From Portland cement to alkali-activated system: advances in wood-cement composites for sustainable building applications

This paper presents a detailed review of wood-cement composites, focusing on their material characteristics, mechanical performance, and evolution as a class of sustainable and cleaner construction material. Formed by combining wood particles with cementitious binders, these composites offer a unique alternative to conventional building materials by utilising renewable resources, supporting cleaner production practices, and reducing embodied carbon. The review is based on an extensive compilation of experimental data drawn from the literature, covering a wide range of studies that examine the effects of wood species, binder types, fabrication methods, and testing protocols on composite performance. Particular attention is given to the influence of binder composition, wood particle size, and mix ratios on key mechanical properties, including compressive strength, flexural strength, density, and toughness. These parameters are critically assessed to establish their role in governing the structural reliability and functional suitability of the composites. The review also addresses production techniques and standardised testing methods, identifying common challenges such as the chemical incompatibility between lignocellulosic materials and cement hydrates, and summarising approaches developed to mitigate these issues. Recent developments, including the use of alkali-activated binders, are examined for their potential to enhance material performance and support cleaner material development. By consolidating existing research and identifying gaps in current knowledge, this paper aims to support further technical advancement and inform the practical implementation of wood-cement composites in environmentally responsible construction.