Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS20110222965 A1
Publication typeApplication
Application numberUS 13/034,439
Publication dateSep 15, 2011
Filing dateFeb 24, 2011
Priority dateMar 10, 2010
Publication number034439, 13034439, US 2011/0222965 A1, US 2011/222965 A1, US 20110222965 A1, US 20110222965A1, US 2011222965 A1, US 2011222965A1, US-A1-20110222965, US-A1-2011222965, US2011/0222965A1, US2011/222965A1, US20110222965 A1, US20110222965A1, US2011222965 A1, US2011222965A1
InventorsDennis Copp
Original AssigneeDennis Copp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method for Chip Seal Coating
US 20110222965 A1
Abstract
This invention relates to a method for chip seal coating. Aggregate is pre-coated, at ambient temperature, with an emulsion. The pre-coated aggregate is then allowed to sit, preferably for at least 24 hours, to allow the mixture to break into the asphalt and soapy water components of the mixture. The aggregate is then air dried to a moisture content of between 1 percent minimum to a maximum of 15 percent. A paved surface may be manufactured by first apply hot asphalt binder to a properly prepared base. The pre-coated aggregate is then spread on top of the binder. Using a roller, the aggregate is embedded into the binder and compacted.
Images(5)
Previous page
Next page
Claims(10)
1. A Method for Chip Seal Coating comprising the steps of:
selecting an aggregate;
selecting an asphalt emulsion;
mixing the asphalt emulsion with the aggregate to form a coated aggregate;
allowing the coated aggregate to dry to a moisture content of between 1 percent minimum to a maximum of 15 percent;
selecting a base to be chip seal coated;
applying a binder to the base;
applying the coated aggregate to the binder;
compacting the coated aggregate into the binder.
2. The method of claim 1 where the asphalt emulsion is cationic.
3. The method of claim 1 where the binder is hot asphalt.
4. The method of claim 1 where the binder is a mixture of asphalt and additives.
5. The method of claim 1 where the aggregate has a diameter between inch and ⅝ inch.
6. A Method for Chip Seal Coating comprising the steps of:
selecting an aggregate;
selecting an asphalt emulsion;
mixing the asphalt emulsion with the aggregate to form a coated aggregate;
allowing the coated aggregate to dry to a moisture content of between 1 percent minimum to a maximum of 15 percent;
selecting a base to be chip seal coated;
applying a binder to the base;
applying the coated aggregate to the asphalt binder;
compacting the coated aggregate into the asphalt binder.
7. The method of claim 6 where the asphalt emulsion is cationic.
8. The method of claim 6 where the binder is hot asphalt.
9. The method of claim 6 where the binder is a mixture of asphalt and additives.
10. The method of claim 6 where the aggregate has a diameter between inch and ⅝ inch.
Description
    PRIORITY
  • [0001]
    Priority is claimed based on the Mar. 10, 2010 filing of provisional application No. 61/312,490, said application being specifically incorporated herewith in its entirety by reference for all purposes.
  • BACKGROUND OF THE INVENTION
  • [0002]
    This invention relates to a new asphalt based method for a chip seal coating of paved surfaces.
  • [0003]
    Chip seal coating is commonly used in the repair or re-paving of existing paved surfaces, such as roads, airport runways and parking surfaces. During the application process, asphalt is heated to high temperatures to increase fluidity and adhesive properties. The heated asphalt, sometimes called an asphalt binder, is spread on the surface to be repaired or re-surfaced. Aggregate, consisting of various sized gravel particles are spread onto the asphalt binder and compressed into the binder. Prior to application, the aggregate must be pre-coated with asphalt. The process consists of heating the aggregate to high temperatures to remove dust and moisture on the aggregate. The aggregate is then coated with asphalt and delivered by truck to the site where the chip seal work is going on. The process of coating the aggregate is a very dusty and dirty process which requires substantial energy to heat the aggregate to proper temperatures. If the aggregate has any dust or moisture on it, it will not bind to the asphalt binder and a poor result will be achieved.
  • [0004]
    Emulsions are a mixture of asphalt and water and emulsifiers to create an asphalt mixture which will flow at low temperatures. An emulsion can be mixed with a fine aggregate to create a slurry seal. In other applications, an emulsion can be mixed with aggregate and used as a temporary patch to fill potholes in the cooler months. Emulsion based paving does not have the strength and durability of a hot asphalt mix.
  • [0005]
    It is an object of the present invention to provide for a chip seal coating for use on a pavement that is superior to the current product. It is a further object of the present invention to provide for a cheaper and easier method to manufacture the asphalt based paving material. It is a final object of the invention to provide for a more environmentally friendly means for coating the aggregate prior to insertion into the asphalt binder.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0006]
    FIG. 1 contains a view of the process of mixing aggregate and emulsion according to the present invention.
  • [0007]
    FIG. 2 contains a view of the process of drying the coated aggregate according to the present invention.
  • [0008]
    FIG. 3 contains a view of the process of applying coated aggregate to binder according to the present invention.
  • [0009]
    FIG. 4 contains a view of the process of compacting the coated aggregate into the binder to form a chip seal coating according to the present invention.
