EP1012395A1 - Grid-type reinforcement for strengthening road structures, in particular made of bitumen - Google Patents

Grid-type reinforcement for strengthening road structures, in particular made of bitumen

Info

Publication number
EP1012395A1
EP1012395A1 EP98942757A EP98942757A EP1012395A1 EP 1012395 A1 EP1012395 A1 EP 1012395A1 EP 98942757 A EP98942757 A EP 98942757A EP 98942757 A EP98942757 A EP 98942757A EP 1012395 A1 EP1012395 A1 EP 1012395A1
Authority
EP
European Patent Office
Prior art keywords
reinforcement
grid
nonwoven
road structures
deposited
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98942757A
Other languages
German (de)
French (fr)
Other versions
EP1012395B1 (en
Inventor
Daniel Doligez
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6D SOLUTIONS
Original Assignee
6D Solutions
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Filing date
Publication date
Application filed by 6D Solutions filed Critical 6D Solutions
Publication of EP1012395A1 publication Critical patent/EP1012395A1/en
Application granted granted Critical
Publication of EP1012395B1 publication Critical patent/EP1012395B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00Details of pavings
    • E01C11/16Reinforcements
    • E01C11/165Reinforcements particularly for bituminous or rubber- or plastic-bound pavings

Definitions

  • the present invention relates to the technical sector of public works, more precisely that of the construction and maintenance of roads, motorways, roadways, roadways and the like.
  • the roads are coated with a layer of hydrocarbon materials often called “coated”, or “bituminous concrete", this product coming from an oil residue (asphalt).
  • the pavements are in the general case (but not limiting) constituted by the support, in general a “coated”, an emulsion layer above the support, as a bonding layer, a reinforcement of the type of 'invention above, and finally a new layer of asphalt about 4 to about 25 cm thick, in one or more layers separated by a thin layer of bonding emulsion.
  • ROADTEX and "ROTAFLEX” (brands of the company CHOMARAT) are known.
  • ROADTEX type structures consist of an open grid of continuous glass filaments linked by a thermoplastic polymer.
  • ROTAFLEX type structures consist of a polyester nonwoven reinforced with a glass grid.
  • Patent EP 0 368 600 (Netlon Ltd.) describes a two-layer structure comprising:
  • a mesh grid above in particular made of polypropylene, and comprising a thick nodule and not oriented at each junction of strands, and
  • an aqueous bitumen emulsion is deposited on the road, then the two-layer structure, then a new layer of bitumen. It is specified that the polypropylene of the grid undergoes a heat treatment during manufacture, to avoid shrinkage during the thermal shock caused by the deposition temperature of the mix.
  • the laminate is characterized in that the fabric is combined with the plastic mesh only at the thicker junctions of the mesh and not at the strands of the mesh.
  • EP 0 318 707 (Bay Mills Ltd.) is also known, which describes a frame for road surfaces, comprising:
  • this adhesive coating can be activated by heat or pressure and forms a bond between the grid and the asphalt.
  • This adhesive does not, however, bond the two layers of asphalt on both sides of the grid, which may also be suitable for certain road applications.
  • Patent USP 3,581,631 (Enka Corp.) describes an armature which consists of a film comprising threads or filaments, forming meshes which are completely or partially clogged with an adhesive.
  • This adhesive is chosen from certain resins and certain polymers having a softening point greater than 50 ° C. and is cast hot on the film. The adhesive, on the one hand wets and "impregnates" the film, and on the other hand is miscible with the bitumen layer.
  • the first problem is the need to perfectly bond the different layers forming the structure, that is to say the support (often a mix), the reinforcement and, in general, a top layer (often a mix applied hot to the whole).
  • Bitumen emulsions are manufactured in a plant, and consist of liquid or semi-liquid aqueous emulsions applicable by conventional equipment. These emulsions can break as well in 5 minutes as in several hours, depending in particular on the temperature prevailing on the application site. The quality of the bitumen is best adapted to the season and the region, but we cannot produce a different batch for each site temperature.
  • the object of the invention is to limit the rise of bitumen through the mesh of grid-type reinforcements.
  • bitumen With a grid product such as ROADTEX, a conventional emulsion layer (water and bitumen in a weight ratio of approximately 40 - 60%) is deposited at the rate of approximately 500 g emulsion / m 2 , ie approximately 300 g / m 2 of "residual bitumen". With a grid + nonwoven product such as ROTAFLEX 833, a nonwoven at 80 g / m 2 is used . We must then go up to about 500 g / m 2 of residual bitumen, because it is necessary to impregnate the nonwoven.
  • an objective is to be able, despite a complex structure comprising a nonwoven, to reduce the rate of residual bitumen to values of 300 g / m 2 or even 200 g / m 2 , that is to say - say below the usual dosages of the bonding layers. This reduction contributes to the reduction of the bitumen rise.
  • the invention resides in the combined use of a fusible product.
  • the invention accelerates thanks to a basic treatment the speed of breakage or rupture of the bitumen emulsion, which reduces the downtime of the site and the rise of the bitumen (which is viscous) through the grid.
  • the invention applies to any road structure in the broad sense, including areas, runways, airports, etc. comprising at least one hydrocarbon binder, in particular so-called bituminous structures, in particular, but for illustrative purposes only, structures comprising at least minus one layer of asphalt or asphalt.
  • the invention relates to a complex reinforcement for road surfacing of the coated or asphalt type, which comprises:
  • a fusible product being interposed between the nonwoven and the grid so as to only partially cover the surface.
  • the invention therefore provides a three-layer structure where the nonwoven is only partially clogged with the fusible product in order to limit the rise of the bitumen.
  • the fusible product fulfills a second function, that of a bonding layer for the final bitumen layer (hot-coated) which will be applied subsequently to the assembly, which makes it possible to significantly reduce the dosage of the bitumen emulsion.
  • a preferred manufacturing process consists in preparing the fine nonwoven, and in "sprinkling" the fusible on the nonwoven.
  • dust is meant the fact that, by any means of application known to those skilled in the art, the fusible is deposited so as to cover only part of the surface of the nonwoven. The dusting should be as regular as possible, but perfect regularity is not necessary.
  • part of the surface is meant the fact that about 30 to 70% of the surface of the nonwoven is covered.
  • fine nonwoven is meant a nonwoven of the order of 20 to 80, preferably 20 to 50, preferably 20 to 30 g / m 2 .
  • the fusible product will be an EVA (ethylene / vinyl acetate) copolymer.
  • the grid is then deposited on the face of the nonwoven having received the fusible.
  • the complex according to the invention is placed in such a way that the grid forms the lower face and the nonwoven the upper face.
  • the grid / nonwoven assembly traps an air film which will act as a thermal shield against the cold temperature of the lower support, and will therefore optimize the melting of the EVA by the heat provided by the deposition of the upper asphalt layer.
