Patent Application
20140161524
Not applicable to this application.
1. Field of the Invention
The present invention relates generally to a sealcoat and more specifically it relates to a sealcoat system for providing a sealcoat that is free of silica sand to reduce health risks for individuals exposed to the sealcoat.
2. Description of the Related Art
Any discussion of the related art throughout the specification should in no way be considered as an admission that such related art is widely known or forms part of common general knowledge in the field.
Asphalt is used for constructing a large percentage of the paved roadways, parking lots and residential driveways in the United States. Asphalt generally comprises a combination of aggregates (crushed stone and sand), filler (cement, hydrated lime or stone dust) and a bituminous binder (called asphalt cement or asphalt binder). When used in construction, asphalt has a number of advantages including smoothness when applied, ease of construction and durability. While asphalt construction has a number of advantages, asphalt can begin to break down due to oxidation, exposure to ultraviolet rays and exposure to oil and gas spills. The most common form of asphalt maintenance is the application of an asphalt sealant or sealcoat applied in a thin layer directly on the asphalt surface. Application of sealcoat provides a number of benefits including protecting the asphalt from exposure to oxygen and water, preventing ultraviolet rays from penetrating the asphalt, resisting damage caused by oil or gas spills, smoothing the asphalt surface and restoring the original look and color of the asphalt. Depending upon environmental conditions (sun exposure, temperature variation, amount of moisture) and traffic on the sealcoat, asphalt driveways may require the application of sealcoat every 1 to 3 years. Sealcoat generally comprises a mixture of emulsified asphalt, water, mineral fillers and various other mixtures. Sealcoat can be applied using a squeegee, stiff broom or mechanical sprayers/applicators. Representative sprayers/applicators include those disclosed in U.S. Pat. Nos. 3,533,336; 3,703,856; 3,841,779; 3,940,213; 3,989,403; 4,026,658; 4,302,128; 4,315,700; 4,575,279; 4,688,964; 4,831,958; 5,362,178; 5,735,952; 5,549,457; 6,102,615; and 6,290,428, all of which are herein incorporated by reference.
Conventional sealcoats are comprised of a sealer (coal tar emulsion, asphalt emulsion or oil based), water, silica sand and additives (e.g. rubber latex-based products). Silica sand is used within sealcoats to hide minor surface defects, improve traction for vehicles and improve durability. The silica sand is typically mixed with the sealer, water and additives on the job site to reduce settling of the silica sand within the container. An example composition for a sealcoat for a high traffic area would include 100 gallons of sealer, 30-60 gallons of water, 200-400 pounds of silica sand and 2-5 gallons of additives.
Once the silica sand is fully mixed with the water, sealer and additives, the sealcoat composition may be applied directly to the asphalt surface to sealcoat the asphalt surface. It typically takes approximately 24-48 hours before the sealcoat dries sufficiently to allow traffic upon the sealcoat.
While silica sand provides many benefits for sealcoats, it is well-known that silica sand presents significant health risks if not properly handled. Prolonged exposure to silica sand can lead to a chronic condition known as silicosis. Workers handling silica sand must wear respirators or masks to prevent lung irritation. There are also environmental concerns about silica being used in sealcoats.
Because of the inherent problems with using silica sand within sealcoats, there is a need for a new and improved sealcoat that is free of silica sand.
The invention generally relates to a sealcoat which includes providing a sealer, crushed glass, water and an additive, mixing the sealer together with the crushed glass, water and additive to form a sealcoat composition, and applying the sealcoat composition to a road. The crushed glass is preferably comprised of soda-lime glass and is further preferably comprised of container glass used in the production of bottles and jars.
There has thus been outlined, rather broadly, some of the features of the invention in order that the detailed description thereof may be better understood, and in order that the present contribution to the art may be better appreciated. There are additional features of the invention that will be described hereinafter and that will form the subject matter of the claims appended hereto. In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction or to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of the description and should not be regarded as limiting.
Various other objects, features and attendant advantages of the present invention will become fully appreciated as the same becomes better understood when considered in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the several views, and wherein:
Turning now descriptively to the drawings, in which similar reference characters denote similar elements throughout the several views,
The sealer 30 may be comprised of any conventional sealer 30 used in the sealcoating industry such as but not limited to coal tar emulsion sealer 30, asphalt emulsion sealer 30 or oil based sealer 30. Coal tar emulsion sealer 30 is a durable sealer 30 and is created as a result of the coking process in steel manufacturing. The asphalt emulsion sealer 30 is also a durable sealer 30 that is derived from asphalt (bitumen) and is typically comprised of asphalt, water 50 and a small amount of an emulsifying agent. The oil based sealer 30 is comprised of asphaltic chemicals based with an oil composition. It can be appreciated that various other types of sealer 30 may be utilized.
