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
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C7/00—Coherent pavings made in situ
  • E01C7/08—Coherent pavings made in situ made of road-metal and binders
  • E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
  • E01C7/185—Isolating, separating or connecting intermediate layers, e.g. adhesive layers; Transmission of shearing force in horizontal intermediate planes, e.g. by protrusions
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • 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
  • E01C7/187—Repairing bituminous covers, e.g. regeneration of the covering material in situ, application of a new bituminous topping

Definitions

• the subject of the present invention is a method of building a road bituminous complex with high fatigue and impermeability capital.
• pavements always behave better when they are highly impermeable, which on the one hand limits the profound alteration of the support soils affected by water ( and which, as a result, lose their lift) and, on the other hand, limit the frostiness of the roadways affected by the phenomenon known as thaw barriers.
• the present invention provides significant improvements in these two fields by proposing a three-layer bituminous complex with high fatigue and impermeability capital.
• the subject of the invention is therefore a method of constructing a road bituminous complex on a support floor, comprising the production of at least one base or base layer and / or a wearing course, with possible interposition of a bonding layer, characterized in that an enriching layer is applied to the support, before the seat layer, by bonding from the bottom of the seat, comprising at least one layer of aggregates and at least one binder layer dosed at more than 800 g / m2.
• the seat layer The seat layer .
• bitumen gravel which consists of gravel, coated with a bitumen harder than that traditionally used and whose softening point Ball and Ring (standard NFT 66-008 of July 1979) is between 52 and 65 ° C, instead of 50 to 56 ° C.
• this layer is applied over 7 to 25 cm representing more than 80% of the entire thickness of the new pavement.
• the bitumen dosage of the base layer is higher and between 4.5 and 5.5% by weight, instead of 4 to 4.5% in the traditional bitumen , the rest being made up of sand and gravel, each representing at least 30% by weight of the mixture (generally half / half).
• the enrichment layer The enrichment layer .
• this layer The purpose of this layer is to bring up an additional binder, in particular bituminous, inside the first 1 or 2 centimeters of the seat layer.
• This enrichment takes place during the hot application of the serious bitumen of the base which will melt the binder of the lower layer. serving as a sort of "reservoir” because it contains much more binder than is necessary.
• This molten binder will percolate the bottom layer from the top, during the compression under pressure of the bottom layer.
• this remelting of the bitumen from the enrichment layer ensures perfect bonding of the seat to the old pavement and strongly waterproofs it.
• This enrichment layer consists of a reservoir coating which can be produced in the following manner.
• bituminous binder either hot melted, or in the form of bitumen emulsion
• a fine layer of protective gravel with a granularity of 4/6 or 6/10 (mm).
• a second identical coating is produced by spreading a layer of binder and then a layer of gravel.
• a coating is thus obtained with a double sealing layer: 2 layers of binder interposed with two layers of gravel.
• the binder is voluntarily overdosed to produce a layer which would quickly exhibit an abundant "bleeding" of bitumen under traffic if this coating were subjected to direct traffic from vehicles. But it is this bleeding, voluntarily amplified in quantity and amplified in speed of exudation (since the serious bitumen which will overcome it will be applied hot around 150 ° C), which is precisely re-sought according to the invention to serve enrichment of the severe bitumen and provide it with additional fatigue resistance. In addition, this bitumen waterproofing layer (in particular the two-layer variant) is even safer once it has been completely remelted.
• the total quantity spread must be greater than 800 g / m2, that is to say that the excess of binder compared to a conventional coating is at least 300 g / m2, and preferably between 1.2 kg / m2 and 3 kg / m2.
• the thickness of the seat layer is greater, its flatness is less good and it is necessary to use a slightly thicker surface layer, this to have more chances of obtaining the desired final uniform.
• a coating of the prior art can be applied over a thickness of 2 to 4 cm, which does not require original composition. If the total thickness of the complex is less than 10 cm, it is also possible, according to a variant, that the seat layer itself also fulfills the function of wearing course, provided that the gravel particle size is less than 14 mm.
