Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
  • E01D19/00—Structural or constructional details of bridges
  • E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
  • E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings

Definitions

• the present invention relates to a waterproofing structure for a road structure and a method for waterproofing a road structure apron.
• a disadvantage of this type of waterproofing complex is that, during the laying of the first hot mix carpet (constituting the wearing course) on the bituminous intermediate layer, even sanded, it melts and percolates from bottom to top at the base of this mat, so that its thickness decreases sharply until almost completely disappears if the temperature of the mix is excessive.
• the ability to avoiding the propagation of ascending or descending cracks is then considerably lessened, because an asphalt mat, even highly enriched with bituminous binder at its base, is obviously less deformable than a layer of pure binder.
• the present invention aims to remedy this drawback and to improve the tightness of the complex of patent 87 05435, which is particularly useful for engineering structures subjected to significant thermal stresses, in particular for engineering structures in high mountains. .
• the upper layer of cold-cast mix consists of an emulsion bituminous binder and an aggregate, the maximum particle size of which remains less than approximately 10 mm.
• the cold-cast mix of the upper layer contains from about 6 to about 20 parts of residual binder.
• the aggregate of the upper layer of cold-cast mix is preferably crushed sand.
• the upper layer of cold-poured asphalt constitutes a heat shield preventing any rise in the bituminous binder of the intermediate layer, in the first hot asphalt mat applied to the complex.
• the upper layer of cold-poured asphalt can be in the form of a single-layer, or a two-layer.
• the aggregate is preferably a continuous crushed 0/6 or 0/10.
• a discontinuous sand 0/4 or 0/6, or a discontinuous sand 0/6 When the top layer of cold poured asphalt forms the wearing course, preferably a discontinuous particle size 0/6 or 0/10, or a continuous particle size 0/10.
• the thickness of the cold-cast mix layer is advantageously between 3 and 12 mm. It is essentially a function of the grain size of the sand. Thus, for a 0/2 sand, the thickness is of the order of 3 to 5 mm; for 0/4 sand, it is 5 to 7 mm; for 0/6 sand, it is 7 to 10 mm.
• a filler can optionally complete the granulometry of the aggregates such as for example a ground rock powder, preferably limestone, cement, natural or artificial rock fibers, or even organic fibers.
• the filler content is less than 10% by weight relative to the aggregate.
• the bituminous binder of the upper layer of cold-cast mix contains essentially a bitumen.
• the bitumen can be chosen from pure bitumens, preferably from bitumens of grades 60/70 and 80/100.
• the bitumen used can also be a bitumen modified by the addition of thermoplastic copolymers, either by direct hot mixing of pure bitumen and of copolymers, or by indirect cold mixing of pure bitumen emulsion and of aqueous dispersion of copolymers at the time of manufacture of the asphalt to be poured.
• thermoplastic copolymers ethylene vinyl acetate (EVA) or styrene butadiene styrene styrene (SBS) or ethylene methacrylate (EMA) copolymers will be used.
• EVA ethylene vinyl acetate
• SBS styrene butadiene styrene styrene
• EMA ethylene methacrylate copolymers
• SBR styrene butadiene rubber block copolymers
• acrylic copolymers as well as various mixtures of these copolymers.
• the copolymer content is at most equal to about 5% by weight.
• the addition of such copolymers has the effect of a less rejection on commissioning, a better binder-aggregate bond, increased brine resistance, a reduction in sensitivity to heat and cold, greater cohesion as well as '' better deformability.
• the bituminous binder of the upper layer of cold-cast mix also contains synthetic fibers.
• the fibers used are ultra-fine synthetic fibers (a few decitex) and relatively long (4 to 8 mm). They are chosen according to the elastic modulus of the material of which they are made, in order to obtain a fibrous mix whose deformability is compatible with that of the support on which it will be applied.
• Low modulus fibers will be used for the most deformable structures.
• the proportion of fibers is advantageously between 0.05 and 3% by weight. This proportion may be very low, but given the extreme fineness of these fibers, their number per square meter of asphalt poured is considerable, as well as the length of the network that they constitute.
• the addition of fibers to the bituminous binder is particularly desirable when this binder contains an aggregate whose particle size is discontinuous.
• the aggregate of the lower layer of hot mix can consist, for example, of a mixture of crushed or ground sand of grain size 0-2, rolled sand of grain size 0-2 to 0-4, and crushed sand of grain size 2 -4. You can use a mortar with grain size 0-2 or a micro-gravel with grain size 0-6.
