Risk of Environmental Contamination Arising from Concrete Structures, Part II: Toxic Substance

The present study concerns the immobilisation of hexavalent chromium (Cr (VI)) ions in the cement matrix. Both the water-soluble and acid-soluble Cr (VI) ions in cement were measured using the spectrophotometer. As a result, the concentration of water-soluble Cr (VI) in cement ranged from 12.3 to 19.0 mg/kg-cem, and the dissolution of acid soluble Cr (VI) was strongly dependent on the pH of solvent, ranging from 172.4 to 318.2 mg/kg-cem. Simultaneously, the influence of cement hydration on the Cr (VI) solubility was investigated. After a cement hydration for 28 days, the water-soluble Cr (VI) was sharply decreased to about 2.0 mg/kg-cem, whilst no particular change in the acid-soluble Cr (VI) was observed. The reduction of water-soluble Cr (VI) may be attributed to a physical adorption of Cr (VI) ions in the cement matrix then to immobilise them, rather than chemical reaction with C3A or ettringite, being postulated in previous studies.

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Availability:
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Supplemental Notes:
- © Korean Society of Civil Engineers and Springer-Verlag Berlin Heidelberg 2015.
Authors:
- Jung, M S
- Hwang, J P
- Kim, J H
- Lee, C K
- Ann, K Y
Publication Date: 2015-9

Language

English

Media Info

Media Type: Web
Features: References;
Pagination: pp 1591-1596
Serial:
- KSCE Journal of Civil Engineering
- Volume: 19
- Issue Number: 6
- Publisher: Korean Society of Civil Engineers
- ISSN: 1226-7988
- EISSN: 1976-3808
- Serial URL: http://link.springer.com/journal/12205

Subject/Index Terms

TRT Terms: Cement; Chromium; Concrete structures; Contaminants; Environmental impacts; Environmental risk assessment; Hydration; Poisons
Subject Areas: Bridges and other structures; Environment; Highways; Materials;

Filing Info

Accession Number: 01632974
Record Type: Publication
Files: TRIS
Created Date: Feb 7 2017 2:47PM