Comparison between NMR and MIP in characterizing porosity of limestone used in Cultural Heritage

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Limestone with different porosity are used extensively as a sculptural and architectural stone in artistic-architectural field. As it isknown, this kind of material is subjected to physico-chemical decay that involves the loss of surface and in-depth cohesion [1].Consolidation interventions are performed in order to preserve building and decorative surfaces of architectural monuments, toreduce their degradation rate and to improve cohesion and adhesion in the stone [2].Porosity of stone and pore size distribution are important factors to evaluate the effectiveness of a consolidation treatment andthey are normally performed using a single technique such as mercury intrusion porosimetry, MIP [3].Unfortunately, theinstrumental limitations of this technique such as the assumptions on pore geometry lead to incomplete, sometimes deceptiveresults if used alone. Moreover, it leads to the destruction of the analyzed material and to the impossibility to test the same sampleafter a consolidation treatment.Nuclear Magnetic Resonance (NMR) relaxometry of water 1H nuclei can be also exploited to investigate pore space structure inhigh surface-to-volume ratio (S/V) systems (characterized by small pore size). NMR relaxation times of confined water depend onproperties of the porous medium such as S/V and pore size distribution. Furthermore, in the last years portable devices for NMRrelaxometry have been developed for in situ, non-destructive and non-invasive measurements consequently theseinstrumentations are able to analyze pore distribution before and after consolidation treatment [4].In this experimental investigation results from NMR relaxometry and mercury intrusion porosimetry are compared with the aim atstudying various type of limestone materials with different porosity. The performances of the two technique are compared andresults are discussed. This analysis is preliminary for any investigation of the effectiveness of consolidation treatment.
Lingua originaleEnglish
Numero di pagine2
Stato di pubblicazionePublished - 2015


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