Avanços na reciclagem e gestão de resíduos

Prolonged Effects of Concrete Containing Fly Ash from Wood Biomass

Abstract

Junbeum Kim*

In the wood biomass is frequently utilised as a fuel to produce heat and power, producing a sizable amount of ash in the process. In order to properly dispose of ash, especially in its finest fraction, specialised engineering solutions are needed because ash particles contain heavy metals and can readily damage land, groundwater, or air. In this work, concrete with a 15% and 30% cement replacement, respectively, was made using wood fly ash with high pozzolanic oxide content and one with a high CaO content. Due to the low stiffness of the wood ash particles, the introduction of wood ash into concrete decreased the 28-day compressive strength by up to 37%; however, the 2-year compressive strength revealed very little pozzolanic reactivity.