• the bituminous binder used for the lower layer of hot mix can be chosen from the bituminous binders described above for the upper layer of cold poured mix. Preferably about 8 to about 11 parts by weight of binder are used, per 100 parts by weight of aggregate.
• the thickness of the lower layer of hot mix will preferably be between approximately 2 and approximately 4 cm. This first layer allows the reprofiling of the structure to be covered and ensures a first seal.
• a mortar of the type described above has a compactness of 96 to 98%. Permeability tests were carried out using an EDF permeameter. The coefficient is less than 10 ⁇ 12 meters / second. This layer is therefore waterproof.
• the bituminous binder of the intermediate layer essentially contains a bitumen.
• the bitumen can be chosen from pure bitumens, preferably from hard grade bitumens, by example of grade 40/50 or 20/30 or 10/20.
• the bitumen may advantageously be a bitumen modified by the addition of a macromolecular compound, for example an ethylene-vinyl acetate copolymer (EVA) or a styrene-butadiene-styrene copolymer (SBS).
• EVA ethylene-vinyl acetate copolymer
• SBS styrene-butadiene-styrene copolymer
• SBR styrene butadiene rubber block copolymers
• acrylic copolymers as well as various mixtures of these copolymers.
• the maximum content of copolymer is imposed by the limiting viscosity of the modified bitumen to which it flows by a heating and heat-insulated spreading ramp while remaining at a temperature below the degradation temperature of the copolymer.
• the bituminous binder of the intermediate layer of the complex can also comprise a resin in proportions ranging from approximately 1 to approximately 10% by weight. Particularly preferred resins are terpene resins.
• the thickness of the bituminous membrane is advantageously between 1 and 5 mm, which corresponds approximately to 1 to 5 kg / m2 of binder.
• the bituminous membrane can advantageously be coated, in a conventional manner, during a sanding operation, with fine particles, for example with ardoisine or with sandstone.
• elastomers make it possible to give the complex better cohesion, better elasticity and good adhesiveness to the support.
• the fact of using the same elastomers in at least two layers out of three makes it possible to limit the number of raw materials and in this way to facilitate the execution of the complex.
• Composition for the upper layer of cold-cast mix is Composition for the upper layer of cold-cast mix.
• Mobilplast® sold by the applicant containing 95% by weight of emulsifiable 80/100 bitumen, and 5% by weight of an EVA copolymer, was used as bituminous binder.
• An emulsion was prepared having the following composition, expressed in kg:
• composition intended to form the cold-pouring coating layer was prepared by kneading the following mixture, in which the proportions are expressed in parts by weight:
• Composition for the upper layer of cold-cast mix is Composition for the upper layer of cold-cast mix.
• Example 1 The emulsion prepared in Example 1 was used and the following composition was prepared, in the same manner as in Example 1:
• Mobilplast® sold by the applicant containing 97% by weight of 80/100 emulsifiable bitumen, and 3% by weight of an EVA copolymer, was used as bituminous binder.
• An emulsion was prepared having the following composition, expressed in kg:
• the composition intended to form the layer of cold-cast mix was prepared by kneading the following mixture, in which the proportions are expressed in parts by weight:
• composition for the lower layer of hot mix Composition for the lower layer of hot mix
• composition for the lower layer of hot mix Composition for the lower layer of hot mix
• composition intended to form the lower layer of hot mix was prepared by kneading the following mixture, in which the proportions are expressed in parts by weight:

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Road Paving Structures (AREA)
• Sealing Material Composition (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Bridges Or Land Bridges (AREA)
• Tyre Moulding (AREA)
• Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
• Steroid Compounds (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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Citations (4)

Family Cites Families (1)

• 1990
  • 1990-05-14 FR FR909005988A patent/FR2661928B2/fr not_active Expired - Lifetime
• 1991
  • 1991-05-10 US US07/698,303 patent/US5122009A/en not_active Expired - Lifetime
  • 1991-05-14 DK DK91401238.0T patent/DK0457667T3/da active
  • 1991-05-14 DE DE69116220T patent/DE69116220D1/de not_active Expired - Lifetime
  • 1991-05-14 PT PT97668A patent/PT97668B/pt not_active IP Right Cessation
  • 1991-05-14 ES ES91401238T patent/ES2083539T3/es not_active Expired - Lifetime
  • 1991-05-14 AT AT91401238T patent/ATE132928T1/de not_active IP Right Cessation
  • 1991-05-14 EP EP91401238A patent/EP0457667B1/de not_active Expired - Lifetime
• 1996
  • 1996-04-02 GR GR960400876T patent/GR3019488T3/el unknown

Patent Citations (4)

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