  • the nonwoven will preferably be a fine hydrophobic nonwoven, of the polyester or polypropylene type, or glass nonwoven, in particular at about 20 - 50 g / m 2 , or even up to 80 g / m 2 .
  • the nonwovens of the prior art are used at around 120 g / m 2 .
  • This nonwoven must degrade mechanically by puncturing by the aggregates contained in the mix, due to gravity and compaction (see Fig. 3).
  • the fine nonwoven degrades in the event of an open grid; in the case of a tight grid, the nonwoven will be thicker and will be less degraded, or will not be degraded.
  • open grid is meant a grid with a wide mesh with respect to the granules contained in the upper asphalt layer.
  • the grid will preferably be a grid of glass filaments:
  • the mesh of the products will preferably be 5 x 5 mm;
  • the invention also relates to a method and an armature making it possible to break the bitumen emulsion more quickly.
  • one or more of the elements constituting the complex are brought to a basic pH, that is to say that the grid and / or the nonwoven and / or the fusible is carried, at basic pH.
  • the structure according to the invention will be impregnated, either the grid / nonwoven assembly, or, very preferably, the nonwoven deposited on the grid, with a basic agent.
  • the basic agent will be any agent or mixture of agents capable of giving the structure a basic character sufficient to significantly accelerate the "breakage" of the emulsion, such as for example the soda ash.
  • the emulsion can thus be "broken” almost instantly or instantly. This additional measure saves the site a lot of time during implementation, in particular by not making the teams wait unnecessarily.
  • Any basic agent or any mixture of basic agents capable of, or adapted to, meet the criterion of breakage of the emulsion may be used. Such products will be within the reach of the skilled person.
  • the basic agent On contact with the bitumen layer deposited on the support, the basic agent acts on the emulsion and effectively, simply and practically causes this emulsion to break or break. Without wishing to be bound by any theory, the Applicant considers that the basic agent deactivates the acid sites of the surfactants used to maintain the stability of the emulsion.
  • FIG. 1 schematically shows a sectional view of a representative road structure
  • FIG. 2 schematically shows a sectional view of a road structure comprising the frame according to the invention. This figure is intended to represent the order in which the various elements are positioned. The final structure obtained is shown in Figure 3.
  • FIG. 3 schematically represents in section the final structure obtained when the elements of the invention are available in accordance with FIG. 2.
  • ground base layer consisting of flattened compacted pebbles
  • FIG. 1 describes a conventional road structure when a reinforcement is incorporated.
  • a thin bonding layer (emulsion) 3 is deposited, then a coating layer 4 which forms the "serious bitumen".
  • This layer will receive the wearing course 5 which consists, in its simplest form, of a thin layer of emulsion 6 on which the reinforcement 7 is placed, after which the final coated layer 8 is deposited.
  • One or more layers of asphalt 8 superimposed on the grid are applied, depending on the type of road structure.
  • the the highest asphalt layer is called the wearing course.
  • the asphalt layers are then bonded together by a thin bonding layer of the layer 6 type.
  • the invention also applies to such variants.
  • FIG. 2 represents the order of arrangement of the elements according to the invention.
  • the bonding emulsion 6 is deposited on the serious bitumen 4.
  • This emulsion in accordance with an important advantage of the invention, will preferably be dosed at only 200 - 300 g of residual bitumen per m 2 .
  • the complex 7 according to the invention is then deposited, for example manufactured as described above.
  • This complex consists of the grid 22 and the fine nonwoven 20, the latter carrying on its underside the fusible 21.
  • the coated layer 8 is then deposited (or the first layer if there must be several), which contains pebbles 23.
  • the temperature means that the water of the emulsion 6 can escape.
  • FIG. 3 represents the final state of the road structure, after the sequence shown in FIG. 2. It can be seen that the stones 23 of the asphalt 8 have penetrated between the strands of the grid 22, through the fine nonwoven 20 , and if necessary by tearing it, possibly until it comes into contact with the bonding layer 6 which has itself been at least softened by the heat and therefore has been at least partially integrated into the assembly. It has not been possible in practice to represent the fusible 21 which has melted and has been integrated into the assembly at the level, substantially, of the nonwoven. The whole forms a structure of which all the layers are perfectly integral.
  • the invention also relates to a method of reinforcing road structures, characterized in that it is deposited on the layer bitumen emulsion covering the serious bitumen, a reinforcement as described above, then a coating layer, and also, as a particular variant of implementation, the method of reinforcing road structures described above, characterized in that one or more upper layers of asphalt are deposited, each layer being linked by an intermediate layer of bitumen emulsion.
  • the invention relates in particular, according to a preferred embodiment, the method of reinforcing road structures which consists in unwinding the complex prefabricated reinforcement according to the invention on the emulsion layer covering the serious bitumen.
  • the various elements of the complex framework can also be unrolled separately on the site.
  • the nonwoven may have been previously impregnated with a basic agent, or may contain a basic agent in the mass. It is also possible to incorporate the basic agent into the fusible deposited on the nonwoven.
  • a basic agent can be deposited on the grid or on the nonwoven as and when it is unrolled.
  • the invention also relates to a method for reinforcing road structures, characterized in that at least one layer of asphalt is deposited on the reinforcement, or characterized in that several layers of asphalt are deposited on the reinforcement, each layer being separated by a bonding layer of bitumen emulsion.
  • the invention also relates to a method for reinforcing road structures, characterized in that a 200 to 300 g / m 2 emulsion of residual bitumen is used as the lower bonding layer of bitumen emulsion.
  • the invention also relates to a method of reinforcing road structures according to which a nonwoven is used (possibly alone on certain sites) or any type of a complex frame of the grid type, possibly comprising a nonwoven or a structure.
  • a nonwoven is used (possibly alone on certain sites) or any type of a complex frame of the grid type, possibly comprising a nonwoven or a structure.
  • analogous characterized in that said nonwoven is worn, or one or more of the elements constituting the complex of the type grid at a basic pH capable of accelerating the breakage or rupture of the lower bitumen emulsion.
  • all the applicable variants of the invention may be implemented, in whole or in part, by adapting them to the nonwoven or to the type of complex reinforcement used.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Bridges Or Land Bridges (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

