VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Influence of mineral binder type on alkali carbonate reaction [Elektronski vir]
    Štukovnik, Petra, 1984- ; Marinšek, Marjan, kemijski inženir ; Bokan-Bosiljkov, Violeta
    The paper presents and discusses the process of alkali-carbonate reaction (ACR) in mortar, between dolostone aggregate grains and three different mineral binders: cement, hydrated lime, and ... combination of lime and tuff. The mortar bars were prepared from typical Slovenian late digenetic dolostone acting as aggregate. As binder, Portland cement CEM I, according to the European standard EN 197-1, was used for the first set of specimens, pure calcite lime putty was used for the second set of specimens, and combination of the lime putty and zeolite tuff was used for the third set of specimens. The specimens were exposed to accelerated conditions regarding the ACR, simulated by distilled water at 60 °C. The progress of ACR was studied using a petrographic microscope and scanning electron microscopy with X-ray microanalysis (SEM/EDS) after 3 and 6 months, and after 2 years. Compressive tests were also carried out parallel to the microscopic investigation. The results obtained at microstructural level show that ACR is progressive with time for all three binders studied. It reflects in the process of aggregate grains dedolomitization and the formation of secondary calcite in binder. However, extent of the microstructure change is not the same for all binders. Recrystallization that reflects in reaction rings, dedolomitization along preexisting cracks and so called paving structure, and in formation of secondary calcite, is faster for the cement binder. In case of specimens with the lime-tuff binder also a new reaction product rich in Mg and Si atoms was formed at the edge of the dedolomitized parts of the grains. The compressive strength of the mortar bars increased with time up to 2 years of the accelerated exposure for all studied binders, in great extent due to the observed change of the mortars microstructure.
    Vir: XIV DBMC - 14th International conference on durability of building materials and components [Elektronski vir] : 29-31 May 2017, Ghent University, Belgium (Str. 1-8)
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2017
    Jezik - angleški
    COBISS.SI-ID - 8088673

    Povezava(-e):

    https://www.ugent.be/ea/structural-engineering/en/dbmc2017
    https://www.ugent.be/ea/structural-engineering/en/dbmc2017/invpresentation/vb.htm

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