Abstract
This study investigates the incorporation of circulating fluidized bed combustion (CFBC) fly ash as an activator and CFBC bottom ash as fine aggregate in high-volume slag cement mortar. A series of investigations were carried out to analyze the influence of CFBC ash products on the properties of mortar. For comparison, control specimens of ordinary Portland cement and high-volume slag cement were considered. The results obtained from X-ray diffraction and thermogravimetric analyses revealed that the addition of CFBC fly ash activated the hydration of the slag and improved the initial strength of the mortar. Additionally, a pore size distribution test showed that the introduction of CFBC fly ash resulted in decrease of the critical pore diameter and the porosity of the high-volume slag mixes up to 28 days of curing. Similarly, it was found that the compressive strength of high-volume slag mortar manufactured with CFBC fly ash and CFBC bottom ash was improved. Furthermore, the enhanced hydration of high-volume slag mortar due to CFBC ash products resulted in decreased water absorption and fewer total voids. However, inferior resistance to chemical attack was also observed.
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