The invention concerns a reinforcement (7) made basic to accelerate bitumen demulsification whereon it is set, and consisting of a fibreglass grid (22), a fine nonwoven (20) on its top surface and an incorporated heat-sealing product (21). Said reinforcement strongly prevents the bitumen from being thrust upwards under the weight of heavy-construction machines It also saves time and bitumen.

Description

ARMATURE DE RENFORCEMENT DE STRUCTURES ROUTIERES, NOTAMMENT EN BITUMEREINFORCING REINFORCEMENT FOR ROAD STRUCTURES, ESPECIALLY IN BITUMEN
La présente invention concerne le secteur technique des travaux publics, plus précisément celui de la construction et de l'entretien de routes, autoroutes, chaussées, voies routières et analogues.The present invention relates to the technical sector of public works, more precisely that of the construction and maintenance of roads, motorways, roadways, roadways and the like.
On sait que les chaussées sont revêtues d'une couche de matériaux hydrocarbonés souvent dénommés " enrobé ", ou " béton bitumineux ", ce produit provenant d'un résidu pétrolier ( asphalte ). Plus précisément, les chaussées sont dans le cas général ( mais non limitatif ) constituées par le support, en général un " enrobé ", une couche d'émulsion au-dessus du support, comme couche d'accrochage, une armature du type de l'invention au-dessus, et enfin une nouvelle couche d'enrobé de environ 4 à environ 25 cm d'épaisseur, en une ou plusieurs couches séparées par une fine couche d'émulsion d'accrochage.We know that the roads are coated with a layer of hydrocarbon materials often called "coated", or "bituminous concrete", this product coming from an oil residue (asphalt). More specifically, the pavements are in the general case (but not limiting) constituted by the support, in general a "coated", an emulsion layer above the support, as a bonding layer, a reinforcement of the type of 'invention above, and finally a new layer of asphalt about 4 to about 25 cm thick, in one or more layers separated by a thin layer of bonding emulsion.
On rappellera qu'un enrobé est un mélange de gravillons et de bitume.Remember that a mix is a mixture of gravel and bitumen.
Il est apparu depuis longtemps qu'il était nécessaire de renforcer de tels revêtements, notamment pour éviter la formation de craquelures ou fissures, dues aux contraintes mécaniques exercées par le trafic routier, ou aux contraintes thermiques.It has long appeared that it is necessary to reinforce such coatings, in particular to avoid the formation of cracks or cracks, due to the mechanical stresses exerted by road traffic, or to thermal stresses.
On a incorporé divers renforts à cette couche de roulement en bitume, comme par exemple des renforts textiles ( FR A 2 592 411 , FR A 2 635 542 ), des nappes de fibre de verre, des structures en grille, ou des armatures complexes associant une grille et une nappe de non tissé.Various reinforcements have been incorporated into this bitumen wearing course, such as textile reinforcements (FR A 2 592 411, FR A 2 635 542), sheets of fiberglass, grid structures, or complex reinforcements associating a grid and a nonwoven tablecloth.
On connaît notamment les produits " ROADTEX " et " ROTAFLEX" (marques de la société CHOMARAT ). Les structures de type ROADTEX sont constituées par une grille ouverte de filaments continus de verre liés par un polymère thermoplastique. Les structures de type ROTAFLEX sont constituées par un non tissé de polyester armé d'une grille de verre.The products "ROADTEX" and "ROTAFLEX" (brands of the company CHOMARAT) are known. ROADTEX type structures consist of an open grid of continuous glass filaments linked by a thermoplastic polymer. ROTAFLEX type structures consist of a polyester nonwoven reinforced with a glass grid.
Le brevet EP 0 368 600 ( Netlon Ltd. ) décrit une structure bicouche comportant :Patent EP 0 368 600 (Netlon Ltd.) describes a two-layer structure comprising:
- une grille à mailles au dessus, notamment en polypropylène, et comportant un nodule épais et non orienté à chaque jonction de brins, eta mesh grid above, in particular made of polypropylene, and comprising a thick nodule and not oriented at each junction of strands, and
un tissu en polyester sous la grille, donc destiné à venir au contact de la couche de bitume déposée sur la chaussée.a polyester fabric under the grid, therefore intended to come into contact with the bitumen layer deposited on the floor.
Selon ce document, on dépose une émulsion aqueuse de bitume sur la chaussée, puis la structure bicouche, puis une nouvelle couche de bitume. Il est précisé que le polypropylène de la grille subit un traitement thermique lors de la fabrication, pour éviter un retrait lors du choc thermique causé par la température de dépôt de l'enrobé.According to this document, an aqueous bitumen emulsion is deposited on the road, then the two-layer structure, then a new layer of bitumen. It is specified that the polypropylene of the grid undergoes a heat treatment during manufacture, to avoid shrinkage during the thermal shock caused by the deposition temperature of the mix.
Une caractéristique importante du brevet Netlon réside dans le fait que le laminé est caractérisé en ce que le tissu est combiné à la maille plastique seulement au niveau des jonctions plus épaisses de la maille et non au niveau des brins de la maille.An important feature of the Netlon patent is that the laminate is characterized in that the fabric is combined with the plastic mesh only at the thicker junctions of the mesh and not at the strands of the mesh.
On connaît encore le brevet EP 0 318 707 ( Bay Mills Ltd.), qui décrit une armature pour revêtements routiers, comprenant :EP 0 318 707 (Bay Mills Ltd.) is also known, which describes a frame for road surfaces, comprising:
- une grille ouverte préimprégnée de résine, à mailles maintenues ouvertes après l'imprégnation ;- an open grid pre-impregnated with resin, with meshs kept open after impregnation;
un enduit adhésif appliqué sur la face inférieure de la grille imprégnée, sans boucher les mailles.an adhesive coating applied to the underside of the impregnated grid, without blocking the meshes.
Il est précisé que cet enduit adhésif peut être activé par la chaleur ou la pression et forme une liaison entre la grille et l'asphalte. Cet adhésif ne réalise cependant pas le collage des deux couches d'asphalte de part et d'autre de la grille, ce qui peut d'ailleurs convenir pour certaines applications routières.It is specified that this adhesive coating can be activated by heat or pressure and forms a bond between the grid and the asphalt. This adhesive does not, however, bond the two layers of asphalt on both sides of the grid, which may also be suitable for certain road applications.
Le brevet USP 3,581 ,631 ( Enka Corp. ) décrit une armature qui consiste en un film comportant des fils ou filaments, formant des mailles qui sont colmatées en totalité ou en partie par un adhésif. Cet adhésif est choisi parmi certaines résines et certains polymères ayant un point de ramollissement supérieur à 50 °C et est coulé à chaud sur le film. L'adhésif, d'une part mouille et "imprègne " le film, et d'autre part est miscible avec la couche de bitume.Patent USP 3,581,631 (Enka Corp.) describes an armature which consists of a film comprising threads or filaments, forming meshes which are completely or partially clogged with an adhesive. This adhesive is chosen from certain resins and certain polymers having a softening point greater than 50 ° C. and is cast hot on the film. The adhesive, on the one hand wets and "impregnates" the film, and on the other hand is miscible with the bitumen layer.
On connaît enfin la combinaison d'un produit ROADTEX et d'une couche de produit thermofusible appliquée sur une de ses faces, qui fond à une température inférieure à celle de la couche de bitume.Finally, the combination of a ROADTEX product and a layer of hot-melt product applied to one of its faces is known, which melts at a temperature below that of the bitumen layer.
Les documents de l'art antérieur ont cherché à optimiser le comportement des structures routières.The documents of the prior art have sought to optimize the behavior of road structures.
Le premier problème posé réside dans la nécessité de coller parfaitement entre elles les différentes couches formant la structure, c'est-à-dire le support ( souvent un enrobé ), l'armature de renfort et, en général, une couche supérieure ( souvent un enrobé appliqué à chaud sur l'ensemble ).The first problem is the need to perfectly bond the different layers forming the structure, that is to say the support (often a mix), the reinforcement and, in general, a top layer (often a mix applied hot to the whole).
