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 present invention relates to a method of preparing an emulsion- or asphalt-concrete for use as a road material.
• a noticeably harder bitumen i.e. a bitumen of higher viscosity
• the invention is based on the consideration that the material as a whole will be supple and shapeable as long as the fine stone fraction has not been bonded by a high viscid bitumen, whether or not the stones in the coarse fraction have already been wrapped by a more or less broken emulsion based on a high viscid bitumen.
• the finally admixed emulsion will make the entire mixture supple and formable, i.e. the mixture can be laid out evenly and with ordinary equipment, although the stones of the coarse fraction have already been coated with a layer of broken, hard bonding bitumen. Because both types of emulsion are adaptable to a total or extensive breaking already before the mixture leaves the mixing plant, problems with respect to flow off during transportation to the working area will be avoided, and the laid out layer will be insensitive to rain right from the beginning.
• the principle of the invention may be advantageously used also for the production of an asphalt material in which the binding agent is bitumen in non-emulgated condition.
• the coarse stone fraction is heated to such a high temperature, by which the stones can be totally coated by the initially added high viscid bitumen, which, itself; is heated to assume a viscosity suitably low for this purpose.
• the fine fraction is added to the mixer, in either cold or warm condition all according to the applied low viscid bitumen, which is also added; this bitumen should have a temperature high enough to condition such a low viscosity that the bitumen can effectively coat the stone particles of the fine fraction.
• This temperature should be somewhat lower than the temperature of the coarse fraction, such that the coating of the coarse stones by the high viscid bitumen will be stabilized.
• the 'soft' emulsion or the low viscid bitumen in connection with the fine stone fraction it is possible to achieve a homogenous admixture into the fine fraction, also here without any extensive heating as far as the hot method is concerned.
• the viscosity of the relevant bitumen should normally be somewhat lower that 3000 mm 2 /sec, but under special circumstances this figure may be higher, up to 4-5000, though still noticeably smaller than the viscosity figure of the applied high viscid bitumen.
• the weight ratio between the two kinds of bitumen may vary all according to the dispensary of the material mixture, but a typical ratio can be 60%PC% high viscid and 40%PC% low viscid bitumen.
• a typical ratio can be 60%PC% high viscid and 40%PC% low viscid bitumen.
• the applied mixing plant can be a simple batch mixer or a continuous throughflow mixer, but it would be possible to use separate mixers for the mixing of the respective binding agents into the respective stone fractions and a separate mixer for the bringing together of the thus pretreated fractions.
• Stone material 60 weight percent of 4-16 mm coarse fraction, 40%PC% weight percent of 0-4 mm fine fraction.
• Binding agent emulsion Type 1: BE65R/20.000
• Type 2 BE65M/3.000.
• BE stands for "bitumen emulsion”
• 65 for the admixtury percentage of the bitumen
• R for a rapidly breaking emulsion
• M for a medium breaking emulsion
• 20.000 and 3.000 for the viscosity of the respective bitumens, measured by mm 2 /sec. at 60° C.
• the breaking time for the emulsion type 1 on the coarse fraction type of atones is a certain amount of seconds, e.g. 12-14 seconds.
• the coarse fraction is introduced currently and without heating into a flow-through mixer, at the entrance end of which the emulsion of the said type 1 is added by a flow corresponding to a weight amount of 7-8 %PC% of the stone weight.
• the aqueous solution of the emulsion will be distributed evenly around the atones in few seconds.
• a flow of the fine stone fraction and emulsion type 2 at a weight ratio of some 100:8 is added.
• the total product is conveyed further in the mixer for intensive mixing through additional 20-30 seconds, corresponding approximately to the breaking time of the emulsion type 2, whereafter the mixture is let out in a flow to a carrier truck.
• the truck takes the collected material portion to a delivery apparatus at the working site, where the laying out is effected not later than 4-5 hours after the preparation of the material mixture.
• Stone material 60 weight percent of 5-18 mm coarse fraction 40 weight percent of 0-5 mm fine fraction.
• B stands for a pure or non-emulgated bitumen, while the figure 180 refers to a penetration of 180 at 25° C, corresponding to a viscosity of some 60.000 mm 2 /sec at 60° C.
• MB 3.000 denotes the non-emulgated bitumen having a viscosity of 3.000 mm 2 /sec at 60° C.
• 1800 kg stones of the coarse fraction heated to some 130° C is filled into a charge mixer, and after start of the mixer 90 kg binding agent type 1, heated to some 130° C is added. 8-12 seconds thereafter 1200 kg of the fine fraction is added, this fraction not having to be heated, and also 60 kg binding agent type 2, heated to roughly 90° C.
• the delivery temperature in the mixer can be some 60° C.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Road Paving Structures (AREA)
• Colloid Chemistry (AREA)
• Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)
• Cosmetics (AREA)
• Tires In General (AREA)

Applications Claiming Priority (4)

Publications (2)

Family

ID=8108092

Family Applications (1)

Country Status (11)

Families Citing this family (5)

Family Cites Families (5)

• 1991
  • 1991-10-30 DK DK911793A patent/DK179391D0/da not_active Application Discontinuation
• 1992
  • 1992-10-30 DK DK92922931T patent/DK0624214T3/da active
  • 1992-10-30 CA CA002122497A patent/CA2122497A1/en not_active Abandoned
  • 1992-10-30 AT AT92922931T patent/ATE176286T1/de active
  • 1992-10-30 ES ES92922931T patent/ES2129459T3/es not_active Expired - Lifetime
  • 1992-10-30 DE DE69228321T patent/DE69228321T2/de not_active Expired - Fee Related
  • 1992-10-30 AU AU29026/92A patent/AU2902692A/en not_active Abandoned
  • 1992-10-30 WO PCT/DK1992/000315 patent/WO1993009295A1/en active IP Right Grant
  • 1992-10-30 EP EP92922931A patent/EP0624214B1/en not_active Expired - Lifetime
• 1994
  • 1994-04-27 NO NO941545A patent/NO305567B1/no not_active IP Right Cessation
  • 1994-04-28 FI FI941957A patent/FI941957A/fi unknown
• 1999
  • 1999-04-26 GR GR990401134T patent/GR3030054T3/el unknown

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