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The ancient mortars of the monastery of San Filippo di Fragalà in Frazzanò, the first Basilian-Norman center in Sicily, have been studied and classified by means of ICP, HPLC, TG-DTA, XRD and thin sections analysis. A new very simple method to evaluate the hydraulic properties of the mortars, based on the combination of analytical and thermogravimetric data, is also reported. The HPLC investigations indicate that the monastery is only partially involved in decay phenomena due to the action of soluble salts.

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grains (S) and containing porosity (P). The mortar analysis by XRF exhibited 15.19% CaO, 78.76% SiO 2 , 0.60% Fe 2 O 3 , and 0.37% S. The mortar bulk density was 1.93 g/cm 3 with an apparent porosity of 21.13% and a percentage of pores <1 μ of 68

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