II existe un second problème, qui découle du premier. Les émulsions de bitume sont fabriquées en centrale, et consistent en émulsions aqueuses liquides ou semi-liquides applicables par les engins habituels. Ces émulsions peuvent se casser aussi bien en 5 minutes qu'en plusieurs heures, en fonction notamment de la température régnant sur le site d'application. On adapte au mieux en centrale la qualité du bitume à la saison et à la région, mais on ne peut pas produire un lot différent pour chaque température de site. Après le dépôt d'une armature, et tant que l'émulsion n'est pas cassée, ou même après la rupture de l'émulsion si la température du site est trop élevée (bitume trop mou ), les engins de travaux publics ( qui notamment doivent déposer encore une couche d'enrobé ) ne peuvent pas rouler sous peine de voir le bitume coller aux roues et sous peine d'arracher l'armature qui vient d'être posée.There is a second problem, which follows from the first. Bitumen emulsions are manufactured in a plant, and consist of liquid or semi-liquid aqueous emulsions applicable by conventional equipment. These emulsions can break as well in 5 minutes as in several hours, depending in particular on the temperature prevailing on the application site. The quality of the bitumen is best adapted to the season and the region, but we cannot produce a different batch for each site temperature. After the deposition of a reinforcement, and as long as the emulsion is not broken, or even after the emulsion breaks if the site temperature is too high (bitumen too soft), public works machinery (which in particular must still deposit a layer of asphalt) cannot roll under penalty of seeing the bitumen stick to the wheels and under penalty of tearing off the reinforcement which has just been laid.
L'invention a pour objet de limiter la remontée du bitume au travers des mailles des armatures de type grille.The object of the invention is to limit the rise of bitumen through the mesh of grid-type reinforcements.
Par ailleurs, il serait économiquement intéressant de réduire la quantité de bitume à utiliser. Avec un produit en grille comme le ROADTEX, on dépose une couche d'émulsion classique ( eau et bitume dans un rapport en poids d'environ 40 - 60 % ) à raison d'environ 500 g émulsion / m2, soit environ 300 g / m2 de " bitume résiduel ". Avec un produit grille + non tissé comme le ROTAFLEX 833, on utilise un non tissé à 80 g/m2. On doit alors monter à environ 500 g / m2 de bitume résiduel, car il est nécessaire d'imprégner le non tissé. Selon l'invention, un objectif est de pouvoir, malgré une structure complexe comportant un non tissé, diminuer le taux de bitume résiduel jusqu'aux valeurs de 300 g/m2 ou même de 200 g/m2, c'est-à-dire au-dessous des dosages habituels des couches d'accrochage. Cette réduction participe à la réduction de la remontée de bitume.Furthermore, it would be economically advantageous to reduce the amount of bitumen to be used. With a grid product such as ROADTEX, a conventional emulsion layer (water and bitumen in a weight ratio of approximately 40 - 60%) is deposited at the rate of approximately 500 g emulsion / m 2 , ie approximately 300 g / m 2 of "residual bitumen". With a grid + nonwoven product such as ROTAFLEX 833, a nonwoven at 80 g / m 2 is used . We must then go up to about 500 g / m 2 of residual bitumen, because it is necessary to impregnate the nonwoven. According to the invention, an objective is to be able, despite a complex structure comprising a nonwoven, to reduce the rate of residual bitumen to values of 300 g / m 2 or even 200 g / m 2 , that is to say - say below the usual dosages of the bonding layers. This reduction contributes to the reduction of the bitumen rise.
Selon un de ses aspects principaux, l'invention réside dans l'emploi combiné d'un produit thermocollant.According to one of its main aspects, the invention resides in the combined use of a fusible product.
Selon un autre de ses aspects, l'invention accélère grâce à un traitement basique la vitesse de casse ou de rupture de l'émulsion de bitume, ce qui réduit le temps d'immobilisation du chantier et la remontée du bitume ( qui est visqueux) au travers de la grille.According to another of its aspects, the invention accelerates thanks to a basic treatment the speed of breakage or rupture of the bitumen emulsion, which reduces the downtime of the site and the rise of the bitumen (which is viscous) through the grid.
L'invention s'applique à toute structure routière au sens large, y compris aires, pistes, aéroports, etc.. comportant au moins un liant hydrocarboné, notamment les structures dites bitumineuses, notamment, mais à titre représentatif uniquement, les structures comportant au moins une couche d'enrobé ou asphalte. Selon un mode de réalisation particulier, l'invention concerne une armature complexe pour revêtement routier du type enrobé ou asphalte, qui comprend :The invention applies to any road structure in the broad sense, including areas, runways, airports, etc. comprising at least one hydrocarbon binder, in particular so-called bituminous structures, in particular, but for illustrative purposes only, structures comprising at least minus one layer of asphalt or asphalt. According to a particular embodiment, the invention relates to a complex reinforcement for road surfacing of the coated or asphalt type, which comprises:
une grillea grid
- un non tissé fin déposé sur la grille- a fine nonwoven deposited on the grid
un produit thermocollant étant intercalé entre le non tissé et la grille de manière à en recouvrir seulement partiellement la surface.a fusible product being interposed between the nonwoven and the grid so as to only partially cover the surface.
L'invention propose donc une structure tri couche où le non tissé est en partie seulement colmaté par le produit thermocollant afin de limiter la remontée du bitume.The invention therefore provides a three-layer structure where the nonwoven is only partially clogged with the fusible product in order to limit the rise of the bitumen.
Le produit thermocollant remplit une second fonction, celle de couche d'accrochage pour la couche de bitume finale ( enrobé à chaud ) qui sera appliquée ultérieurement sur l'ensemble, ce qui permet de nettement diminuer le dosage de l'émulsion en bitume.The fusible product fulfills a second function, that of a bonding layer for the final bitumen layer (hot-coated) which will be applied subsequently to the assembly, which makes it possible to significantly reduce the dosage of the bitumen emulsion.
Un procédé de fabrication préféré consiste à préparer le non tissé fin, et à " saupoudrer " le thermocollant sur le non tissé. Par "saupoudrage", on désigne le fait que, par un moyen d'application quelconque connu de l'homme de métier, on dépose le thermocollant de manière à ne recouvrir qu'une partie de la surface du non tissé. Le saupoudrage doit être aussi régulier que possible, mais une régularité parfaite n'est pas nécessaire. Par " une partie de la surface " on désigne le fait qu'environ 30 à 70 % de la surface du non tissé sont recouverts. Par non tissé " fin" on désigne un non tissé de l'ordre de 20 à 80, de préférence de 20 à 50, de préférence de 20 à 30 g / m2.A preferred manufacturing process consists in preparing the fine nonwoven, and in "sprinkling" the fusible on the nonwoven. By "dusting" is meant the fact that, by any means of application known to those skilled in the art, the fusible is deposited so as to cover only part of the surface of the nonwoven. The dusting should be as regular as possible, but perfect regularity is not necessary. By "part of the surface" is meant the fact that about 30 to 70% of the surface of the nonwoven is covered. By "fine" nonwoven is meant a nonwoven of the order of 20 to 80, preferably 20 to 50, preferably 20 to 30 g / m 2 .
On peut aussi déposer le thermocollant sous forme de film ajouré, c'est-à-dire pour fermer partiellement les ouvertures ou pores du non tissé. Selon un mode particulier et non limitatif, le produit thermocollant sera un copolymère EVA ( éthylène / acétate de vinyle ).It is also possible to deposit the fusible in the form of a perforated film, that is to say to partially close the openings or pores of the nonwoven. According to a particular and nonlimiting mode, the fusible product will be an EVA (ethylene / vinyl acetate) copolymer.
On dépose ensuite la grille sur la face du non tissé ayant reçu le thermocollant.The grid is then deposited on the face of the nonwoven having received the fusible.
Pour l'application, on dispose le complexe selon l'invention de telle façon que la grille forme la face inférieure et le non tissé la face supérieure.For the application, the complex according to the invention is placed in such a way that the grid forms the lower face and the nonwoven the upper face.
Si l'on utilise l'option consistant à rendre basique ( cf. description ci dessous ) au moins un élément de l'armature complexe, on intercale cette opération dans le procédé ci-dessus, ou bien lors de la fabrication de l'élément. Par exemple, pour imprégner le non tissé par un agent basique, on peut soit réaliser l'imprégnation séparément, soit réaliser l'imprégnation lors de la fabrication du complexe, avant le dépôt du thermocollant, soit même au moment de l'application sur le site.If we use the option of making basic (see description below) at least one element of the complex reinforcement, we interpose this operation in the above process, or during the manufacture of the element . For example, to impregnate the nonwoven with a basic agent, it is possible either to carry out the impregnation separately, or to carry out the impregnation during the manufacture of the complex, before the deposition of the fusible, or even at the time of application to the site.
Lorsque l'on dépose la couche supérieure d'enrobé, à chaudWhen the top layer of asphalt is applied, hot
(environ à 160 °C), l'ensemble grille / non tissé emprisonne un film d'air qui va jouer le rôle d'écran thermique contre la température froide du support inférieur, et va donc optimiser la fusion de l'EVA par la chaleur apportée par le dépôt de la couche d'enrobé supérieure.(approximately at 160 ° C.), the grid / nonwoven assembly traps an air film which will act as a thermal shield against the cold temperature of the lower support, and will therefore optimize the melting of the EVA by the heat provided by the deposition of the upper asphalt layer.
