Junbeum Kim*
Wood biomass is widely used as a fuel in the European Union to generate heat and electricity, resulting in a significant amount of ash. Because ash particles contain heavy metals and can easily pollute soil, groundwater, or air, proper engineering solutions are required for ash disposal, particularly in its finest fraction. In this study, wood fly ash with a high pozzolanic oxide content and one with a high CaO content were used in concrete as a 15% and 30% cement replacement, respectively. Wood ash incorporation in concrete reduced the 28-day compressive strength by up to 37%, which was attributed to the low stiffness of the wood ash particles, whereas the 2-year compressive strength indicated very low pozzolanic reactivity.
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