Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
  • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
  • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
  • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
  • E01C19/1068—Supplying or proportioning the ingredients

Definitions

• the invention relates to a process for preparing a mix. bituminous for road application in which one thins by heating a solid bituminous binder at temperature ambient and mixed with solid fragments so to coat these with bitumen.
• the coated materials thus obtained are mainly used in basecoat, foundation or wearing course when road construction.
• asphalt storable obtained according to one of the two preceding processes, and which generally use more or less quantities significant fluxes of carbochemical origin (derived from coal), petrochemical (petroleum derivatives) or vegetable (derived from vegetable oils).
• the humidity of the aggregates must be regulated by a water supply depending on the state initial of these.
• the object of the invention is to remedy the above drawbacks.
• the invention relates in particular to a method of the kind defined in introduction, and provides that said solid fragments are at room temperature when brought into contact with the binder, and that the bituminous binder contains at least one fluxing.
• the use of cold aggregates dispenses with the use a hot mix station.
• Use of a binder heated avoids the drawbacks associated with emulsions.
• the binder can be taken directly from a truck, without require local heating.
• the surface condition of the cold aggregates does not allow a sufficient adhesion of the binder, they can be treated beforehand by an adhesion promoter.
• a surfactant allows in particular to move the film of water present on the surface in facilitating its later evacuation. Besides, it leads to hydrophobation which promotes the wetting of materials by bitumen during coating.
• silica-limestone aggregates The following formula of silica-limestone aggregates is used: particle size 4/6 75% particle size 2/4 25%.
• a batch of these aggregates is treated at room temperature, without heating or drying, with an emulsion having the following composition: H 2 O 50% Oleoflux 18 30 % Emulsamine L 60 20%.
• Oleoflux 18 and Emulsamine L 60 are respectively an ester sunflower methyl (obtained by transesterification of sunflower oil) sold by the OLÉOROUTE Company and a diamine marketed by CECA, and constitute together the adhesion promoter, Emulsamine L 60 also playing the role of emulsifier.
• the batch thus treated and one batch not treated are coated with 5.8% of a mixture of bitumen and methyl ester sunflower as a flux, the latter constituting 18% of the mixed.
• the temperature of the binder for coating is 160 ° C. Without the adhesion promoter, the coating is not satisfactory.
• the use of the promoter at a content of approximately 0.5% in the coating allows a much better coating, the possible uncoated dots quickly becoming so by contact.
• the product stability has been verified over a month by a test empirical process of separating aggregates using a spatula immersed in the mix, after 2 to 3 minutes of brewing.
• mixes prepared in the above examples particularly suitable as storable mixes, the invention is not limited to such coated materials. She is equally applicable for the realization of asphalt intended for construction and maintenance work of roads.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Road Paving Structures (AREA)
• Paints Or Removers (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8871033

Family Applications (1)

Country Status (2)

Cited By (3)

Citations (6)

• 2001
  • 2001-12-27 FR FR0116943A patent/FR2834305B1/fr not_active Expired - Lifetime
• 2002
  • 2002-12-20 EP EP02293205A patent/EP1323867A1/de not_active Withdrawn

Patent Citations (6)

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