Le non tissé sera de préférence un non tissé fin hydrophobe, du type polyester ou polypropylène, ou non tissé de verre, notamment à environ 20 - 50 g / m2, voire jusqu'à 80 g / m2 . On pourra notamment utiliser un polypropylène à 25 g / m2 lié chimiquement ( "chemical bond"). A titre comparatif, les non tissés de l'art antérieur sont utilisés à environ 120 g / m2.The nonwoven will preferably be a fine hydrophobic nonwoven, of the polyester or polypropylene type, or glass nonwoven, in particular at about 20 - 50 g / m 2 , or even up to 80 g / m 2 . One can in particular use a polypropylene with 25 g / m 2 chemically bonded ("chemical bond"). By way of comparison, the nonwovens of the prior art are used at around 120 g / m 2 .
Ce non tissé doit se dégrader mécaniquement par poinçonnement par les granulats contenus dans l'enrobé, du fait de la gravité et du compactage ( cf. Fig. 3 ). Le non tissé fin se dégrade en cas de grille ouverte ; en cas de grille serrée, le non tissé sera plus épais et sera moins dégradé, ou ne sera pas dégradé. Par "grille ouverte", on désigne une grille à maille large par rapport aux granulés contenus dans la couche supérieure d'enrobé.This nonwoven must degrade mechanically by puncturing by the aggregates contained in the mix, due to gravity and compaction (see Fig. 3). The fine nonwoven degrades in the event of an open grid; in the case of a tight grid, the nonwoven will be thicker and will be less degraded, or will not be degraded. By "open grid" is meant a grid with a wide mesh with respect to the granules contained in the upper asphalt layer.
La grille sera de préférence une grille de filaments de verre :The grid will preferably be a grid of glass filaments:
* ouverte de plus de 70 % en cas de renforcement d'enrobé, * open by more than 70% in the event of asphalt reinforcement,
serrée en cas de renforcement de la membrane bitumineuse à base d'émulsion.tight in case of reinforcement of the bituminous membrane based on emulsion.
La maille des produits sera de préférence de 5 x 5 mm ;The mesh of the products will preferably be 5 x 5 mm;
10 x 1 0 mm ; 30 x 30 mm ; 40 x 26 mm ; 50 x 50 mm. Une maille 40 x 26 sera préférée.10 x 10 mm; 30 x 30 mm; 40 x 26 mm; 50 x 50 mm. A 40 x 26 mesh will be preferred.
L'invention concerne également un procédé et une armature permettant de casser plus rapidement l'émulsion de bitume.The invention also relates to a method and an armature making it possible to break the bitumen emulsion more quickly.
Selon un autre aspect de l'invention, on porte un ou plusieurs des éléments constituant le complexe à un pH basique, c'est-à-dire que l'on porte la grille et / ou le non tissé et / ou le thermocollant, à un pH basique.According to another aspect of the invention, one or more of the elements constituting the complex are brought to a basic pH, that is to say that the grid and / or the nonwoven and / or the fusible is carried, at basic pH.
Pour ce faire, on peut incorporer un agent basique dans la masse de la grille, ou dans la masse du thermocollant, ou dans la masse du non tissé.To do this, one can incorporate a basic agent in the mass of the grid, or in the mass of the fusible, or in the mass of the nonwoven.
De manière préférée, on imprégnera la structure selon l'invention, soit l'ensemble grille / non tissé, soit, de manière tout à fait préférée, le non tissé déposé sur la grille, par un agent basique.Preferably, the structure according to the invention will be impregnated, either the grid / nonwoven assembly, or, very preferably, the nonwoven deposited on the grid, with a basic agent.
L'agent basique sera tout agent ou mélange d'agents capable de conférer à la structure un caractère basique suffisant pour accélérer de manière significative la "casse" de l'émulsion, comme par exemple le carbonate de soude. L'émulsion pourra ainsi être "cassée" presque instantanément ou instantanément. Cette mesure additionnelle permet de faire gagner au chantier beaucoup de temps lors de la mise en oeuvre, notamment en ne faisant pas attendre inutilement les équipes.The basic agent will be any agent or mixture of agents capable of giving the structure a basic character sufficient to significantly accelerate the "breakage" of the emulsion, such as for example the soda ash. The emulsion can thus be "broken" almost instantly or instantly. This additional measure saves the site a lot of time during implementation, in particular by not making the teams wait unnecessarily.
On pourra utiliser tout agent basique ou tout mélange d'agents basiques capables de, ou adaptés pour, répondre au critère de casse de l'émulsion. De tels produits seront à la portée de l'homme de métier.Any basic agent or any mixture of basic agents capable of, or adapted to, meet the criterion of breakage of the emulsion may be used. Such products will be within the reach of the skilled person.
Au contact de la couche de bitume déposée sur le support, l'agent basique agit sur l'émulsion et provoque de manière efficace, simple et pratique, la rupture ou casse de cette émulsion. Sans vouloir être liée par une quelconque théorie, la Demanderesse considère que l'agent basique désactive les sites acides des tensioactifs utilisés pour maintenir la stabilité de l'émulsion.On contact with the bitumen layer deposited on the support, the basic agent acts on the emulsion and effectively, simply and practically causes this emulsion to break or break. Without wishing to be bound by any theory, the Applicant considers that the basic agent deactivates the acid sites of the surfactants used to maintain the stability of the emulsion.
L'invention sera mieux comprise à la lecture de la description qui va suivre, et en se référant aux dessins annexés, sur lesquels :The invention will be better understood on reading the description which follows, and with reference to the appended drawings, in which:
- la Figure 1 représente schématiquement une vue en coupe d'une structure routière représentative ;- Figure 1 schematically shows a sectional view of a representative road structure;
- la figure 2 représente schématiquement une vue en coupe d'une structure routière comportant l'armature selon l'invention. Cette figure est destinée à représenter l'ordre dans lequel les divers éléments se positionnent. La structure finale obtenue est représentée sur la figure 3.- Figure 2 schematically shows a sectional view of a road structure comprising the frame according to the invention. This figure is intended to represent the order in which the various elements are positioned. The final structure obtained is shown in Figure 3.
- la Figure 3 représente schématiquement en coupe la structure finale obtenue lorsque l'on dispose les éléments de l'invention conformément à la figure 2.FIG. 3 schematically represents in section the final structure obtained when the elements of the invention are available in accordance with FIG. 2.
Sur les figures, les références ont les mêmes significations, qui sont les suivantes:In the figures, the references have the same meanings, which are as follows:
sol couche de base formée de cailloux compactés aplanisground base layer consisting of flattened compacted pebbles
émulsion bitumineuse inférieure, fortement dosée en bitume résiduel ( env. 1 kg / m2 )lower bituminous emulsion, highly dosed with residual bitumen (approx. 1 kg / m 2 )
4 " grave bitume " ( enrobé de granulométhe plus importante )4 "serious bitumen" (coated with larger particle size)
5 couche de roulement5 wearing course
6 émulsion de bitume ( 0,5 mm ) ( couche d'accrochage )6 bitumen emulsion (0.5 mm) (bonding layer)
7 renfort, qui peut être soit un non tissé qui renforce la membrane bitumineuse, soit une grille, soit un complexe grille - non tissé, et analogues7 reinforcement, which can be either a nonwoven which reinforces the bituminous membrane, or a grid, or a grid-nonwoven complex, and the like
8 couche d'enrobé ( 6 à 15 cm en une ou plusieurs couches séparées par une fine couche d'accrochage )8 asphalt layer (6 to 15 cm in one or more layers separated by a thin bonding layer)
20 non tissé20 non woven
21 thermocollant21 iron-on
22 grille ( à maille d'ouverture " m " )22 grid (with opening mesh "m")
23 cailloux de l'enrobé23 asphalt stones
La figure 1 décrit une structure routière classique lorsque l'on incorpore un renfort. Sur le sol 1 et une couche de cailloux aplanie 2, on dépose une fine couche d'accrochage ( émulsion ) 3 puis une couche d'enrobé 4 qui forme la " grave bitume ". Cette couche va recevoir la couche de roulement 5 qui se compose, dans sa forme la plus simple, d'une couche fine d'émulsion 6 sur laquelle on dispose le renfort 7, après quoi on dépose la couche d'enrobé 8 finale.FIG. 1 describes a conventional road structure when a reinforcement is incorporated. On the ground 1 and a layer of leveled pebbles 2, a thin bonding layer (emulsion) 3 is deposited, then a coating layer 4 which forms the "serious bitumen". This layer will receive the wearing course 5 which consists, in its simplest form, of a thin layer of emulsion 6 on which the reinforcement 7 is placed, after which the final coated layer 8 is deposited.
