Alkali-activated cement based on natural SiO2-containing material: Part I. Strength, hydration, microstructure and durability

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    9 Scopus citations

    Abstract

    An alkali-activated cement (AAC) based on natural SiO 2-containing materials - grounded porcellanite (Pr) and highly dispersed pure quartz sand - was examined. Sodium hydroxide was used as an alkali activator. The pressed specimens were prepared and were cured in an autoclave at a pressure of 1.6 MPa and a temperature of 205 °C. It was shown that the strength of cement as well as compound and the microstructure of its hydration products depend on the cement composition. It was distinguished that autoclave-cured cementing matter comprises secondary quartz and the mass of sodium hydrated silicates along with the initial Pr crystal phases. After a 2-year storage under water, 15% Na2SO4, and Dead Sea water, the strength of specimens decreased by 17.5-20%. Control specimens, prepared with Portland cement and immersed in a 15% Na2SO 4 solution for 2 weeks, were broken up completely. Positive results of long-term durable tests suggest that an AAC based on natural raw material would be stable in other salt solutions.

    Original languageEnglish
    Pages (from-to)1417-1422
    Number of pages6
    JournalCement and Concrete Research
    Volume33
    Issue number9
    DOIs
    StatePublished - 1 Sep 2003

    Keywords

    • Alkali-activated cement
    • Durability
    • Hydration product
    • Mechanical properties

    ASJC Scopus subject areas

    • Building and Construction
    • General Materials Science

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