Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Reexamination Certificate
2000-08-31
2001-10-23
Green, Anthony (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
C106S634000, C106S728000, C106S802000, C106S823000, C206S219000, C366S002000, C366S003000
Reexamination Certificate
active
06306210
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to an improved technique for conveniently adding highly effective migrating corrosion inhibitors to raw concrete, and including a technique for controllably and reliably adding such inhibitors to raw concrete mixes. The present invention utilizes a water soluble envelope or bag into which highly effective corrosion inhibitors are packaged, with the entire bag along with its contents being conveniently added to concrete mixes, including those mixes in the process of being blended in either stationary or portable mixers. Selected migrating corrosion inhibitors (MCI) comprising an alkali metal gluconate such as sodium gluconate and ammonium benzoate, and other dry inhibitors are blended and conveniently packaged in a water soluble bag, pouch or envelope in order to provide a measured and convenient method of adding such inhibitors to form complete concrete admixtures. These corrosion inhibitors, when added to the raw concrete mix, have been found to provide effective long-term protection for reinforcements including rebar as conventionally employed in concrete structures.
The formulations of the present invention are employed without reduction of the inherent strength of the concrete. Indeed, the strength, durability and appearance of the finished concrete are virtually unaltered, and when employed with a plasticizer, the mix remains fresh and plastic to permit more appropriate working.
In the past, certain types of migrating corrosion inhibitors have been blended with raw concrete in order to provide effective long-term rebar protection. While this form of addition has been effective, the entire process is improved, simplified and expedited when the MCI materials of the present invention are pre-packaged in containers so that the entire package may be added to and blended with the concrete mix. The present invention employs highly effective MCI materials which are packaged in water soluble bags or pouches, and thereby added at a known rate or in a predetermined quantity to concrete mix. As such, the MCI materials of the present invention are as well conveniently controlled, and rendered available for ultimate end use.
The bag containing the MCI chemicals is added to the raw concrete so that the ingredients become thoroughly mixed. Mixing is typically undertaken either on the site or in a central batching and mixing location with the fresh concrete being taken and delivered to the site and revolving drum ready-mix trucks.
In addition to those mixtures set forth herein, suitable MCI mixtures which are also well adapted to concrete are disclosed in U.S. Pat. No. 5,597,514 entitled “CORROSION INHIBITORS FOR REDUCING CORROSION IN METALLIC CONCRETE REINFORCEMENT”, and assigned to the same assignee as the present invention. In addition to being highly effective as migrating inhibitors for the present application in concrete, these inhibitors have also been found to be soundly adapted for packaging in water soluble bags.
SUMMARY OF THE INVENTION
In accordance with the present invention, pre-measured quantities of a selected MCI chemical compound is packaged in a water soluble bag or pouch, and thus rendered appropriate for use in raw concrete mixes. The contents of bags may be controllably adjusted and/or variable, thereby enabling the process to be utilized with small on-site mixers, as well as in the well known revolving drum truck-mounted systems. In either event, the appropriate amount of MCI chemical can be conveniently added to the mix and blended, with the water soluble bags dissolving and ultimately becoming fully dispersed throughout the mix. Because of the low quantity of bag or pouch material being employed, the physical and mechanical properties of the concrete are only moderately affected.
While the formulations of the selected MCI materials may be retained appropriately in water soluble bags, in certain environments and geographical regions, it may be appropriate to package the water soluble bags within a polyethylene bag prior to use in order to protect the contents against exposure to humidity and water. Water soluble bags are available commercially, with one such type being available from Aquafilm Co. of Winston Salem, N.C. under the trade designation “L Series”.
Therefore, it is a primary object of the present invention to provide an improved form of packaging for MCI chemicals which are selected for use as additives as corrosion inhibitors used in admixture with raw concrete.
It is a further object of the present invention to employ migrating corrosion inhibitors such as sodium gluconate and ammonium benzoate which may be packaged in powder form in a water soluble bag or pouch to provide a pre-measured and convenient method of adding these inhibitors to concrete admixtures for effective long-term rebar protection.
Other and further objects of the present invention will become apparent to those skilled in the art upon a study of the following specification and appended claims.
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patent: 5203629 (1993-04-01), Valle et al.
patent: 5224774 (1993-07-01), Valle et al.
patent: 5320851 (1994-06-01), de Mars et al.
patent: 5326529 (1994-07-01), Miksic et al.
patent: 5597514 (1997-01-01), Miksic et al.
patent: 5728209 (1998-03-01), Bury et al.
patent: 5989334 (1999-11-01), Dry
Kharshan Margarita
Miksic Boris A.
Cortec Corporation
Green Anthony
Haugen Law Firm PLLP
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