Au-dessus de la grille, il est appliqué une ou plusieurs couches d'enrobé 8 superposées, en fonction du type de structure routière. La couche d'enrobé la plus haute est appelé couche de roulement. Les couches d'enrobé sont alors liées entre elles par un fine couche d'accrochage du type couche 6. L'invention s'applique aussi à de telles variantes.One or more layers of asphalt 8 superimposed on the grid are applied, depending on the type of road structure. The the highest asphalt layer is called the wearing course. The asphalt layers are then bonded together by a thin bonding layer of the layer 6 type. The invention also applies to such variants.
La figure 2 représente l'ordre de disposition des éléments selon l'invention. Sur la grave bitume 4, on dépose l'émulsion 6 d'accrochage. Cette émulsion, conformément à un avantage important de l'invention, sera dosée, de préférence, à seulement 200 - 300 g de bitume résiduel par m2. On dépose ensuite le complexe 7 selon l'invention, par exemple fabriqué comme décrit ci-dessus. Ce complexe se compose de la grille 22 et du non tissé fin 20, celui ci portant sur sa face inférieure le thermocollant 21. On dépose ensuite la couche d'enrobé 8 ( ou la première couche s'il doit en exister plusieurs ), laquelle contient des cailloux 23. La température fait que l'eau de l'émulsion 6 peut s'échapper. Ceci sera d'autant plus facile si l'émulsion est cassée rapidement par un agent basique incorporé, comme décrit ci dessus, par exemple dans le non tissé. La chaleur de la couche 8 porte également le thermocollant 21 à son point de fusion. Si ce point est relativement élevé, comme celui de I' EVA par exemple, qui peut présenter un point de fusion d'environ 80°C, le film d'air emprisonné entre la grave bitume et le non tissé va empêcher le thermocollant et la surface inférieure de l'enrobé d'être refroidis par la couche " froide " ( 4, 6 ).FIG. 2 represents the order of arrangement of the elements according to the invention. On the serious bitumen 4, the bonding emulsion 6 is deposited. This emulsion, in accordance with an important advantage of the invention, will preferably be dosed at only 200 - 300 g of residual bitumen per m 2 . The complex 7 according to the invention is then deposited, for example manufactured as described above. This complex consists of the grid 22 and the fine nonwoven 20, the latter carrying on its underside the fusible 21. The coated layer 8 is then deposited (or the first layer if there must be several), which contains pebbles 23. The temperature means that the water of the emulsion 6 can escape. This will be all the easier if the emulsion is broken quickly by a basic agent incorporated, as described above, for example in the nonwoven. The heat of the layer 8 also brings the fusible 21 to its melting point. If this point is relatively high, like that of EVA for example, which can have a melting point of around 80 ° C., the film of air trapped between the serious bitumen and the nonwoven will prevent the fusible and the lower surface of the mix to be cooled by the "cold" layer (4, 6).
La figure 3 représente l'état final de la structure routière, après la séquence montrée sur la figure 2. On voit que les cailloux 23 de l'enrobé 8 ont pénétré entre les brins de la grille 22, au travers du non tissé fin 20, et au besoin en le déchirant, éventuellement jusqu'au contact de la couche d'accrochage 6 qui a elle-même été au moins ramollie par la chaleur et donc s'est au moins partiellement intégrée à l'ensemble. Il n'a pas été possible en pratique de représenter le thermocollant 21 qui a fondu et a été intégré à l'ensemble au niveau, sensiblement, du non tissé. L'ensemble forme une structure dont toutes les couches sont parfaitement solidaires.FIG. 3 represents the final state of the road structure, after the sequence shown in FIG. 2. It can be seen that the stones 23 of the asphalt 8 have penetrated between the strands of the grid 22, through the fine nonwoven 20 , and if necessary by tearing it, possibly until it comes into contact with the bonding layer 6 which has itself been at least softened by the heat and therefore has been at least partially integrated into the assembly. It has not been possible in practice to represent the fusible 21 which has melted and has been integrated into the assembly at the level, substantially, of the nonwoven. The whole forms a structure of which all the layers are perfectly integral.
L'invention concerne également un procédé de renforcement de structures routières caractérisé en ce que l'on dépose sur la couche d'émulsion de bitume recouvrant la grave bitume une armature telle que décrite ci-dessus, puis une couche d'enrobé, et également, à titre de variante particulière de mise en oeuvre, le procédé de renforcement de structures routières décrit ci-dessus caractérisé en ce que l'on dépose encore une ou plusieurs couches supérieures d'enrobé, chaque couche étant liée par une couche intermédiaire d'émulsion de bitume.The invention also relates to a method of reinforcing road structures, characterized in that it is deposited on the layer bitumen emulsion covering the serious bitumen, a reinforcement as described above, then a coating layer, and also, as a particular variant of implementation, the method of reinforcing road structures described above, characterized in that one or more upper layers of asphalt are deposited, each layer being linked by an intermediate layer of bitumen emulsion.
L'invention concerne notamment, selon un mode de réalisation préféré, le procédé de renforcement de structures routières qui consiste à dérouler l'armature complexe préfabriquée selon l'invention sur la couche d'émulsion recouvrant la grave bitume.The invention relates in particular, according to a preferred embodiment, the method of reinforcing road structures which consists in unwinding the complex prefabricated reinforcement according to the invention on the emulsion layer covering the serious bitumen.
On peut également dérouler séparément sur le site les divers éléments de l'armature complexe. On peut notamment dérouler la grille puis le non tissé portant le thermocollant " saupoudré " ou déposé en film ajouré sur sa face inférieure. Le non tissé peut avoir été imprégné au préalable par un agent basique, ou comporter un agent basique dans la masse. On peut aussi incorporer l'agent basique au thermocollant déposé sur le non tissé. Enfin, on peut déposer un agent basique sur la grille ou sur le non tissé au fur et à mesure qu'on la / le déroule.The various elements of the complex framework can also be unrolled separately on the site. One can in particular unroll the grid then the nonwoven carrying the fusible "sprinkled" or deposited in perforated film on its underside. The nonwoven may have been previously impregnated with a basic agent, or may contain a basic agent in the mass. It is also possible to incorporate the basic agent into the fusible deposited on the nonwoven. Finally, a basic agent can be deposited on the grid or on the nonwoven as and when it is unrolled.
L'invention concerne encore un procédé de renforcement de structures routières caractérisé en ce que l'on dépose au moins une couche d'enrobé sur l'armature, ou caractérisé en ce qu'on dépose plusieurs couches d'enrobé sur l'armature, chaque couche étant séparée par une couche d'accrochage d'émulsion de bitume.The invention also relates to a method for reinforcing road structures, characterized in that at least one layer of asphalt is deposited on the reinforcement, or characterized in that several layers of asphalt are deposited on the reinforcement, each layer being separated by a bonding layer of bitumen emulsion.
L'invention concerne encore un procédé de renforcement de structures routières caractérisé en ce qu'on utilise comme couche d'accrochage inférieure d'émulsion de bitume une émulsion à 200 - 300 g / m2 de bitume résiduel.The invention also relates to a method for reinforcing road structures, characterized in that a 200 to 300 g / m 2 emulsion of residual bitumen is used as the lower bonding layer of bitumen emulsion.
De manière générale, l'invention concerne également un procédé de renforcement de structures routières selon lequel on utilise un non tissé (éventuellement seul sur certains chantiers) ou tout type d'une armature complexe du type grille, comportant éventuellement un non tissé ou une structure analogue, caractérisé en ce qu'on porte ledit non tissé, ou un ou plusieurs des éléments constituant le complexe du type grille à un pH basique capable d'accélérer la casse ou rupture de l'émulsion inférieure de bitume. Dans ce procédé général, on pourra mettre en oeuvre toutes les variantes applicables de l'invention, en totalité ou en partie, en les adaptant au non tissé ou au type d'armature complexe utilisé.In general, the invention also relates to a method of reinforcing road structures according to which a nonwoven is used (possibly alone on certain sites) or any type of a complex frame of the grid type, possibly comprising a nonwoven or a structure. analogous, characterized in that said nonwoven is worn, or one or more of the elements constituting the complex of the type grid at a basic pH capable of accelerating the breakage or rupture of the lower bitumen emulsion. In this general process, all the applicable variants of the invention may be implemented, in whole or in part, by adapting them to the nonwoven or to the type of complex reinforcement used.
L'homme de métier saura modifier ou adapter l'invention selon les critères habituels de la profession. Those skilled in the art will be able to modify or adapt the invention according to the usual criteria of the profession.

