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The restoration works undertaken in the archaeological site of Chellah in the Sixties used cement for the consolidation of the Roman structures undercovered. They're mainly consisting of calcareous rocks, which density, porosity, and hardness are lower then cement, and they're clearely weakened. Indeed, the capillary increase to which are subjected the structures allowed to convey salts whose advance is blocked by the introduced cement mortar. Trapped in the calcareous rock, the salts contribute to the acceleration of its degradation.

Cement Mortar Restorations and Disorders in the Archaeological Site of Chellah