Biodeterioration mechanisms and kinetics of SCM and aluminate based cements and AAM in the liquid phase of an anaerobic digestion system

Author(s): M. Giroudon, M. Peyre Lavigne, C. Patapy and A. Bertron
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: 231-241
Total Pages: 288
Language : English

Abstract: In biogas structures, concrete faces aggressive media during the anaerobic digestion. Biological activities allow the conversion of organic matter into biogas, leading to a medium characterized by a variability of composition in time and space. In order to ensure the sustainability of this industry, solutions for increasing the concrete durability are needed. This study aims to analyze the deterioration mechanisms of different binders and the impact of the binder nature on the medium biochemical composition during the digestion. Binders with favorable composition to chemically aggressive media were tested: slag cement (CEM III/B), aluminate cement (CAC) and metakaolin-based alkali-activated material (MKAA), and a reference binder: OPC (CEM I). They were exposed to two anaerobic digestion cycles in liquid phase in laboratory bioreactors. The organic acids’ and ammonium concentrations of the liquid phase were monitored by GC and HPIC. For OPC and slag cement pastes, the chemical and mineralogical changes were characterized by SEM/EDS and XRD. A maximal concentration of acids was reached in all bioreactors (from 0.20 to 0.35 g.L-1) except those containing MKAA where the concentration continued to increase. Ammonium concentrations were above the XA3 class range. Under the conditions explored, biodeterioration mainly led to the carbonation of cement pastes.

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

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