Temperature-Adjusted and Modified Recycled ASCON Composition for Reusing 100% of Waste ASCON for Road Pavement, and Method for Manufacturing Same

• US 20120167802A1
• Filed: 03/07/2012
• Published: 07/05/2012
• Est. Priority Date: 09/07/2009
• Status: Abandoned Application

• Current Assignee: Jung D.O. Huh
• Original Assignee: Jung D.O. Huh
• Inventors: HUH, Jung Do
• Application Number:
  US13/414,466
• Publication Number:
  US 20120167802A1
• Time in Patent Office: Days
• US Class Current: 106/669
• CPC Class Codes: C04B 14/047 Zeolites
• CPC Class Codes: C04B 14/06 Quartz; Sand
• CPC Class Codes: C04B 14/104 Bentonite, e.g. montmorillonite
• CPC Class Codes: C04B 14/20 Mica; Vermiculite mechanical splitting B28D
• CPC Class Codes: C04B 14/28 of calcium
• CPC Class Codes: C04B 18/08 Flue dust , i.e. fly ash
• CPC Class Codes: C04B 18/141 Slags
• CPC Class Codes: C04B 2111/0075 for road construction
• CPC Class Codes: C04B 22/064 of the alkaline-earth metals
• CPC Class Codes: C04B 22/143 Calcium-sulfate
• CPC Class Codes: C04B 26/26 Bituminous materials, e.g. tar, pitch C08L95/00 takes precedence
• CPC Class Codes: C04B 7/02 Portland cement
• CPC Class Codes: E01C 19/1004 Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof E01C19/1036 takes precedence
• CPC Class Codes: Y02A 30/30 in transportation, e.g. on roads, waterways or railways
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

The present invention provides the composition of the modified RAP-recycled warm mix asphalt, whose composition is characterized as consisting of a mixed asphalt concrete mix, a cohesive agent, a recycling modifier, a plasticized warm mix additive, and if necessary, reinforcing agent will be added to the composition. The aforementioned composition can be mixed to produce the modified RAP-recycled warm mix asphalt. This invention is characterized in reusing a great portion of RAP compared to the less use in the existing practice. The use of a recycling modifier improves further better performance properties to extend the life cycle of recycled asphalt pavements, compared to the conventional virgin asphalt pavements as well as the existing recycling ones. The plasticized warm mix additives offer economic, social, and technical advantages by saving the fuel consumption required for production, reducing greenhouse gas emissions, and shorten traffic opening times.

Claims

1. Compositions of modified RAP-recycled warm mix asphalt are characterized to include 100 parts by weight of mixed asphalt concrete mix of various particle-size distribution below the maximum size of 50 mm, 0.1 to 8.0 parts by weight of cohesive agents, 0.3 to 2.0 parts by weight of recycling modifiers and 0.1 to 1.0 parts by weight of plasticized warm mix additives.

2. Compositions of a modified RAP-recycled warm mix asphalt according to claim 1, wherein a mixed asphalt concrete mix, composed of 100 wt % by summing the weight of the RAP(Reclaimed Asphalt Pavement) below 100 wt % and the weight of a virgin asphalt concrete mix below 100 wt %, can have one of aggregate gradations among dense-graded aggregates, fine- or coarse-graded aggregates, microgranular aggregates, Superpave aggregates, porous aggregates, gap-graded aggregates, SMA (Ston Matrix Aggregates), open-graded aggregates and arbitrary gradations, but whose gradations can be met by adjusting the particle sizes of the said RAP and the virgin asphalt concrete mix, and whose maximum particle size is below 50 mm for a base layer, below 38 mm for an intermediate layer, below 26 mm for a surface layer, below 13 mm for a surface wearing course, below 2.5 mm for a surface slurry layer or a crack sealer, and below 0.6 mm for thin surface coating, but all these sizes arbitrarily changed.

