Dry Mix Slag—High-Calcium Fly Ash Binder. Part Two: Durability

Abstract

This work investigates durability of cement-free mortars with a binder comprised of ground granulated blast furnace slag (GGBFS) activated by highcalcium fly ash (HCFA) and sodium carbonate (Na 2 CO 3 ): the soundness, sulfate resistance, alkali-silica reactivity and efflorescence factors are considered. Results of tests show that such mortars are resistant to alkali-silica expansion. Mortars are also sulfate-resistant when the amount of HCFA in the complex binder is within a limit of 10 wt%. The fineness of fly ash determines its' ability to activate GGBFS hydration, and influence soundness of the binder, early strength development, sulfate resistance and efflorescence behavior. The present article is a continuation of authors ' work, previously published in MSA, Vol. 14,[240][241][242][243][244][245][246][247][248][249][250][251][252][253][254]