Deicing composition

a composition and composition technology, applied in the field of deicing compositions, can solve the problems of significant traffic and safety problems, corrosive metals like iron, copper, aluminum, chlorides can be harmful to the environment, etc., and achieve the effect of moderate asr-aggravating effects

Inactive Publication Date: 2007-03-22
CLEMSON UNIVERSITY +1
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  • Description
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Benefits of technology

[0010] In another embodiment, in applications where corrosion concerns do not restrict their use, the incorporation of significant ratios of lithium compounds along with metal (e.g., sodium, potassium, calcium, and/o

Problems solved by technology

Snow and ice on concrete pavements such as airport runways, roads, sidewalks, bridges and the like can lead to significant traffic and safety issues.
These compounds while effective and relatively inexpensive are; however, very corrosive with respect to metals like iron, copper, aluminum, and the like.
In addition, such chlorides can be harmful to the environment.
Thus, while these materials may be acceptable in some applications, chloride-bearing deicers are not suitable for concrete surfaces, particularly those used by aircraft.
These formulations, however, can be toxic, corrosive, and some are highly flammable.
These compositions; however, tend to cause cracking and deterioration on the surface of the concrete structure and within the concrete matrix.
A major cause of this concrete deterioration is due to the alkali-silica reacti

Method used

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[0031] To demonstrate the effectiveness of the lithium portion of the deicer composition, the following experiments were conducted Mortars incorporating four different aggregates were cast into ASTM C 1260-type bars using ASTM C150 Type 1, high alkali (0.82% Na2Oeq) cement. The aggregate types were a limestone (“L”), a rhyollite (“R”), an argillite (“A”), and a quartzite (“Q”), and all have demonstrated deleterious ASR reactions in actual concrete structures in the field. Controls of 50 percent (6.4M) potassium acetate were used, and the mortar bars were stored in these solutions, and duplicates in the solutions described below, at 80° C. FIGS. 1-4 show the percent expansion versus age data for the mortar bars stored in the various concentrates (1M, 2M, 3M, 6.4M) of potassium acetate and with solutions incorporating lithium nitrate at a molar ratio of Li / K of 0.19. FIGS. 5-7 show the percent expansion versus age data for the mortar bars stored in the various concentrates (1M, 2M, 3M...

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Abstract

A deicing composition is provided. The composition includes a potassium or sodium salt of a carboxylic acid and a lithium salt of a carboxylic acid or lithium nitrate, wherein the molar ratio of lithium to potassium or lithium to sodium is from 10 percent to 80 percent.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims priority to U.S. Provisional Application Ser. No. 60 / 719,624, filed Sep. 22, 2005, the disclosure of which is incorporated by reference in its entirety.FIELD OF THE INVENTION [0002] The present invention relates to deicing compositions suitable for use on any outdoor exposed concrete surfaces such as airport runways, taxiways and aprons, highways, sidewalks, parking lots, etc. BACKGROUND OF THE INVENTION [0003] Snow and ice on concrete pavements such as airport runways, roads, sidewalks, bridges and the like can lead to significant traffic and safety issues. Thus, various compositions have been proposed to deice such concrete pavements. Historically, alkali and alkaline earth chlorides like sodium chloride, potassium chloride and calcium chloride have been used. These compounds while effective and relatively inexpensive are; however, very corrosive with respect to metals like iron, copper, aluminum, and the like. ...

Claims

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Application Information

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IPC IPC(8): C09K3/18
CPCC09K3/185C09K3/18
Inventor STOKES, DAVID B.JOHNSTON, DANIEL PERSONRANGARAJU, PRASADA RAOMEHTA, VIJAY C.MANISSERO, CLAUDIO E.
Owner CLEMSON UNIVERSITY
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