3. Compositions of a modified RAP-recycled warm mix asphalt according to claim 1, wherein a cohesive agent is an asphalt binder or any chemical compound highly compatible with an asphalt binder whose viscosity is equal to or lower than the asphalt binder at high-temperatures (100°

C. above) and whose flash point is greater than 180°

C., which includes one or more of the selected materials;

hydrocarbon oils, aromatic processing oils, aliphatic processing oils, aliphatic-aromatic mixed processing oils, heavy oils, various industrial and commercial rejuvenators, cationic asphalt emulsions, anionic asphalt emulsions, nonionic asphalt emulsions, BTX (Benzen Toluene Xylene) oils, asphalt binders for road pavements, cutback asphalt primers, organic acids (adipic acids, fumaric acids, oxalic acids, maleic anhydrides, stearic acids, oleic acids, palmitic acids, terephthalic acids, lauric acids, etc.), organic acid salts, organic amines, MMA (methylmethacrylate) solutions, unsaturated polyester, animal oils (cow, pig, fish oils, etc.), vegetable oils (bean, corn, sesame, perilla, coconut seed, coconut cake, palm, palm cake, palm sludge, linseed oil, cotton seed oil, wool plannel cator oil, etc.), animal-vegetable oil mixture, castor oil, mineral oil, bunker C oil, bunker B oil, bunker A oil, glycerol, grease, waxes, waste and refined industrial oils (lubricants, rolling oils, heat transfer oils, engine oils), refined and wasted shipping motor oils, refined and wasted compressor oils, phosphoric acid, wasted motor oils, and all their mixtures, etc.

4. Compositions of a modified RAP-recycled warm mix asphalt according to claim 1, wherein a recycling modifier is composed of 100 wt % by summing the weight of an elastic polymer below 100 wt % and the weight of a viscous polymer below 100wt %, provided that a certain part by weight of this recycling modifier can be used in the range of 0.3 to 2.0 parts by weight either in the form of a solid whose particle diameter is 3 mm or below such as fine particles or powders, or in the form of a liquid dispersion whose particle diameter is 0.5 mm or below, and the recycling modifier can be added to the mixture, independent or dependent of a cohesive agent.

5. Compositions of a modified RAP-recycled warm mix asphalt according to claim 4, wherein the said elastic polymers include thermoplastic elastomers and rubbers including SBS(Styrene-Butadiene-Styrene), SBR(Styrene-Butadiene Rubber), SEBS(Styrene-Ethylene-Butadiene-Styrene), PU(Polyurethane), SIS(Styrene-Isoprene-Styrene), ABR(Acrylobutadiene Rubber), polychloroprene rubber, butyl rubber, natural rubber, crumb rubber, NBR (Nitril Butadiene Rubber), isoprene rubber, EPDM (Ethylene-Propylene-Diene-Monomer Rubber), butadiene rubber, and waste rubber powder, and mixtures containing one or more of the aforementioned elastic polymers.

6. Compositions of a modified RAP-recycled warm mix asphalt according to claim 4, wherein the viscous polymers include all thermoplastic polymers, such as high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), polypropylene (PP), co-polypropylene (CPP), petroleum resin, polyvinylbutyral, polystyrene (PS), high impact polystyrene (HIPS), low molecular weight polyamide, elvaloy, polyvinylacetate (PVA), ethylene-vinyl acetate (EVA), polybutene(PB), acrylic latex, nitro-cellulose, ethyl cellulose, polyphosphoric acid, acrylo-nitril-butadiene Copolymer (ABS), Kopel, rosin and mixtures containing one or more of the aforementioned viscous polymers.

7. Compositions of a modified RAP-recycled warm mix asphalt according to claim 1, wherein a plasticized warm mix additive is characterized to be 100 wt % by adding the weight of a plasticizer which is below 100 wt % to the weight of a warm mix additive which is below 100 wt %, provided that the plasticized warm mix additive occupies from 0.1 to 1.0 part by weight of the composition.

8. Compositions of a modified RAP-recycled warm mix asphalt according to claim 7, wherein plasticizers defined as ester compounds produced by reacting organic acids with alcohols (or an amins), whose flash point should be above 180°

C. can be classified as many different types. For instance, the phthalate esters including DOP(Di-2-ethylhexyl-phthalate), DBP(Di-butyl-phthalate), DINP(Di-isononyl phthalate), DNOP(Di-n-octyl phthalate), DIDP(Di-isodecyl phthalate), BBP(Butyl benzyl phthalate) and their mixtures;

the trimellitic acid esters including TOTM(Tri-ethylhexyl trimellitate), TINTM(Tri-isononyl trimellitate), TIDTM(Tri-isodecyl trimellitate) and their mixtures;

the phosphoric acid esters including TCP(Tri-cresyl phosphate), TOP(Tri-ethylhexyl phosphate), CDP(Cresyl diphenyl phosphate) and their mixtures;

the epoxy esters including ESO(epoxidized soybean oil), ELO(epoxidized linseed oil), and their mixtures;

the polyesters with low degrees of polymerization (whose average molecular weight ranges between 1,000 and 8,000) including adipic acid polyester;

