BIOGENIC CORROSION OF CONCRETE SEWER PIPES: A REVIEW OF THE PERFORMANCE OF CEMENTITIOUS MATERIALS
Author(s): Kiliswa, M. W. and Alexander, M. G.
Paper category: Conference
Book title: XIII International Conference on Durability of Building Materials and Components - XIII DBMC
Editor(s): Marco Quattrone, Vanderley M. John
Print ISBN: none
Publication year: 2015
Total Pages: 8
Abstract: The paper reviews the performance of cementitious materials under conditions of biogenic corrosion of concrete sewer pipes. It draws on data from samples analysed in the laboratory and also installed in an experimental sewer in South Africa, as well as data from sewers in France and work from simulation chambers in Germany. Cementitious materials, including supplementary cementitious materials (SCMs), have been used widely in sewer networks to counter different mechanisms of deterioration, with varying success. However, under certain conditions, sewage that is conveyed through outfall sewers becomes septic and hydrogen sulphide gas is generated and biogenically converted to sulphuric acid, which reacts with the acid-soluble components of concrete causing it to corrode. The concrete sewer pipe materials under review comprise those made with Portland Cement and Calcium Aluminate Cement. Results indicate that the formation of alumina gel, as a product of a chemical reaction between the acid and certain cementitious materials, and densification of the concrete matrix, have a significantly positive impact on the rate of deterioration of concrete sewer pipes. The experimental scope of a related current research project is previewed, focusing on the expected outcomes.
Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00