° C between 0.4 Pa.s and 25 Pa.s and from preferably between 0.7 Pa.s and 20 Pa.s.
• the first and second bituminous binders can be chosen in particular from bitumens modified with copolymers of styrene and a conjugated diene and especially among bitumens modified with block copolymers of styrene and a diene conjugate such as butadiene, isoprene, carboxylated butadiene, the preparation of which is described in the citations FR-A-2376188, FR-A-2429241, FR-A-2528439 and FR-A-2636340.
• the geotextile or coating the granules with the chosen bituminous binder can be used either in the molten state or under the form of an aqueous emulsion, for example emulsion described in one or other of the citations FR-A-2517317, FR-A-2577545 and FR-A-2577546.
• a method for producing an anti-rising crack system according to the invention, sandwiched between the structure layer and the wearing course of a roadway, said system comprising a layer of a geotextile impregnated with a first bituminous binder and attached to a layer of aggregates coated with a second bituminous binder, is of the type in which one of the layers of the crack prevention system on the layer of pavement structure, then we coat the layer as well formed using the other layer of the anti-lift system cracks and apply the wearing course on the assembly thus formed and it is characterized in that, in the layer of aggregates coated with the second bituminous binder, the amount of said binder is between 3% and 20% and more particularly between 4% and 12% of the weight of the aggregates.
• the road surface which rests on the anti-rising crack system, can be anything type known in the art, the binder used for this layer of bearing being a pure bitumen or a modified bitumen by a polymer and in particular by a copolymer of styrene and a conjugated diene such as butadiene, isoprene or butadiene carboxylated.
• the pavement structure layer When the pavement structure layer is cracked, it is useful to plug the most wide, for example cracks wider than 2 mm, at using a bridging agent consisting of a putty bituminous before applying, on said layer of structure, the first layer, namely impregnated geotextile or aggregates coated, as appropriate, with the anti-lift system cracks.
• a bridging agent consisting of a putty bituminous before applying, on said layer of structure, the first layer, namely impregnated geotextile or aggregates coated, as appropriate, with the anti-lift system cracks.
• the layer of aggregates coated with the second binder bituminous which constitutes one of the two layers of the system anti-crack recovery according to the invention has a thickness can be between 1 cm and 6 cm.
• test pieces used each consisted of a multilayer rectangular plate, said plate having a length of 560mm and a width of 110mm and comprising a pre-cracked support layer along its transverse axis simulating the cracked structural layer of a roadway and an apparent layer simulating the wearing course of the pavement, this last layer resting directly on the pre-cracked support layer or being separated from this layer support by an anti-rising crack system.
• test tubes tests to determine the ascent rate of the support layer crack in the test layer simulating the wearing course.
• test piece submitted to the test was mounted on the test machine so that that one of the halves of the free face of the support layer transversely prefissured of the test piece was glued on one of the flat support elements and that the other of said halves was glued to the other of said support elements plans.
• test pieces used during the tests had the following structures: EXAMPLE 1 : two-layer test pieces not comprising an anti-rising crack system, said test pieces being formed from a prefissured support layer 15 mm thick directly surmounted by a wearing layer 50 mm thick.
• EXAMPLE 2 test pieces comprising a pre-cracked support layer 15 mm thick and a wearing layer 30 mm thick between which was interposed a witness system anti-crack recovery consisting of a geotextile sheet impregnated with a bituminous binder of bitumen / polymer type.
• EXAMPLE 3 test pieces comprising a pre-cracked support layer 15 mm thick and a wearing layer 30 mm thick between which was interposed an anti-crack recovery system according to the invention, said system being formed of a layer consisting of a geotextile sheet impregnated with a bituminous binder of the bitumen / polymer type resting on the support layer and surmounted by a layer of 20 mm thick of sand coated with a bitumen / polymer binder, this layer of coated sand being surmounted by the wearing course.
