Understanding the Microstructure of Mortars for Cultural Heritage Using X-ray CT and MIP

Materials

Tim De Kock¹  Antonio Sansonetti²  Cristina Tedeschi³  Veerle Cnudde⁴  Carmen Canevali⁵  Valentina Brunello⁶  Sandro Recchia⁶  Laura Rampazzi⁷  Cristina Corti⁷ 

[1] ARCHES (Antwerp Cultural Heritage Sciences), Faculty of Design Sciences, University of Antwerp, Mutsaardstraat 31, 2000 Antwerp, Belgium;Centro Speciale di Scienze e Simbolica dei Beni Culturali, Università degli Studi dell’Insubria, via Valleggio 9, 22100 Como, Italy;Department of Civil and Environmental Engineering (DICA), Politecnico of Milan, Piazza Leonardo da Vinci 32, 20133 Milan, Italy;Department of Geology, Pore-Scale Processes in Geomaterials Research (PProGRess)—UGCT, Ghent University, Krijgslaan 281/S8, 9000 Ghent, Belgium;Department of Materials Science, University of Milano-Bicocca, via Roberto Cozzi 55, 20125 Milan, Italy;Dipartimento di Scienza e Alta Tecnologia (DiSAT), Università degli Studi dell’Insubria, via Valleggio 9, 22100 Como, Italy;Dipartimento di Scienze Umane e dell’Innovazione per il Territorio (DiSUIT), Università degli Studi dell’Insubria, via Sant’Abbondio, 12, 22100 Como, Italy;

关键词: cement;    stone conservation;    3D visualization;    µCT;    MIP;    mortar;   

DOI  :  10.3390/ma14205939

来源: DOAJ

【 摘 要 】

In this study, the microstructure of mock-up mortar specimens for a historic environment, composed of different mixtures, was studied using mercury intrusion porosity (MIP) and microcomputed tomography (µCT), highlighting the advantages and drawbacks of both techniques. Porosity, sphericity, and pores size distribution were studied, evaluating changes according to mortar composition (aerial and hydraulic binders, quartz sand, and crushed limestone aggregate). The µCT results were rendered using 3D visualization software, which provides complementary information for the interpretation of the data obtained using 3D data-analysis software. Moreover, µCT contributes to the interpretation of MIP results of mortars. On the other hand, MIP showed significant ink-bottle effects in lime and cement mortars samples that should be taken into account when interpreting the results. Moreover, the MIP results highlighted how gypsum mortar samples display a porosity distribution that is best studied using this technique. This multi-analytical approach provides important insights into the interpretation of the porosimetric data obtained. This is crucial in the characterization of mortars and provides key information for the study of building materials and cultural heritage conservation.

【 授权许可】

Unknown