SE—Structures and Environment: Corrosion of Steel Reinforcement in Mortar exposed to Hydrogen Sulphide, Part 2: Diffusion Tests
✍ Scribed by Ahmed F. Idriss; Satish C. Negi; Jan C. Jofriet; Gordon L. Hayward
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 292 KB
- Volume
- 79
- Category
- Article
- ISSN
- 0021-8634
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✦ Synopsis
Reinforced concrete in livestock buildings is subject to severe corrosion if manure is stored below slatted #oors. The major corrosive agent is hydrogen sulphide. Laboratory di!usion tests were conducted on mortar specimens to allow the prediction of sulphur concentrations in concrete components in a barn. Di!usion coe$cients for H S were determined at 90, 180, 270 and 360 days for six treatments and used in 12 "nite element analyses. The results for specimens made with 8% silica fume cement replacement (SFC) performed best and con"rmed the results of the impressed voltage and of the electrochemical potential tests reported in Part 1. Similarly, the results for specimens made with Portland cement using a water}cement ratio of 0)55 (PC55) performed poorest, again con"rming the results of the impressed voltage and of the electrochemical potential tests reported in Part 1. The remaining specimens performed better than PC55 and worse than SFC. The di!usion coe$cients were used in "nite element di!usion analyses of a single slat. The results indicate that the use of silica fume cement for the concrete approximately doubled the life of a #oor slat when compared with Portland cement with a water}cement ratio of 0)45.