  • DETAILED DESCRIPTION OF INVENTION
  • [0010]
    The present invention relates to a method for chip seal coating. In the preferred embodiment, the objects of the present invention are accomplished by pre-coating a gravel aggregate with a cationic asphalt emulsion prior to applying the aggregate onto the hot asphalt binder. The aggregate and emulsion are mixed at ambient temperatures with sufficient emulsion to thoroughly coat the aggregate with emulsion. Because an emulsion is used to coat the aggregate, it is not necessary to heat the aggregate to high temperatures to clean it. The process is, therefore cleaner, cheaper and more efficient.
  • [0011]
    The process is started by selecting an aggregate (001) consisting of various sized gravel particles. The aggregate (001) may be of any shape, including round, rectangular, flat, elongated or odd shaped. The aggregate may be of uniform size or varying in diameter, depending on the factors present for the particular application. The aggregate (001) could also consist of crushed stone or manufactured by processes that would be obvious to those experienced in the trade, in lieu of using gravel. The aggregate may be washed to remove dust and any organic materials.
  • [0012]
    The next step is to thoroughly coat the aggregate with an asphalt emulsion (002) to create a coated aggregate (003). Asphalt emulsions (002) consist of a mixture of asphalt, water and a small amount of an emulsifying agent. The emulsion may be either anionic, cationic or non-ionic. In the preferred embodiment, a cationic emulsion is used. Ideally, the coated aggregate (003) will be between of 1 percent to 9 percent emulsion by weight. In the preferred embodiment, the coated aggregate (003) is 1 percent emulsion by weight. Any method of mixture is permissible, with the proviso that the aggregate (001) must be thoroughly coated with emulsion (002).
  • [0013]
    The coated aggregate (003) is then allowed to sit, preferably for at least 24 hours, to allow the mixture to break or separate into the asphalt and water-emulsifier components of the mixture. The asphalt will remain combined with the aggregate and the water-emulsifier component will evaporate away. After the break, the coated aggregate (003) should be allowed to air dry to a moisture content of between 1 percent minimum to a maximum of 15 percent.
  • [0014]
    After the aggregate is properly coated with emulsion to form the coated aggregate (003), a paved surface (005) may be chip sealed by first applying a binder (004) to a properly prepared base (005). The binder (004) adheres to the properly prepared base and serves as a bonding agent between the base (005) and the pre-coated aggregate (003). The binder should be hot asphalt or a mixture of asphalt and additives. The additives could include recycled car tires, or polymers designed to add elasticity to the binder. Hot asphalt is asphalt that has been heated to a temperature of at least 220 degrees Fahrenheit and not more than 425 degrees Fahrenheit. Where the binder is an asphalt mixed with an additive, it should also be heated to at least 220 degrees Fahrenheit and not more than 425 degrees Fahrenheit. The coated aggregate (003) is then spread on top of the binder(004). Using a pneumatic roller (006), the aggregate is embedded into the binder and compacted to create a compacted chip seal coating (007). After compaction, a top coat may be applied over the compacted chip seal coating.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2727827 *Mar 12, 1953Dec 20, 1955Jack O ChertkofLightweight aggregate and method of producing the same
US3832201 *Nov 3, 1972Aug 27, 1974Pavements Systems IncProcess for making asphalt paving compositions
US4025057 *Jul 18, 1974May 24, 1977Pavement Systems, Inc.Equipment for making asphalt paving compositions
US4089508 *Feb 18, 1976May 16, 1978Alliance Industries, Inc.Method of processing bituminous paving mixtures and apparatus therefor
US4238241 *Jul 12, 1978Dec 9, 1980Schneider Gordon LAcidic asphaltic composition and method
US4249890 *Jun 21, 1978Feb 10, 1981K. P. Graham & Associates Pty. Ltd.Production of heated bituminous mixes
US4721529 *Jan 27, 1986Jan 26, 1988Unichem International, Inc.Asphaltic compositions
US5262240 *Jul 6, 1992Nov 16, 1993The Goodyear Tire & Rubber CompanyAggregate treatment
US6623207 *Jun 7, 2001Sep 23, 2003Kmc Enterprises, Inc.Method of upgrading gravel and/or dirt roads and a composite road resulting therefrom
US7033104 *Sep 24, 2002Apr 25, 2006Manhole Adjusting ContractorsChip seal method with heating step
US7104724 *Aug 7, 2002Sep 12, 2006Highway Preservation System, Ltd.Apparatus for treating a pavement surface
US7662226 *Aug 1, 2007Feb 16, 2010American Gilsonite Company, Inc.Pretreated aggregate for hotmix asphalt concrete applications and other related applications
US7803222 *Jun 2, 2006Sep 28, 2010Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek TnoBitumen composition with improved ageing resistance
US7905949 *Sep 27, 2007Mar 15, 2011Meadwestvaco CorporationMethod for producing bituminous compositions
US20040057794 *Sep 24, 2002Mar 25, 2004John CorcoranChip seal method with heating step
US20100047015 *Aug 21, 2008Feb 25, 2010Basf SeComposition and process of using an asphalt emulsion to convert an unpaved surface into a paved surface
Classifications
U.S. Classification404/75
International ClassificationE01C7/35, E01C7/20
Cooperative ClassificationE01C7/187, E01C7/353
European ClassificationE01C7/18D, E01C7/35C