EP0481067B1 - Tragschicht im strassenbau - Google Patents

Tragschicht im strassenbau Download PDF

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Publication number
EP0481067B1
EP0481067B1 EP91910124A EP91910124A EP0481067B1 EP 0481067 B1 EP0481067 B1 EP 0481067B1 EP 91910124 A EP91910124 A EP 91910124A EP 91910124 A EP91910124 A EP 91910124A EP 0481067 B1 EP0481067 B1 EP 0481067B1
Authority
EP
European Patent Office
Prior art keywords
sand
form layer
fibres
grain size
layer according
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.)
Expired - Lifetime
Application number
EP91910124A
Other languages
English (en)
French (fr)
Other versions
EP0481067A1 (de
Inventor
Jean-Yves Buffard
Philippe Chapuis
Alain 9 Rue Des Alouettes Sainton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AFFRATEX
Beugnet Dite Ste
Scetauroute
Original Assignee
AFFRATEX
Beugnet Dite Ste
Scetauroute
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Filing date
Publication date
Application filed by AFFRATEX, Beugnet Dite Ste, Scetauroute filed Critical AFFRATEX
Publication of EP0481067A1 publication Critical patent/EP0481067A1/de
Application granted granted Critical
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
    • 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
    • E01C3/00—Foundations for pavings
    • E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration

Definitions

  • the present invention relates to a pavement form layer.
  • the first phase of the construction of a pavement corresponds to earthworks, carried out using special machines which consist of stripping certain parts in relief and recovering spoil which is used to fill the holes (embankments). This gives a base surface often called “leveling ground” relatively flat and made of coarse materials.
  • This surface in addition to its coarse character, often has the drawback of not having sufficient lift to allow the circulation of the construction machinery necessary for the subsequent construction of the road layers.
  • the form layer This responds to a wide variety of purposes: adjustment, frost protection, site traffic, protection of the basement against inclement weather, anti-contamination and homogenization of the bearing capacity of the road, etc.
  • the characteristics (choice of materials, thickness) of this form layer depend essentially on the nature of the soil in place or the leveling ground, but also on other parameters such as the traffic that can be expected on the site, the time interval between the implementation of the subgrade and the implementation of the pavement, or the climatic conditions of the period of the year during which the site takes place.
  • this form layer can be manufactured from a supply of local materials or brought to the site which may or may not undergo a particular treatment, for example using hydraulic binders; these materials can be made up of natural aggregates or by industry by-products or synthetic materials. It also happens that the form layer is simply constituted by the upper part of the leveling ground previously treated over a given height with various materials such as lime, cement ...
  • crushed materials the granularity of which is defined by the range d / D (between d and D, according to Standard NF-P-18 101) for the manufacture of form layers.
  • the object of the present invention is to remedy these drawbacks by proposing a form layer comprising sand of the aforementioned type, but having satisfactory characteristics, in particular from the point of view of lift, and which can be manufactured at low cost without causing particular nuisance for the network surrounding.
  • This pavement form layer is made of granular materials, preferably local or extracted in the immediate vicinity of the site, reinforced with synthetic fibers having a length of the order of 15 to 100 mm so as to improve its bearing capacity and the mechanical properties.
  • the synthetic fibers used in accordance with the invention can have very varied origins.
  • transformation natural polymers viscose, acetate, etc.
  • synthetic polymers polymers
  • mineral fibers glass, carbon, etc.
  • metallic fibers even metallic fibers.
  • acrylic fibers and in particular polyacrylonitrile fibers.
  • the material corresponding to FIG. 1 intrinsically has an immediate index bearing IPI (measured in accordance with the specifications of the Central Laboratory of Bridges and Roads) equal to 22. If one adds to this material 1 per thousand by weight polyacrylonitrile fibers with a diameter equal to 38 microns, we manage to raise this index respectively to 32 if the fibers have a length equal to 30 mm and to 37 if the fibers have a length equal to 50 mm, which, in both cases, corresponds to satisfactory values [Guidelines for the Realization of the Seats of sand pavements treated with hydraulic binders (LCPC - SETRA. February 1985) - supplement to the Directive for the realization of foundations of gravel pavements treated with hydraulic binders (LCPC - SETRA - 1983) Annex 2, page 33].
  • IPI immediate index bearing
  • the addition to the fine sand / synthetic fibers mixture of 15 to 30% by weight of a relatively coarse corrective sand, makes it possible at the start to have a more homogeneous mixture, to increase the density of the layer of shape and improve her outfit.
  • This corrective sand can in particular be constituted by a crushing sand rich in fines and in coarse elements of particle size 0/4, the particle size curve of which is shown in FIG. 2.
  • PROCTOR the operating mode of which was developed by the Central Laboratory of Bridges and Roads. This test is based on the fact that, when samples of the same soil are compacted identically to different water contents, it is found that the density apparent dry soil (dry density) varies and goes through a maximum which is obtained for a well determined water content called optimal water content.
  • the purpose of the PROCTOR test is to determine, for a standardized compaction of given intensity, the optimal water content and the maximum dry density.
  • the fibers are incorporated in the sand / addition sand mixture at the level of the mixing plant, which means that the aggregate is pre-dosed before adding fibers and water. It may also be possible to incorporate them directly on site with a dosing system installed on a treatment machine in place.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Soil Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Agronomy & Crop Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Road Paving Structures (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Claims (5)

