Record details

Title
    Cathodoluminescence microscopy and petrographic image analysis of aggregates in concrete pavements affected by alkali-silica reaction
Author
    Leichmann, Jaromír
    Pertold, Zdeněk
    Přikryl, Richard
    Šachlová, Šárka
    Šťastná, Aneta
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Materials Characterization
Vol./nr.
    Roč. 65, č. MARCH
Pages
    11
Year
    2012
Thesaurus term
    ASR
    Cathodoluminescence miscroscopy
    concrete
    petrographic image analysis
Keyword
    Affected
    Aggregates
    Alkali-silica
    Analysis
    Cathodoluminescence
    Concrete
    Image
    Microscopy
    Pavements
    Petrographic
    Reaction
Abstract (in english)
   Various microscopic techniques (cathodoluminescence, polarizing and electron microscopy) were combined with image analysis with the aim to determine a) the modal composition and degradation features within concrete, and b) the petrographic characteristics and the geological types (rocks, and their provenance) of the aggregates. Concrete samples were taken from five different portions of Highway Nos. D1, D11, and DS (the Czech Republic). Coarse and fine aggregates were found to be primarily composed of volcanic, plutonic, metamorphic and sedimentary rocks, as well as of quartz and feldspar aggregates of variable origins. The alkali-silica reaction was observed to be the main degradation mechanism, based upon the presence of microcracks and alkali-silica gels in the concrete. Use of cathodoluminescence enabled the identification of the source materials of the quartz aggregates, based upon their CL characteristics (i.e., color, intensity, microfractures, deformation, and zoning), which is
    difficult to distinguish only employing polarizing and electron microscopy.
Contributor
    UK Praha, Přírodovědecká fakulta
Contributor code
    UK, PřF
Source format
    R
Import date
    27. 4. 2014