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We consider a two-scale reaction diffusion system able to capture thecorrosion of concrete with sulfates. Our aim here is to define and compute twomacroscopic corrosion indicators: typical pH drop and gypsum profiles.Mathematically, the system is coupled, endowed with micro-macro transmissionconditions, and posed on two different spatially-separated scales: onemicroscopic (pore scale) and one macroscopic (sewer pipe scale). We use alogarithmic expression to compute values of pH from the volume averagedconcentration of sulfuric acid which is obtained by resolving numerically thetwo-scale system (microscopic equations with direct feedback with themacroscopic diffusion of one of the reactants). Furthermore, we also evaluatethe content of the main sulfatation reaction (corrosion) product---thegypsum---and point out numerically a persistent kink in gypsum's concentrationprofile. Finally, we illustrate numerically the position of the free boundaryseparating corroded from not-yet-corroded regions.

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