One or more additives 60 may be utilized within the present invention. The additive 60 may be comprised of any conventional additive 60 used in the sealcoating industry such as but not limited to rubber latex-based products. The usage of latex rubberizing additives 60 help suspend the crushed glass 40 within the sealcoat 20 composition while in the liquid state, assists in drying the sealcoat 20 once applied to a road 14, assists with bonding of the sealcoat 20 to the road 14 and increases the useful life of the sealcoat 20 on the surface of a road 14.
The present invention utilizes crushed glass 40 instead of silica sand or crushed sand. The crushed glass 40 is comprised of a plurality of small glass particles. The present invention preferably utilizes recycled glass from discarded bottles, jars and the like. In particular, the crushed glass 40 is preferably formed from soda-lime glass which is divided into two main groups: (a) flat glass (e.g. for windowpanes) produced by a float glass process and (b) container glass (e.g. for glass containers such as bottles, jars, drink ware, pitchers, vases and bowls) produced by blowing and pressing processes.
The crushed glass 40 is preferably comprised of container glass which is typically produced by blowing and pressing techniques. The crushed glass 40 is further preferably comprised of recycled container glass (cullet) that is produced by crushing glass containers such as bottles and jars. The crushed glass 40 preferably does not include any flat glass.
The glass is crushed by a conventional glass crusher that pulverizes the glass to a desired size such as 360 mils. The crushed glass 40 typically will have a size of between 20 to 75 mesh AFS (American Foundrymen Specification) depending upon the surface to be sealed. Glass crushers have been utilized within glass recycling operations for years and typically include screens and separators to separate the crushed glass 40 based on the size thereof. Glass crushers are similar to rock crushers. One example of a glass crusher used in the glass recycling industry is the vertical shaft impactor (VSI) glass crusher which provides large scale glass crushing up to 125 tons per hour of crushed glass 40 cullet. U.S. Pat. No. 5,289,980 to Shinpo illustrates an exemplary Glass Vessel Crusher and is incorporated by reference into this patent application.
After the crushed glass 40 has the desired size for use in the sealcoat 20, the crushed glass 40 is purified (cleaned) utilizing a washing process and/or heat process. The washing process is well-known in the recycling industry and involves washing the crushed glass 40 with a liquid cleaner to remove non-glass particles (e.g. labels). The purification of the crushed glass 40 is preferably performed using a heat process such as applying heated air at high temperatures to the crushed glass 40 to sterilize and remove the non-glass particles from the glass by burning the non-glass particles (e.g. labels). The purified glass is then tumbled and screened through a mesh to ensure the proper size of crushed glass 40 is provided. The size of the crushed glass 40 may vary depending upon the application and is preferably the same or similar size as conventional silica sand used in conventional sealcoatings.
The mixer 70 may be comprised of any conventional sealcoating mixing equipment capable of mixing the sealer 30, crushed glass 40, water 50 and additive 60 together to form the sealcoat 20 in a liquid state. Various types of sealcoating mixing equipment may be used wherein a tank of the mixer 70 that receives the sealer 30, crushed glass 40, water 50 and additive 60 preferably mixes and agitates the sealcoating composition mechanically (hand or engine operated) or hydraulic agitation using a hydraulic pump. For smaller operations, the mixer 70 may be part of the sealcoating applicator 12 such as a tank on the sealcoating applicator 12.
The sealcoat 20 is produced by combining a volume of sealer 30 (e.g. 100 gallons), the purified crushed glass 40 (e.g. 200-400 pounds), a volume of water 50 (30-60 gallons) and a volume of additives 60 (e.g. 2-5 gallons) into a mixer 70. The composition is mixed thoroughly to ensure even distribution of the purified crushed glass 40 through the composition. After the sealcoat 20 is produced by the mixer 70, the sealcoat 20 is then applied by the sealcoating applicator 12 to the surface to be sealed such as a road 14. The sealcoat 20 may be applied in various thicknesses depending upon the number of coats applied and the volume rate of the sealcoat 20 dispensed. After application of the sealcoat 20 to the surface, it typically takes only approximately 7 hours for the sealcoat 20 to cure upon the surface sufficiently to be used again. When dried, the sealcoat 20 typically will have a thickness of 11-13 mils.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although methods and materials similar to or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described above. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety to the extent allowed by applicable law and regulations. The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired that the present embodiment be considered in all respects as illustrative and not restrictive. Any headings utilized within the description are for convenience only and have no legal or limiting effect.
I hereby claim benefit under Title 35, United States Code, Section 119(e) of U.S. provisional patent application Ser. No. 61/726,083 filed Nov. 14, 2012. The 61/726,083 application is currently pending. The 61/726,083 application is hereby incorporated by reference into this application.
| Number | Date | Country | |
|---|---|---|---|
| 61726083 | Nov 2012 | US |
