Nowadays, the enormous amount of generation of construction and demolition waste (CDW) is a major problem, considering its detrimental effects on the environment. In this content, this study focused on the valorization of wastewood fibers in CDW-based geopolymer mortar. Chipped waste-wood fibers (WWFs) (~2.00 mm) were chemically treated by immersing them into alkaline solutions (2.5 M NaOH (Sodium hydroxide) solution) for two hours to reduce inorganic impurities attached to the surface of fibers, in favor of increased compatibility with the geopolymer matrix. Then, treated WWFs were incorporated into the CDW-based mortar mixture activated with NaOH and Ca(OH)₂ (Calcium hydroxide). To assess the effects of fiber inclusion on the rheological properties of CDW-based geopolymer mortar mixture, empirical test methods of flow table, vane shear test, and buildability tests were conducted and rheological tests with an advanced rheometer device were performed by different implementation protocols of flow curve and three interval thixotropy. The results showed that the incorporation of chemically treated WWFs yielded an increment in static and dynamic yield stresses and viscosity of CDW-based geopolymer mortars. Besides that, the inclusion of wood fibers caused increments in the thixotropy performance of mixtures, providing better viscosity recovery performance after the agitation. It is believed that the findings of this study will contribute to the current literature by proposing a different way of producing novel CDW-based geopolymers and valorization of WWFs in construction materials.

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