Quantitative analysis of the microstructure of interfaces in steel reinforced concrete
- School of Civil Engineering, University of Leeds, Leeds, LS2 9JT (United Kingdom)
- Institute for Materials Research, University of Leeds, Leeds, LS2 9JT (United Kingdom)
This article reports the results of a backscattered electron imaging study of the microstructure of the steel- and aggregate-cement paste interfaces in concrete containing 9 mm ribbed reinforcing bars. The water to cement (w/c) ratio, hydration age, steel orientation, and surface finish were varied. For vertically cast bars, there was more calcium hydroxide (CH) and porosity and less unreacted cement at both the steel- and aggregate-cement paste interfaces when compared to the bulk cement paste. As the hydration age increased, the porosity near the interfaces decreased, and the CH increased with more CH close to the steel than to the aggregate. Horizontal bars had more porosity and less CH under them than above. An increase in the w/c ratio produced interfaces of higher porosity and lower levels of CH. Wire-brush cleaned bars had higher levels of CH at the steel-cement paste interface at 365 days when compared to uncleaned bars.
- OSTI ID:
- 21033053
- Journal Information:
- Cement and Concrete Research, Vol. 37, Issue 12; Other Information: DOI: 10.1016/j.cemconres.2007.08.026; PII: S0008-8846(07)00195-0; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
Similar Records
A study on high strength concrete prepared with large volumes of low calcium fly ash
Porosity study on free mineral addition cement paste