Environmental impact assessment of wood bio-concretes: Evaluation of the influence of different supplementary cementitious materials

•Environmental impacts of wood bio-concretes (WBC) are evaluated.•Fly ash and metakaolin are used as SCM for Portland cement replacement.•The increase of SCM and wood shavings content reduces the WBC environmental impacts.•WBC mixtures with low climate change impact are presented.•The fuel used for the kaolin calcination has an important influence on WBC environmental impacts. This study evaluates the environmental impacts of workable wood bio-concretes (WBC). The WBC is composed of wood shavings, Portland cement (CEM), and two Supplementary Cementitious Materials (SCMs): metakaolin (MK) and fly ash (FA). A Life Cycle Assessment (LCA) was performed on seven WBC mixtures containing different contents of SCMs. When the compressive strength was used as a functional unit, the mixture containing 40% MK and 10% FA achieved the lowest values in most impact categories. We concluded that the CEM replacement by SCMs is a promising strategy to reduce the environmental impacts of the WBC, especially the climate change impact.