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Title: CORROSIVITY OF INDIANA BOTTOM ASH
Accession Number: 00625179
Record Type: Component
Availability: Find a library where document is available Abstract: Current studies of the engineering properties of bottom ash have justified its use in many kinds of highway construction, such as backfill, embankment, subbase, and even base courses. However, the electrochemical characteristics of bottom ash are still not well known, and neither is its corrosivity to the metal structures that are commonly included in highway construction. A simple corrosivity test and corrosivity evaluation results are presented for Indiana bottom ashes to clarify the extent of this problem. Four corrosivity parameters were used to estimate the corrosivity of bottom ash: minimum electrical resistivity (r), pH, soluble chloride content, and soluble sulfate content. The corresponding noncorrosive limits are proposed to be a minimum resistivity of 1,500 ohm-cm, a minimum pH of 5.5, a maximum soluble chloride of 200 ppm, and a maximum soluble sulfate of 1,000 ppm. Eleven bottom ashes collected from 10 power plants in Indiana were tested. The r varied from 200 to 7,000 ohm-cm, the pH from 3 to 10, the chloride content from 0.4 to 16 ppm, and the sulfate content from 50 to 1,100 ppm. At least 7 of the 11 bottom ashes tested were therefore classified as corrosive. Most Indiana bottom ashes are potentially corrosive. If the same holds true for bottom ashes produced in other states, the following actions are recommended before use in the vicinity of the metal structure in highway construction: (a) thoroughly examine the corrosion potential of the bottom ashes proposed for use; (b) pretreat the potentially corrosive bottom ashes, either at the power plant source or on the site of use; and (c) use corrosion-resistant metal members or plastic substitutes.
Supplemental Notes: This paper appears in Transportation Research Record No. 1345, Geoenvironmental and Engineering Properties of Rock, Soil, and Aggregate. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
Monograph Accession #: 01404972
Language: English
Authors: Ke, T-CLovell, C WPagination: p. 113-117
Publication Date: 1992
Serial: ISBN: 0309052084
Features: Figures
(3)
; References
(17)
; Tables
(3)
TRT Terms: Uncontrolled Terms: Geographic Terms: Old TRIS Terms: Subject Areas: Geotechnology; Highways; Materials; Research; I35: Miscellaneous Materials
Files: TRIS, TRB
Created Date: Oct 22 1993 12:00AM
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