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The behavior of two series of concrete slabs exposed to sulfate-bearing soils was investigated by a numerical model called STADIUM. In addition to the diffusion of ions and moisture, the model also accounts for the effects of dissolution/precipitation reactions on the transport mechanisms. The simulations yielded by the model were compared to the actual degradation of the slabs after 8 years of exposure. The microstructural alterations of concrete resulting from the penetration of magnesium, chloride and sulfate ions were studied by backscatter mode scanning electron microscope observations and energy-dispersive X-ray analyses. The comparison of both series of data indicates that the model can reliably predict the various features of the microstrucrural alterations of concrete. R SUM Le comportement de deux sdries de &lles sur sol en bdton expose'es h des sols chimiquement agressifs a dtd dtudid ~ l'aide d'un code de calcul numdrique appeld STA-DIUM. Ce modHe permet de ddcrire le transport coupld de l'eau et des ions clans des matdriaux poreux non-saturds en prenant en consid&ation l'influence des rdactions chimiques. Les rdsultats des simulations numdriques ont dtd systdmatiquement compards ?t des observations de la ddgradation du bdton aprks huit ans d'exposition h des ions

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