Hydration of roman cements used for architectural restoration

Abstract eng:
Roman cement was extensively used to decorate facades during the nineteenth and beginning of twentieth Century. The interest of this material has been revisited recently in the field of conservation of architectural cultural heritage. This article gives preliminary results on the characterization of the raw materials and main reactive phases (using XRD, SEM, selective dissolution and isothermal calorimetry) of a roman cement recently produced from the Lilienfeld marlstone (Austria), in comparison with a commercial roman cement (from Vicat, France). The mineralogical composition of the two cements strongly differs according to the presence of sulphate minerals in the marlstone and the temperature of calcination. Isothermal calorimetry and in-situ XRD carried out on cement paste allow the identification of the AFm and AFt type phases as early age hydration products responsible of the flash setting typical to roman cements. The composition rich in alumina and the crystallinity of dicalcium silicates strongly differs in the Lilienfeld cement and influence their reactivity at the later ages.

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