Claims

REVENDICATIONS
1 - Armature complexe de renfort du type comportant une grille, pour le renforcement de structures routières, caractérisée en ce qu'elle comprend :1 - Complex reinforcement of the type comprising a grid, for the reinforcement of road structures, characterized in that it comprises:
une grillea grid
un non tissé fin déposé sur la grillea fine nonwoven deposited on the grid
un produit thermocollant étant intercalé entre le non tissé et la grille de manière à en recouvrir seulement partiellement la surface.a fusible product being interposed between the nonwoven and the grid so as to only partially cover the surface.
2. - Armature selon la revendication 1 , caractérisée en ce que le non tissé est en partie seulement colmaté par le produit thermocollant.2. - Reinforcement according to claim 1, characterized in that the nonwoven is only partially clogged with the fusible product.
3. - Armature du type grille pour le renforcement de structures routières, selon la revendication 1 ou 2, caractérisée en ce que un ou plusieurs des éléments constituant le complexe sont portés à un pH basique.3. - Reinforcement of the grid type for the reinforcement of road structures, according to claim 1 or 2, characterized in that one or more of the elements constituting the complex are brought to a basic pH.
4. - Armature du type grille pour le renforcement de structures routières, selon la revendication 3, caractérisée en ce que la grille et / ou le non tissé et / ou le thermocollant, sont portés à un pH basique.4. - Reinforcement of the grid type for the reinforcement of road structures, according to claim 3, characterized in that the grid and / or the nonwoven and / or the fusible, are brought to a basic pH.
5. - Armature du type grille pour le renforcement de structures routières, selon la revendication 3 ou 4, caractérisée en ce que on incorpore un agent basique dans la masse de la grille, ou dans la masse du thermocollant, ou dans la masse du non tissé.5. - Reinforcement of the grid type for the reinforcement of road structures, according to claim 3 or 4, characterized in that a basic agent is incorporated in the mass of the grid, or in the mass of the fusible, or in the mass of the no woven.
6. - Armature du type grille pour le renforcement de structures routières, selon l'une quelconque des revendications 3 à 5, caractérisée en ce qu'on imprègne la structure selon l'invention, soit l'ensemble grille / non tissé, soit le non tissé déposé sur la grille, par un agent basique.6. - Reinforcement of the grid type for the reinforcement of road structures, according to any one of claims 3 to 5, characterized in that the structure according to the invention is impregnated, either the grid / nonwoven assembly, or the nonwoven deposited on the grid, by a basic agent.
7. - Armature du type grille pour le renforcement de structures routières, selon l'une quelconque des revendications 3 à 6, caractérisée en ce que l'agent basique sera choisi parmi tout agent ou mélange d'agents capable de conférer à la structure complexe un caractère basique suffisant pour accélérer de manière significative la "casse" de l'émulsion, comme par exemple le carbonate de soude.7. - Reinforcement of the grid type for the reinforcement of road structures, according to any one of claims 3 to 6, characterized in that the basic agent will be chosen from any agent or mixture of agents capable of imparting to the complex structure a basic character sufficient to significantly accelerate the "breakage" of the emulsion, such as for example sodium carbonate.
8. - Armature du type grille pour le renforcement de structures routières, selon l'une quelconque des revendications 1 à 7, caractérisée en ce qu'au moins l'un des composants du complexe, et notamment soit l'ensemble grille / non tissé, soit le non tissé déposé sur la grille, soit la grille, soit le thermocollant, est imprégné par un agent basique.8. - Reinforcement of the grid type for the reinforcement of road structures, according to any one of claims 1 to 7, characterized in that at least one of the components of the complex, and in particular is the grid / nonwoven assembly , either the nonwoven deposited on the grid, or the grid, or the fusible, is impregnated with a basic agent.
9. - Armature du type grille pour le renforcement de structures routières, selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le non tissé est déposé sur la face supérieure de la grille et en ce que le thermocollant est intercalé entre la grille et le non tissé, en "saupoudrage " ou en film ajouré, pour fermer partiellement les mailles du non tissé.9. - Reinforcement of the grid type for the reinforcement of road structures, according to any one of claims 1 to 8, characterized in that the nonwoven is deposited on the upper face of the grid and in that the fusible is interposed between the grid and the nonwoven, in "dusting" or in perforated film, to partially close the mesh of the nonwoven.
10. - Armature du type grille pour le renforcement de structures routières, selon l'une quelconque des revendications 1 à 9, caractérisée en ce que le produit thermocollant est un copolymère EVA ( éthylène / acétate de vinyle ).10. - Reinforcement of the grid type for reinforcing road structures, according to any one of claims 1 to 9, characterized in that the fusible product is an EVA (ethylene / vinyl acetate) copolymer.
1 1 . - Armature du type grille pour le renforcement de structures routières, selon l'une quelconque des revendications 1 à 10, caractérisée en ce que le non tissé est un non tissé fin, du type polyester ou polypropylène, ou non tissé de verre, à environ 20 - 80 g / m2, de préférence 20 - 50 et particulièrement 20 - 30 g / m2, et notamment un polypropylène à 25 g / m2 lié chimiquement ( " chemical bond").1 1. - Reinforcement of the grid type for reinforcing road structures, according to any one of claims 1 to 10, characterized in that the nonwoven is a fine nonwoven, of the polyester or polypropylene type, or glass nonwoven, at approximately 20 - 80 g / m 2 , preferably 20 - 50 and particularly 20 - 30 g / m 2 , and in particular a polypropylene at 25 g / m 2 chemically bonded ("chemical bond").
12. - Armature du type grille pour le renforcement de structures routières, selon l'une quelconque des revendications 1 à 1 1 , caractérisée en ce que la grille est une grille de filaments de verre de maille 5 x 5 mm ; 10 x 10 mm ; 30 x 30 mm ; 40 x 26 mm ; 50 x 50 mm, de préférence 40 x 26 mm.12. - Reinforcement of the grid type for the reinforcement of road structures, according to any one of claims 1 to 1 1, characterized in that the grid is a grid of 5 x 5 mm mesh glass filaments; 10 x 10 mm; 30 x 30 mm; 40 x 26 mm; 50 x 50 mm, preferably 40 x 26 mm.