the aliphatic acid esters including i-Octyl palmitate, i-Octyl Stearate, i-Octyl Oleate, i-tri-Decyl Stearate, Lauryl Oleate, di-i-Octyl Stearate, di-i-tri-Decyl Adipate, Pentyl Glycol-di-Oleate, Glycerine-tri-Oleate, Neo-Pentylglycol-di-Oleate, tri-Methylolpropane-tri-fatty acid ester, tri-Methylolpropane-tri-Laurate, tri-Methylolpropane-tri-Coconate, tri-Methylolpropane-tri-Oleate, penta-Erythritol-tetra-Sebacate, penta-erythritol-tetra-Fatty Acid Ester, penta-erythritol-tetra-Oleate, tri-Methylolpropane Complex Ester, penta-Erythritol Complex ester, bis-2-(2-butoxyethoxy)ethyl adipate, DOC(Dioctyl Citrate), DOM(Dioctyl Maleate), DOA(Di-2-ethylhexyl adipate), DINA(Diisononyl Adipate), DOZ(Di-2-ethylhexyl azelate), DIDA(Di-isodecyl adipate) and their mixtures, and the surfactants made by reacting fatty acids with amines including;

di-esters (esterification of fatty acids and triethanolamines), modified di-esters (trans-esterification of plant oils and triethanol amines), imidazolines and their mixtures.

9. Compositions of a modified RAP-recycled warm mix asphalt according to claim 7, wherein warm mix additives refer to waxes or water blowing agents or chemical blowing agents among which waxes include paraffin wax, micro-crystalline wax, montan wax, Saesol wax, Carnauba wax, PE-wax, EVA-wax, PP-wax, hydrogenated castor oil, hardened castor oil, aliphatic petroleum resin, aromatic petroleum resin, aliphatic-aromatic petroleum resin, 12-hydroxy stearate, lauric amide, ethylene-bis-stearamide, stearic acid amide, oleic acid amide, erucic acid amide, N-oleic stearic acid amide, N-stearic stearic acid amide, N-stearic erucic amide, D-heptane decyl ketone (stearon:

CH₃(CH₂)₁₆—

CO—

(CH₂)₁₆CH₃), pine tree tar, resin, resin salt, and their mixtures;

or water blowing agents capable of evaporation at 100°

C. include water, inorganic powder containing water (zeolite, bentonite, silica gel, clay, mica, calcium chloride, etc), magnesium hydroxide, calcium hydroxide, aluminum hydroxide, fillers containing water, crushed sand containing water, or natural sand, emulsifier (EVA-emulsifer, acrylic emulsifier, cationic, anionic, non-ionic emulsified asphalt, etc.), surfactants containing water (cationic, anionic, and non-ionic), latex (SBR, NBR, isoprene, natural rubber), water-soluble polymer solutions [CMC(Carboxy-Methy-Cellulose), PAA(Poly-Acryl-Amide), PEO(Poly-Ethylene-Oxide), PVA(Poly-Vinyl-Alcohol), poly-vinyl-acetate, glycol] and their mixtures;

or chemical blowing agents capable of foaming below 135°

C. include azo-dicarbon-amide, modified azo-dicarbon-amide, azo-bis-isobutyro-nitrile [(AZDN)(CH3)₂(CN)C—

N═

N—

C(CN)(CH3)₂], N′

-Dimethy-N, N′

-dinitroso-terephthalamide (NTA), [(C6H4)-[Con(CH3)-NO]2], sodium bicarbonate, ammonium bicarbonate and their mixtures.

10. Compositions of a modified RAP-recycled warm mix asphalt according to claim 1, wherein 0.1 to 2.0 parts by weight of reinforcing materials consisting of one or more among inorganic powder, organic powder, and short fiber can be added to enhance mechanical properties of the modified recycled warm mix asphalt, of which the inorganic and the organic powders contain calcium carbonate powder, limestone powder, fine aggregate, waste toner, silica, bentonite, zeolite, clay, mica, carbon black, steel slag powder, furnace slag powder, plastic refuse-derived fuel (RDF), flammable refuse-drived fuel (RDF), biomass powder, organic and inorganic color pigments, paper powder, waste plastic powder, sawdust, various cements, fly ash, gypsum powder, clay powder, quicklime, slaked lime, and their mixtures, and of which short fibers consist of nylon short fibers, polyester short fibers, PE short fibers, PP short fibers, short carbon fibers, short cellulose fibers, short glass fibers, asbestos fibers, and their mixtures.