Journal
CEMENT AND CONCRETE RESEARCH
Volume 61-62, Issue -, Pages 1-10Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2014.03.013
Keywords
reaction; corrosion; concrete; modeling; Other sewer
Funding
- Australian Research Council [LP0882016]
- Barwon Regional Water Corporation
- CH2M Hil
- Gold Coast Water
- Hunter Water Corporation
- Melbourne Water Corporation
- South Australia Water
- South East Water Limited
- Sydney Water Corporation
- United Water International
- Water Quality Research Australia
- Sewer Corrosion and Odour Research (SCORe)
- University of Queensland
- University of Sydney
- University of Technology Sydney
- Western Australia Water Corporation
- Australian Research Council [LP0882016] Funding Source: Australian Research Council
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Development of rational mathematical models for prediction of the likely present and future internal corrosion of reinforced concrete sewers requires understanding of the important physico-chemical processes, preferably based on field evidence. Samples of new and 70 year old pre-corroded concretes were exposed for up to 31 months in an aggressive sewer environment at 26 degrees C, 98% relative humidity and 79 ppm H2S concentration (averages). During the initial months of exposure the pH of the new concrete surfaces reduced rapidly however little corrosion loss was observed during this period. Subsequently pH reduced further, mass loss commenced and new concrete losses reached around 24 mm after 2 years. During the same period the old concrete corroded at an approximately constant rate. The presence of the corrosion product layer had negligible influence on corrosion losses. A bilinear corrosion loss model is proposed for practical applications. (C) 2014 Elsevier Ltd. All rights reserved.
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