n IMIESA - Getting the most out of concrete sewers

Volume 44 Number 1
  • ISSN : 0257-1978


Before making decisions about replacing or rehabilitating a pipeline, an assessment of its per formance and condition should be done to establish how well its hydraulic and structural requirements are being met and to estimate its remaining service life. It is generally more cost-effective and far less disruptive to rehabilitate rather than to replace. So when a sewer has corroded, knowing its remaining life and corroded shape will assist with making the decision about which course to take. The output from research to find the appropriate materials for new concrete sewers subject to corrosive conditions has led to a means of predicting the corrosion losses in existing sewers. The corrosion mechanism in concrete sewers is now reasonably well understood, and the Life Factor Method (LFM) for predicting the rate of corrosion for both Portland cement and inert coarse aggregate concretes gives realistic answers.

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