Long-term performance of pozzolanic materials in resisting corrosion of reinforcement in concrete
Pozzolanic materials are being used to make concrete durable although the mechanisms of their effects are not fully understood. This paper presents a combination of a microstructural and performance investigation with the objective of optimizing the utilisation of some of the more commonly used pozzolanic materials. In this study, fly ash and blast furnace slag (BFS) were used systematically in the increased percentages of 25, 50, and 70 per cent of total cementitious materials. Silica fume was mixed at the rate of 10 per cent forming various binary and ternary blends. Reinforced concrete slabs were cast and ponded for two years with 3 per cent NaCl solution simulating sea water salinity. Pore size distribution was utilized to evaluate the hydration mechanism in these blends. The results indicate that 25 per cent replacement of cement with fly ash and addition of 10 per cent silica fume is the optimum percentage in fly ash blends. The results indicate that higher volume ternary blends of 70 per cent BFS and 10 per cent silica fume can be beneficially utilized in chloride laden environment even though some reduction in compressive strength occurs. (a) For the covering record of this conference, please refer to ITRD abstract no E218284.
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Corporate Authors:
Concrete Institute of Australia
P.O. Box 3157
Rhodes, Australia 2138 -
Authors:
- AHMED, M S
- KAYALI, A
- Publication Date: 2009-9
Language
- English
Media Info
- Pagination: 10P
- Monograph Title: Concrete solutions 09: adding value in changing climates: 24th Biennial Conference of the Concrete Institute of Australia: 17-19 September 2009, Sydney
Subject/Index Terms
- TRT Terms: Concrete; Corrosion; Durability; Fly ash; Mixtures; Pozzolan; Reinforced concrete; Slag
- Subject Areas: Materials; I32: Concrete;
Filing Info
- Accession Number: 01153001
- Record Type: Publication
- Source Agency: ARRB
- Files: ITRD, ATRI
- Created Date: Mar 23 2010 9:10AM