Abstract
Particle-size analysis on ancient mortars and concretes aggregate is today a common practice in Cultural Heritage and civil engineering. Normally, a particle-size distribution of mortar aggregates on in situ materials is carried out using sieves, following the dissolution of the carbonate binder. This technique needs about 200 g of material per sample and produces a large volume of liquid wastes. Sampling is generally supervised by local authorities especially in the field of cultural heritage. Over the years it has therefore become necessary to devise analytical solutions for collecting the smallest volume of material to preserve the buildings. In this research a non-destructive testing to define the aggregate distribution and their percentage in the mortars and/or concretes is presented. It consists of 2D particle size image analysis performed in thin sections. To evaluate the reliability and limitations of this method, already operated in other research, 20 particle-size distributions, characterized by aggregates with Roundness 0.5 < R < 0.95 and Circularity 0.4 < C < 0.75 were created and analyzed using real sieves. Afterwards, the same particle-distributions were mixed with resin to reproduce a “fake” concrete/mortar. A thin section of this latter was analyzed by appropriate software. The method shows a good prediction of the Resin/Aggregate ratio with uniformity coefficient of 0.88 together with variable reliability of the particle-size distribution.
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Funding
The authors gratefully acknowledge the following funding sources: INOVSTONE4.0 (POCI-01-0247-FEDER-024535), co-financed by the European Union through the European Regional Development Fund (FEDER) and Fundação para a Ciência e Tecnologia (FCT) under the project UID/Multi/04449/2013 (POCI-01-0145-FEDER-007649). Fabio Sitzia gratefully acknowledge the Recursos Humanos Altamente Qualificados (University of Evora) for the contract with Ref. ALT2059-2019-24.
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FS: conceptualization, data curation, formal analysis, investigation, project administration, resources, software, supervision, methodology, validation, visualization, writing—original draft, writing—review and editing. MB: methodology, validation, visualization, writing—review and editing. JM: funding acquisition, validation, visualization, writing—review and editing.
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Sitzia, F., Beltrame, M. & Mirão, J. The particle-size distribution of concrete and mortar aggregates by image analysis. J Build Rehabil 7, 74 (2022). https://doi.org/10.1007/s41024-022-00214-w
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DOI: https://doi.org/10.1007/s41024-022-00214-w