Influence of using wood biomass fly ash as filler on the rheological and physical properties of cementitious pastes

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Abstract

The increasing consumption of biomass by the energy sector is generating a substantial rise in biomass fly ash (BFA). This experimental research explores the use of biomass fly ash as a substitute for limestone filler (LF) in cement-based materials. The study proposes a new recovery pathway for these industrial waste products and addresses the issue of overexploitation of traditional mineral resources. In the research, BFA was first characterized through physicochemical analyses and compared to limestone filler to identify the similarities between the two materials. Subsequent tests were carried out on ordinary cement CEM I pastes and composite cement CEM III pastes, gradually replacing limestone filler with BFA in volumetric proportions from 0 to 100%. The results indicate that BFA incorporation reduces flowability, due to increased water demand, and modifies the rheological properties by increasing yield stress and viscosity. In the hardened state, BFA maintains the mechanical properties of the pastes relative to those formulated with limestone filler, while having a minor effect on the physical properties. This study demonstrates that BFA has real potential as a filler in fluid eco-friendly cementitious materials. • Incorporating biomass fly ash produced an increase in viscosity and yield stress. • The use of wood biomass fly ash as filler does not affect the production of hydrates. • Wood biomass fly ash demonstrates equivalent mechanical performances when used as a complete substitute for limestone filler. • The use of wood biomass fly ash as a filler in cement-based materials raises no contraindications.

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