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Μελέτη δυνατοτήτων φορητού συστήματος φθορισμομετρίας ακτίνων-X (ED-XRF) καθώς και φασματομετρίας υπερύθρων (FT-IR), για την ανάλυση κονιαμάτων και λίθων μνημειακών κατασκευών

Kyrimi Evaggelia

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Summary

The goal of the analysis of mortars and stones is not only the gathering of data related to mortar construction technology but also the identification of the mineralogical characteristics of stones, in order to acquire the ability to composite compatible mortars and replace stones for monument conservation and restoration. A common problem during this procedure is that the samples need to be destroyed and transferred to the laboratory in order to be analyzed. In this thesis the X-ray fluorescence (XRF) method has been particularly examined as it constitutes a non-destructive method of analysis which can be applied in situ, given the right equipment. Stone and mortar samples from various monuments and periods have been collected, so the results would reflect a vast range of cases, while a comparison with other methods was carried out as well.For the elemental analysis of unknown samples using the XRF method the following were used: two types of standards, fabricated samples with known ratio in the laboratory and certified samples by NIST and IAEA. Based on the absorption of every chemical element, including the standards and the unknown samples, we decided on a semi-quantitative approach for the monument samples. In addition, enhancement assays for the absorption of low-energy elements were conducted. The results from the XRF method were compared with the ones from infrared spectroscopy, X-ray diffractometry, thermal analysis and measurement of calcium carbonate. Hence, the aforementioned measurements and results lead to various conclusions and suggestions for the enhancement of the methods and techniques.

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