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Extending the life factor method for predicting sewer corrosion to non-Portland-based cementitious materials – an experimental study

Author(s): Moses W. Kiliswa, Mark G. Alexander and Alaster M. Goyns
Paper category: Proceedings
Book title: Proceedings of the Final Conference of RILEM 253-MCI Microorganisms-Cementitious Materials Interactions Volume I
Editor(s): Alexandra Bertron and Henk Jonkers
ISBN: 978-2-35158-207-7 (Set)
ISBN: 978-2-35158-209-1 (Volume1)
e-ISBN: 978-2-35158-206-0
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 83-95
Total Pages: 288
Language : English

Abstract: Sewer corrosion due to biogenic acid attack is a pervasive problem worldwide. It leads to premature failure and inadequate service life of vulnerable concrete sewers, for which the economic and societal consequences are enormous, considering that these sewers are buried infrastructure. These comments apply equally to many sewers in South Africa, where pioneering research has been done for over three decades using the Virginia Experimental Sewer in the Free State Province.
Starting in the 1980s, various concrete sewer pipe materials were exposed in this full-scale experimental sewer, and monitored for rates of corrosion. More recently, a new research project was undertaken in which cut ‘lids’, forming the crown of concrete pipe sections made from a range of materials, were monitored over a period of several years for deterioration. The experimental results were used to refine and upgrade the Life Factor Method for predicting corrosion in concrete sewers, specifically providing the revised model with the ability to predict corrosion in a range of materials other than those based on Portland cement.
The paper considers the possible extension of this model to other types of cementitious materials such as alkali-activated binders, which are being proposed for use in sewers to counter the effect of biogenic acid attack.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00

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