• the transverse pre-cracked support layer of various test pieces were made from the same concrete bituminous based on sand, bitumen and sulfur.
• the wearing course of the various test pieces consisted of a discontinuous 0/10 bituminous concrete formed of 6 parts by weight of a bitumen / polymer composition vulcanized with sulfur and 100 parts by weight of a mixture made by weight of 60% gravel 6 / 10mm, 10% sand 0 / 4mm, 27.5% 0 / 2mm sand and 2.5% filler fines (80% said fines passing the 80 ⁇ m sieve and 100% passing the 315 ⁇ m sieve).
• bitumen / polymer composition used for the realization of the wearing course of the test specimens was prepared as follows. We mixed at 170 ° C and below stirring, 100 parts by weight of a bitumen 180/220 of penetration equal to 200 with 3 parts by weight of a butadiene / styrene block copolymer having a mass molecular viscosimetric mean equal to 75000 and a styrene content by weight equal to 25%, then after 3.5 hours of mixing was added 0.1 part by weight of sulfur to the mass obtained and stirring was continued at the temperature of 170 ° C for another 30 minutes.
• the bitumen / polymer composition obtained had a dynamic viscosity at 100 ° C equal to 8.5 Pa.s.
• the geotextile sheet impregnated with bituminous bitumen / polymer binder used in the test pieces of Examples 2 and 3, consisted of a sheet of a nonwoven of isotactic polypropylene yarns having a grammage of 170 g / m 2 impregnated with 900 g / m 2 d 'a bitumen / polymer binder having a dynamic viscosity at 100 ° C equal to 1 Pa.s, said binder being applied to the web in the form of an aqueous emulsion.
• This bitumen / polymer binder was prepared as follows. We first formed a stock solution by incorporating, 100 ° C and with stirring, 2.4 parts by weight of sulfur orthorhombic crystallized and 62 parts by weight of styrene / butadiene block copolymer defined above at 230 parts by weight of a character oil cut naphtheno-paraffinic having an initial point and a point final distillation ASTM (ASTM standard D8 667) equal respectively at 162 ° C and 233 ° C, said incorporation being completed in 1 hour. The stock solution thus obtained was then incorporated into 1950 parts by weight of a bitumen of penetration equal to 82, maintained at 170 ° C. with stirring, after which the mixture thus produced was still maintained with stirring at 170 ° C for 30 minutes.
• Bitumen / fluidized polymer binder (viscosity dynamic at 100 ° C equal to 1 Pa.s) thus obtained was then put into an aqueous emulsion as indicated in Example 3 of the FR-A-2577546 to produce the binder emulsion bitumen / polymer used to impregnate the geotextile sheet.
• the layer of sand coated with bitumen / polymer binder present in the test tubes of Example 3 was formed of 9 parts by weight of bitumen / polymer binder consisting of same bitumen / polymer composition as that used in the constitution of the wearing course and 100 parts in weight of a mixture consisting, by weight, of 44% of gravette 2/6 mm, 53% 0 / 2mm sand and 3% of the same filler fines nature than those used to produce the layer of rolling.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Road Paving Structures (AREA)
• Ceramic Products (AREA)
• Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
• Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
• Laminated Bodies (AREA)
• Processing Of Solid Wastes (AREA)
• Disintegrating Or Milling (AREA)
• Road Repair (AREA)
• Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)

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Publications (2)

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• 1992
  • 1992-07-07 FR FR9208366A patent/FR2693490B1/fr not_active Expired - Fee Related
• 1993
  • 1993-07-05 ES ES09450005A patent/ES2112746B1/es not_active Expired - Fee Related
  • 1993-07-05 BR BR9305576A patent/BR9305576A/pt not_active IP Right Cessation
  • 1993-07-05 EP EP93914814A patent/EP0603369B1/fr not_active Expired - Lifetime
  • 1993-07-05 DE DE69317989T patent/DE69317989D1/de not_active Expired - Lifetime
  • 1993-07-05 WO PCT/FR1993/000690 patent/WO1994001623A1/fr active IP Right Grant
  • 1993-07-05 AT AT93914814T patent/ATE165130T1/de not_active IP Right Cessation
  • 1993-07-05 US US08/204,178 patent/US5445473A/en not_active Expired - Lifetime
  • 1993-07-05 JP JP6503033A patent/JPH07501371A/ja active Pending
  • 1993-07-05 CA CA002117087A patent/CA2117087A1/en not_active Abandoned
• 1994
  • 1994-03-04 FI FI941042A patent/FI941042A/fi unknown

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