Petrography of historic mortar materials: polarising light microscopy as a method for characterising lime-based mortars

Kristin Balksten, Bo Nitz, John J. Hughes, Jan-Erik Lindqvist

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    Abstract

    In studying historic, repair and restoration mortars comprised of lime-based material there is an analytical method that answers more questions than any other; transmitted (and reflected) polarised light microscopy (PLM). The present study is based on thin-section analysis of historic and restoration mortars made by the authors in Sweden and Scotland since the 1980’s, previous research [1, 2, 3, 4] and petrographic atlases [5, 6, 7, 8]. This paper is written to be a pedagogically useful complement to previous work.

    We present a selection of microphotographs to show the variety of questions that the method can give answers to, such as, in the study of:
    -lime binder; source materials, hydraulicity, slaking methods, lime lumps, cracking characteristics
    -aggregates; grading, mineralogy/lithology and texture
    -additives; inorganic puzzolanic materials and organic materials
    -paint layers; different binders, pigments, thicknesses
    -pore structure; durability, vapour transport and capillarity
    -craftsmanship; various application and working techniques

    The aim of this paper is to contribute with more illustrations of reference materials and to illustrate the usefulness of Polarising Light Microscopy as a method for characterising lime-based mortars and to review the most significant analyses parameters.
    Original languageEnglish
    Title of host publicationProceedings of the 5th Historic Mortars Conference
    Subtitle of host publicationRILEM Proceedings PRO 130
    EditorsJose Ignacio Alvarez, Jose Maria Fernandez, Inigo Navarro , Adrian Duran, Rafael Sirera
    Place of PublicationParis
    PublisherRILEM Publications S.A.R.L.
    Pages453-467
    Number of pages15
    VolumePRO 130
    ISBN (Electronic)9782351582220
    ISBN (Print)9782351582213
    Publication statusPublished - 16 Jul 2019
    Event5th Historic Mortars Conference 2019 - Universidad de Navarra, Pamplona, Spain
    Duration: 19 Jun 201921 Jun 2019
    Conference number: 5
    https://www.unav.edu/en/web/historic-mortars-conference

    Publication series

    NameRILEM Proceedings
    PublisherRILEM Publications S.A.R.L.
    Volume130

    Conference

    Conference5th Historic Mortars Conference 2019
    Abbreviated titleHMC 2019
    Country/TerritorySpain
    CityPamplona
    Period19/06/1921/06/19
    Internet address

    Keywords

    • Historic Mortar
    • petrography

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