• a wearing course is carried out independently of the seat, it is necessary to interpose a bonding layer, consisting of a bituminous binder and dosed at 250 g / m2 or more, in order to improve the bonding of the wearing course and the waterproofing of the seat.
• a bonding layer consisting of a bituminous binder and dosed at 250 g / m2 or more, in order to improve the bonding of the wearing course and the waterproofing of the seat.
• at least 400 g / m2 of binder is used in order to reinforce the overall waterproofing of the complex.
• the process according to the invention can be used not only for the repair of old pavements, in particular for medium traffic, but also for the construction of new pavements or mixed pavements, in particular on a foundation made of fine materials such as fly ash, sand. polluted and other poor quality materials such as chalk, possibly treated, which was practically impossible until now. It is also applicable to the coating of engineering structures.
• An enrichment layer is produced on the old pavement serving as a support by spreading twice a liter / m2 of bitumen emulsion modified with latex (NEOFLEX R from the company SCREG), with 68% residual binder with interposition of two layers of gravel 4/6 mm. There is therefore a first sealing layer at 680 g / m2 graveled in 4/6 and a second layer at 680 g / m2 graveled in 4/6, ie a total of 1.36 kg of binder per m2. The thickness of this layer is approximately 1 cm after compaction.
• This dual-layer procedure provides a better guarantee of waterproofing.
• the coating by spreading a single very thick layer of binder, the latter being produced in the middle of two layers of gravel, what is called the sandwich coating.
• bitumen A 12 cm layer of 0/20 mm serious bitumen is produced, "optimized” with 5% bitumen (softening point 57 ° C) and applied hot to the layer obtained under a) serving as a "reservoir layer", which by fusion during compaction enriches the lower part of this base layer to make it richer in bitumen, therefore more enduring.
• a EURODUIT R surface layer is produced (according to French patent 89 09 893) and consisting of spreading 1 l of latex modified bitumen emulsion, at 62% concentration of binder (as a bonding coating) followed by spreading 27 kg of gravel 6/10 praline with 5% bitumen (thickness 12 mm).
• the total thickness of this system is approximately 18 cm.
• the water or air permeability is practically zero or very low, since there are two non-porous barriers to cross, including a double seal at the bottom of the seat layer.
• bitumen content is 4% in the base and it is constant from top to bottom of the layer. At the support / seat interface and due to the attachment veil, the bitumen content is punctually very slightly increased.
• the base is highly enriched at the bottom of the layer between approximately 10% of bitumen, the value of the "reservoir” coating and 5% which is its own bitumen content.
• This bituminous grade base layer considerably improves the fatigue resistance of the coating, precisely where the effects of fatigue are most felt as a result of the bending of the layer under rolling loads. ;
• the weakest point of the structure from the fatigue point of view is the bottom of the seat. This is where the bending forces are highest and this is where the material is weakest (it is less compact than elsewhere and is not richer in bitumen than elsewhere).
• the weakest point of the structure from the fatigue point of view becomes the top of the enriched zone. This is where the seat is the least compact and this is where it is the least rich in binder.
• the enriched base layer and the "tank" coating become very resistant to fatigue because they are more and more rich in binder and also more and more compact.
• Example 2a the nailing operation described in Example 2a is not necessary, although it remains advisable. All the layers of the complex are produced in the same way as in Example 2.
• the old coating is removed and the surfaces are cleaned (dust removal).
• the enrichment coating is produced as described in Example 1a.
• This base layer is a 0/14 mix coated with 5.4% bitumen and has an average thickness of 7 cm (4 to 10 cm depending on the location since it is mainly used for reprofiling).
• the surface layer is then applied as in Example 1c but without spreading the binder layer which already exists.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Road Paving Structures (AREA)
• Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=9388589

Family Applications (1)

Country Status (3)

Cited By (4)

Citations (2)

• 1989
  • 1989-12-15 FR FR8916662A patent/FR2656013B1/fr not_active Expired - Fee Related
• 1990
  • 1990-12-10 ES ES90403515T patent/ES2040579T3/es not_active Expired - Lifetime
  • 1990-12-10 EP EP19900403515 patent/EP0433155B1/de not_active Expired - Lifetime

Patent Citations (2)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events