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  • Early-age elasticity in structuration of highly cohesive concrete with added pozzolanic diatomaceous earth [Elektronski vir]
    Brunčič, Ana, 1983- ; Šter, Katarina, 1987- ; Dolenec, Sabina
    The paper presents part of the results of the wider context research on effect of diatomaceous earth (DE) of various origins as a cement thixotropy and elasticity enhancer in concretes with ... pronounced cohesion. DE has long been recognized and used as an amorphous silica-based pozzolanic supplementary cementitious material (SCM), which, like silica fume, improves concrete performance, foremost cohesion and thixotropy in fresh state and strength in hardened state. Research was performed on cement paste. Calcined diatomaceous earth was used along with cement CEM I 52.5. Five different mixtures were prepared with DE used at a replacement rate ranging from 0 to 12 wt.% of ordinary Portland cement (OPC) and 0.5 water-to-binder ratio. Reactivity of cementitious systems and hydration kinetics were investigated with isothermal calorimetry, and rheological characterisation performed with rotational shear for flowability and thixotropy evaluation, and small amplitude oscillatory shear (SAOS) for elasticity evaluation. Flow curve and SAOS showed the greatest effect of diatomaceous earth used as SCM in terms of suspensions elasticity and adequate flowability at 6 wt.%, both test methods indicated instable mechanical performance of mixture with higher shares od added DE, probably caused by uneven leaching of water from pores of DE.
    Source: Congress proceeding [Elektronski vir] : Further Reduction of CO2 -Emissions and Circularity in the Cement and Concrete Industry : ICCC 2023, 16th International Congress on the Chemistry of Cement 2023, September 18–22, 2023, Bangkok. Vol. 3 (Str. 85-88)
    Type of material - conference contribution ; adult, serious
    Publish date - 2023
    Language - english
    COBISS.SI-ID - 178246403

    Link(s):

    https://www.iccc-online.org/fileadmin/gruppen/iccc/proceedings/ICCC16_2023_Vol_III.pdf

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