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Pro091

MODELLING OF H2S ATTACK OF CONCRETE IN SEWER PIPES



Author(s): Haifeng Yuan, Patrick Dangla, Huisu Chen, Patrice Chatellier and Thierry Chaussadent
Book Title: RILEM International Symposium on Concrete Modelling - CONMOD 2014
Editor: Kefei Li, Peiyu Yan and Rongwei Yang
ISBN: 978-2-35158-139-1
e-ISBN: 978-2-35158-140-7
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 424-430
Total Pages: 7
Language: English


Abstract: Biodeterioration of concrete, which is very common in sewer system, results in significant structure degradation. Biodeterioration is caused by sulfur oxidizing bacteria (SOB) which grow on concrete surface. However, SOB will not start to active until pH is less than 9. Therefore, the primary stage of biodeterioration is the neutralization process of concrete by H2S gas which can be found in sewer pipes. A reactive transport model is proposed to simulate the H2S attack of concrete in sewer pipes. The absorption of H2S gas, the dissolution of portlandite (CH), the decalcification of calcium silicate hydrates (C-S-H) and the precipitation of calcium sulfide (CaS) are considered in this study. The solid composition evolution during H2S attack and an initial lag period before the start of active corrosion can be obtained. A laboratory experiment reported in literature is simulated and the simulation results are compared with experimental results.


Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00