Abstract
This paper illustrates the result of a study on the influence of circulating fluidized bed combustion (CFBC) fly ash, sodium hydroxide (NaOH), sodium silicate (Na2SiO3), sodium phosphate (Na3PO4), and sodium carbonate (Na2CO3) as activators on the workability, bleeding, setting time, compressive strength, shrinking, and absorption of the alkali-activated slag (AAS) cement mortars. The addition of CFBC fly ash, Na3PO4, and Na2CO3 shows decrease of workability. But with Na2SiO3, the workability increase was observed. The setting time of Na3PO4, NaOH, Na2SiO3, and Na2CO3 activated slag cement mortars was found to be much faster than the setting time of slag cement mortars. Slag cement mortars activated with CFBC fly ash show similar strength properties to slag cement mortars. CFBC fly ash activated slag cement mortars gained higher early compressive strength and developed 50MPa compressive strength at the age of 56 days. CFBC fly ash activated slag cement mortars were found providing higher compressive strength than other activated slag cement mortars.
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