Risk of environmental contamination arising from concrete structures, Part II: Toxic substance
- Title
- Risk of environmental contamination arising from concrete structures, Part II: Toxic substance
- Author
- 안기용
- Keywords
- hexavalent chromium; cement; spectrophotometer; immobilisation; HEXAVALENT CHROMIUM; BLENDED CEMENT; XRD ANALYSES; CR(VI); LEACHABILITY; HYDRATION; CHROMATE
- Issue Date
- 2015-09
- Publisher
- KOREAN SOCIETY OF CIVIL ENGINEERS-KSCE
- Citation
- KSCE JOURNAL OF CIVIL ENGINEERING, v. 19, No. 6, Page. 1591-1596
- Abstract
- 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 C(3)A or ettringite, being postulated in previous studies.
- URI
- https://link.springer.com/article/10.1007%2Fs12205-014-0122-1http://hdl.handle.net/20.500.11754/36981
- ISSN
- 1976-3808; 1226-7988
- DOI
- 10.1007/s12205-014-0122-1
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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