Abstract
The present work focuses on the investigation of physicochemical characteristics of ancient mortars through the use of static and dynamic methods. Pore structure characteristics of limestone mortars are determined by means of the mercury porosimetry technique. Preliminary results show an average pore size of >900 Å, indicating the major role of macropores in the mortars. A pseudo-first order reaction–diffusion model is developed for investigating the transport and reaction of CO2 on such samples. The model is solved for each isotope of CO2 and the isotopic fractionation is determined as a function of distance from the surface of the mortar. The model's results are fitted to experimental data on carbon isotopic compositions obtained on these mortars. From the optimum fitted parameters, it follows that pore diffusion has a significant effect on the reaction rate of CO2 on the structure of the ancient mortars.
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