Microbially-induced Concrete Corrosion - A worldwide problem
Author(s): Grengg, C., Kiliswa, M., Mittermayr, F., Alexander, M.
Paper category: Conference
Book Title: International RILEM Conference on Microorganisms-Cementitious Materials Interactions
Editors: Virginie Wiktor, Henk Jonkers, Alexandra Bertron
Publisher: RILEM Publications SARL
Publication year: 2016
Total Pages: 19
Abstract: Concrete degradation due to microbially-induced acid attack in sewer systems is a frequently observed issue worldwide. Remediation and repair of sewer systems subjected to microbiallyinduced concrete corrosion (MICC) is complex and of high economic relevance. Numerous field campaigns and in-situ experiments are continuously being conducted in such aggressive environments in order to understand the underlying reaction mechanisms, environmental controls and material related aspects, with the view of reducing concrete corrosion rates in such systems. This study aims to summarize existing literature on field observations and in-situ tests, in order to compare and discuss MICC initiation and propagation regarding different material and environmental settings. Therefore, decisive parameters measured in various field and laboratory campaigns including (i) temperature, (ii) concentrations of gaseous H2S, CH4 and CO2, (iii) chemical and mineralogical composition of solids, (iv) pH, alkalinity, chemical composition of the solutions, and (v) microbiological analyses, are compared. Additionally, certain aspects steering MICC, such as environmental parameters, material aspects and microbiology involved were reviewed in line with findings from both field observations and in-situ tests. Speciation of standard regulations, related to material guidelines, and their control on concrete durabilities in MICC environments are discussed, together with engineering aspects and sewer designs. Conflating all those aspects contribute towards a deeper understanding regarding the process mechanisms and corrosion propagation, promoting advances in concrete durabilities and service life predictions of affected sewer systems.
Online publication: 2016
Publication Type: full_text
Public price (Euros): 0.00