Macroscopic corrosion front computations of sulfate attack in sewer pipes based on a micro-macro reaction-diffusion model

V. Chalupecky, T. Fatima, A. Muntean, J. Kruschwitz

Onderzoeksoutput: Boek/rapportRapportAcademic

29 Downloads (Pure)

Samenvatting

We consider a two-scale reaction diffusion system able to capture the corrosion of concrete with sulfates. Our aim here is to define and compute two macroscopic corrosion indicators: typical pH drop and gypsum profiles. Mathematically, the system is coupled, endowed with micro-macro transmission conditions, and posed on two different spatially-separated scales: one microscopic (pore scale) and one macroscopic (sewer pipe scale). We use a logarithmic expression to compute values of pH from the volume averaged concentration of sulfuric acid which is obtained by resolving numerically the two-scale system (microscopic equations with direct feedback with the macroscopic diffusion of one of the reactants). Furthermore, we also evaluate the content of the main sulfatation reaction (corrosion) product –the gypsum– and point out numerically a persistent kink in gypsum's concentration profile. Finally, we illustrate numerically the position of the free boundary separating corroded from not-yet-corroded regions.
Originele taal-2Engels
Plaats van productieEindhoven
UitgeverijTechnische Universiteit Eindhoven
Aantal pagina's10
StatusGepubliceerd - 2012

Publicatie series

NaamCASA-report
Volume1201
ISSN van geprinte versie0926-4507

Vingerafdruk Duik in de onderzoeksthema's van 'Macroscopic corrosion front computations of sulfate attack in sewer pipes based on a micro-macro reaction-diffusion model'. Samen vormen ze een unieke vingerafdruk.

Citeer dit