  1. Straßen-Formschicht aus granulatförmigem Material, das sich vorzugsweise an Ort und Stelle befindet oder in der unmittelbaren Nähe der Baustelle entnommen ist, verstärkt durch synthetische Fasern von einer Länge von der Größenordnung von 15 - 100 mm zum Verbessern der Tragfähigkeit und der mechanischen Eigenschaften, dadurch gekennzeichnet, daß das granulatförmige Material Feinsand, insbesondere Baggersand, enthält, von einer Körnigkeit definiert durch den Bereich d/D, wobei d den Partikeln kleinsten Durchmessers und D den Partikeln größten Durchmessers entspricht, wobei dieser Sand den Bedingungen d = 0 und 0,1 ≦ D ≦ 25 mm entspricht, und wobei einerseits 15 bis 35 Gewichtsprozent eines relativ groben Sandes zugefügt sind, die dazu dienen, um die Körnigkeit des feinen Sandes zu korrigieren, und andererseits synthetische Fasern in einem Gewichtsanteil von zwischen 0,2 und 5 ‰, vorzugsweise zwischen 0,5 und 1 ‰, wobei die Fasern einen Durchmesser in der Größenordnung von 30 bis 100 Mikron aufweisen.
  2. Straßen-Formschicht nach Anspruch 1, dadurch gekennzeichnet, daß der relativ grobe Sand ein Split, insbesondere aus Kalk, ist mit einer Körnigkeit d/D entsprechend den Bedingungen d = 0 und 3,5 mm ≦ D ≦ 6 mm.
  3. Straßen-Formschicht nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der relativ grobe Sand etwa 15 bis 30 % feine Partikel mit einer Körnigkeit von unter 80 Mikron enthält.
  4. Straßen-Formschicht nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die synthetischen Fasern Acrylfasern sind.
  5. Straßen-Formschicht nach Anspruch 4, dadurch gekennzeichnet, daß die synthetischen Fasern Polyacrylnitrilfasern sind.
EP91910124A 1990-05-03 1991-04-30 Tragschicht im strassenbau Expired - Lifetime EP0481067B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9005564A FR2661699B1 (fr) 1990-05-03 1990-05-03 Procede pour la realisation de couches de forme de chaussee.
FR9005564 1990-05-03
PCT/FR1991/000359 WO1991017311A1 (fr) 1990-05-03 1991-04-30 Procede pour la realisation de couches de forme de chaussee

Publications (2)

Publication Number Publication Date
EP0481067A1 EP0481067A1 (de) 1992-04-22
EP0481067B1 true EP0481067B1 (de) 1995-01-11

Family

ID=9396279

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91910124A Expired - Lifetime EP0481067B1 (de) 1990-05-03 1991-04-30 Tragschicht im strassenbau

Country Status (6)

Country Link
EP (1) EP0481067B1 (de)
AT (1) ATE117033T1 (de)
DE (1) DE69106655D1 (de)
ES (1) ES2069891T3 (de)
FR (1) FR2661699B1 (de)
WO (1) WO1991017311A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2705977B3 (fr) * 1993-06-02 1995-07-21 Orgel Sa Matériau granuleux pour renforcement de sols et son procédé d'élaboration.
FR2706921A1 (en) * 1993-06-22 1994-12-30 Orgel Granular material for road subgrade improvement layers and implementation method
FR2705978B1 (fr) * 1993-06-02 1997-05-23 Orgel Sa Matériau pulvérulent pour couches de forme de chaussées et procédé d'élaboration.
FR2707093B1 (fr) * 1993-06-30 1995-09-29 Genser Franck Surface artificielle notamment adaptée à la réalisation de pistes hippiques ainsi que procédé d'obtention d'une telle surface.
FR2710633B1 (fr) * 1993-09-27 1996-05-03 Bocahut Ets Composition destinée à la réalisation de couches constitutives de chaussées.
FR2724952B1 (fr) * 1994-09-27 1996-12-20 Orgel Procede de renforcement de sols, de couches de terrain ou de chaussees par des fils de verre
FR2727698B1 (fr) * 1994-12-02 1997-01-10 Orgel Procede d'elaboration de sols renforces par des additifs fibreux
FR2729686A1 (fr) * 1995-01-19 1996-07-26 Orgel Sol renforce par des elements fibreux

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6806970A (de) * 1968-05-17 1969-06-25
MA18781A1 (fr) * 1979-03-23 1980-10-01 France Etat Ponts Chaussees Materiau de construction,son application pour remblai,revetement ou massif de fondation sur un sol meuble,et procede et installation de fabrication de ce materiau
NL8303018A (nl) * 1983-08-30 1985-03-18 Heijmans Wegenbouwmij Werkwijze voor het aanbrengen van een onderbouwconstructie voor een kunstgrasveld en kunstgrasveld aangebracht op een dergelijke onderbouwconstructie.
US4790691A (en) * 1986-10-03 1988-12-13 Freed W Wayne Fiber reinforced soil and method

Also Published As

Publication number Publication date
EP0481067A1 (de) 1992-04-22
DE69106655D1 (de) 1995-02-23
FR2661699B1 (fr) 1992-08-28
WO1991017311A1 (fr) 1991-11-14
ES2069891T3 (es) 1995-05-16
ATE117033T1 (de) 1995-01-15
FR2661699A1 (fr) 1991-11-08

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