Compositions: coating or plastic – Coating or plastic compositions – Bituminous material or tarry residue
Patent
1997-08-04
1999-07-27
Brunsman, David
Compositions: coating or plastic
Coating or plastic compositions
Bituminous material or tarry residue
106316, C09D19500, C09D 702
Patent
active
059284188
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ART
1. Technical Field
The present invention relates to an additive composition for asphalt emulsion, a composition for asphalt emulsion and a composition for emulsification which are used for the preparation of an asphalt emulsion; an oil-in-water asphalt emulsion; a paving composition comprising aggregate and an oil-in-water asphalt emulsion; and a process for the preparation of the above composition for emulsification. The asphalt emulsion according to the present invention is excellent in stability as emulsion and mixability with aggregate, and is easy to control the decomposition time thereof, and the products (mainly asphalt) of breaking of the emulsion are excellent in adherence to aggregate. Further, the constructions executed by the use of the emulsion are excellent in stripping resistance. Other asphalt emulsions according to the present invention are used by mixing it with aggregate in plant or place in the use of open grade mixtures, dense grade mixtures, slurry seals, sand mixtures, reclaimed mixtures and so on, are excellent in stability as emulsion, mixability with aggregate and mixability with cement, and is easy to control the decomposition time thereof, and the products (mainly asphalt) of breaking of the emulsions are excellent in adherence to crushed stone. Further, the constructions, such as pavement, executed by the use of the emulsions are excellent in strength, endurance and stripping resistance.
2. Description of the Related Art
Bituminous materials obtained from petroleum, e.g., asphalt, tar and pitch, have widely been used from old as a paving material, a waterproof material and an adhesive and in the construction of railroads. However, bituminous materials are very poor in workability when used as such, owing to their extremely high adhesivenesses. Therefore, bituminous materials are used after their flowabilities are enhanced by a means such as heating (i.e., heat melting process), treatment to be in the form of emulsion by using a proper emulsifying agent and water, and dissolution in a suitable solvent, for securing a desirable workability
Among such emulsions of bituminous materials, aqueous emulsions of asphalt are generally called "asphalt emulsions". Such the asphalt emulsions are roughly classified into fast-decomposing emulsions (i.e., emulsions for application) which are directly applied to the object surface, and slow-decomposing ones (i.e., emulsions for blending) which are blended with aggregate. Although the surfactant to be used in the preparation of an asphalt emulsion is suitably selected from among anionic surfactants, cationic surfactants, nonionic surfactants and amphoteric surfactants, the kind thereof is generally determined depending upon the process of execution thereof.
Among the above asphalt emulsions, one for blending is mixed with aggregate, a filler and other components. The asphalt composition thus prepared is used for the construction of paving of a road. The so-called emulsion breaking is caused by the evaporation and elimination of aqueous components in the composition, after the execution of a road by using an asphalt composition. Thus, the asphalt is hardened to complete the construction of paving of a road.
Further, the kind of paving of a road to be formed and the properties and performance thereof vary depending upon the kind of aggregate to be used together with such the emulsion for blending. For example, an asphalt composition (an open grade mixture) comprising an emulsion for blending and an open grade aggregate is used in the execution of upper and lower subbases, or in the execution of surface drainage course. While an asphalt composition (a dense grade mixture) comprising an emulsion for blending and a dense grade aggregates is used in the execution of upper subbase or surface course. Further, a composition prepared by mixing an emulsion for blending with a fine aggregate or filler is used as slurry seal for the purpose of restoring a deteriorated area of pavement, and a composition (a sand mixture) prepared by mixing it
REFERENCES:
patent: 5650000 (1997-07-01), Shuey et al.
Asamori Katsuhiko
Funada Hitoshi
Sasaki Hirotaka
Tamaki Ryoichi
Taniguchi Takao
Brunsman David
Kao Corporation
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