13. - Procédé de renforcement de structures routières selon lequel on utilise une armature complexe du type grille, caractérisé en ce que l'on dépose sur la couche d'émulsion de bitume recouvrant le béton bitumineux une armature selon l'une quelconque des revendications 1 à 12.13. - A method of reinforcing road structures according to which a complex reinforcement of the grid type is used, characterized in that a reinforcement according to any one of claims 1 is deposited on the bitumen emulsion layer covering the bituminous concrete. at 12.
14. - Procédé de renforcement de structures routières selon la revendication 13, caractérisé en ce que l'on dépose au moins une couche d'enrobé sur l'armature.14. - A method of reinforcing road structures according to claim 13, characterized in that at least one layer of asphalt is deposited on the reinforcement.
15. - Procédé de renforcement de structures routières selon la revendication 13 ou 14, caractérisé en ce qu'on dépose plusieurs couches d'enrobé sur l'armature, chaque couche étant séparée par une couche d'accrochage d'émulsion de bitume.15. - A method of reinforcing road structures according to claim 13 or 14, characterized in that several layers of asphalt are deposited on the reinforcement, each layer being separated by a bonding layer of bitumen emulsion.
16. - Procédé de renforcement de structures routières selon l'une quelconque des revendications 13 à 15, caractérisé en ce qu'on utilise comme couche d'accrochage inférieure d'émulsion de bitume une émulsion à 200 - 300 g / m2 de bitume résiduel.16. - A method of reinforcing road structures according to any one of claims 13 to 15, characterized in that one uses as the lower bonding layer of bitumen emulsion an emulsion with 200 - 300 g / m 2 of bitumen residual.
17. - Procédé de renforcement de structures routières selon l'une quelconque des revendications 13 à 16, caractérisé en ce qu'il consiste à dérouler l'armature complexe préfabriquée selon l'une quelconque des revendications 1 à 12 sur la couche d'émulsion recouvrant le béton bitumineux.17. - A method of reinforcing road structures according to any one of claims 13 to 16, characterized in that it consists in unwinding the complex prefabricated reinforcement according to any one of claims 1 to 12 on the emulsion layer covering bituminous concrete.
18. - Procédé de renforcement de structures routières selon l'une quelconque des revendications 13 à 16, caractérisé en ce qu'il consiste à dérouler séparément sur le site les divers éléments de l'armature complexe l'armature complexe préfabriquée selon l'une quelconque des revendications 1 à 12, sur la couche d'émulsion recouvrant le béton bitumineux. 18. - A method of reinforcing road structures according to any one of claims 13 to 16, characterized in that it consists in unrolling separately on the site the various elements of the complex reinforcement of the prefabricated complex reinforcement according to one any of claims 1 to 12, on the emulsion layer covering the bituminous concrete.
19. - Procédé de renforcement de structures routières selon la revendication 18, caractérisé en ce qu'on déroule la grille puis le non tissé portant le thermocollant " saupoudré " ou déposé en film ajouré sur sa face inférieure, le non tissé ayant ou non été imprégné au préalable par un agent basique, ou pouvant comporter un agent basique dans la masse, ou l'agent basique étant incorporé au thermocollant déposé sur le non tissé, ou l'agent basique étant déposé sur la grille ou sur le non tissé au fur et à mesure qu'on la / le déroule. 19. - A method of reinforcing road structures according to claim 18, characterized in that the grid is unwound and then the nonwoven carrying the fusible "sprinkled" or deposited in perforated film on its underside, the nonwoven having or not been impregnated beforehand with a basic agent, or possibly comprising a basic agent in the mass, or the basic agent being incorporated into the fusible deposited on the nonwoven, or the basic agent being deposited on the grid or on the nonwoven as and as we unroll it.
EP98942757A 1997-08-25 1998-08-20 Grid-type reinforcement for strengthening road structures, in particular made of bitumen Expired - Lifetime EP1012395B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9710735 1997-08-25
FR9710735A FR2767543B1 (en) 1997-08-25 1997-08-25 GRID TYPE REINFORCEMENT FOR REINFORCING ROAD STRUCTURES, ESPECIALLY BITUMEN
PCT/FR1998/001824 WO1999010600A1 (en) 1997-08-25 1998-08-20 Grid-type reinforcement for strengthening road structures, in particular made of bitumen

Publications (2)

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EP1012395A1 true EP1012395A1 (en) 2000-06-28
EP1012395B1 EP1012395B1 (en) 2004-11-03

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EP98942757A Expired - Lifetime EP1012395B1 (en) 1997-08-25 1998-08-20 Grid-type reinforcement for strengthening road structures, in particular made of bitumen
EP98942766A Withdrawn EP1009879A1 (en) 1997-08-25 1998-08-21 Reinforcement for strengthening road structures, in particular made of bitumen

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EP98942766A Withdrawn EP1009879A1 (en) 1997-08-25 1998-08-21 Reinforcement for strengthening road structures, in particular made of bitumen

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EP (2) EP1012395B1 (en)
AT (1) ATE281564T1 (en)
AU (2) AU748483B2 (en)
BR (1) BR9811358A (en)
CA (1) CA2301741A1 (en)
DE (1) DE69827398D1 (en)
FR (1) FR2767543B1 (en)
PL (1) PL339007A1 (en)
WO (2) WO1999010600A1 (en)

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US8043025B2 (en) 2001-02-28 2011-10-25 Owens Corning Intellectual Capital, Llc Mats for use in paved surfaces
PL127009U1 (en) * 2018-02-09 2019-08-12 Zikmund Rakowski Inner layer of asphalt road pavements or surfaces
CN108705653B (en) * 2018-07-24 2021-12-03 辽宁科技大学 Road slab manufacturing equipment and method for manufacturing composite block road slab by using same

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PL339007A1 (en) 2000-12-04
EP1009879A1 (en) 2000-06-21
AU9078098A (en) 1999-03-16
ATE281564T1 (en) 2004-11-15
WO1999010601A1 (en) 1999-03-04
BR9811358A (en) 2000-08-22
FR2767543B1 (en) 1999-11-12
AU748483B2 (en) 2002-06-06
AU9077398A (en) 1999-03-16
CA2301741A1 (en) 1999-03-04
WO1999010600A1 (en) 1999-03-04
DE69827398D1 (en) 2004-12-09
FR2767543A1 (en) 1999-02-26
EP1012395B1 (en) 2004-11-03

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