*Review* **The Present State of the Use of Waste Wood Ash as an Eco-Efficient Construction Material: A Review**

**Rebeca Martínez-García <sup>1</sup> , P. Jagadesh <sup>2</sup> , Osama Zaid 3,\* , Adrian A. S, erbănoiu <sup>4</sup> , Fernando J. Fraile-Fernández <sup>1</sup> , Jesús de Prado-Gil 1, Shaker M. A. Qaidi <sup>5</sup> and Cătălina M. Grădinaru <sup>4</sup>**


**Abstract:** A main global challenge is finding an alternative material for cement, which is a major source of pollution to the environment because it emits greenhouse gases. Investigators play a significant role in global waste disposal by developing appropriate methods for its effective utilization. Geopolymers are one of the best options for reusing all industrial wastes containing aluminosilicate and the best alternative materials for concrete applications. Waste wood ash (WWA) is used with other waste materials in geopolymer production and is found in pulp and paper, wood-burning industrial facilities, and wood-fired plants. On the other hand, the WWA manufacturing industry necessitates the acquisition of large tracts of land in rural areas, while some industries use incinerators to burn wood waste, which contributes to air pollution, a significant environmental problem. This review paper offers a comprehensive review of the current utilization of WWA with the partial replacement with other mineral materials, such as fly ash, as a base for geopolymer concrete and mortar production. A review of the usage of waste wood ash in the construction sector is offered, and development tendencies are assessed about mechanical, durability, and microstructural characteristics. The impacts of waste wood ash as a pozzolanic base for eco-concreting usages are summarized. According to the findings, incorporating WWA into concrete is useful to sustainable progress and waste reduction as the WWA mostly behaves as a filler in filling action and moderate amounts of WWA offer a fairly higher compressive strength to concrete. A detail study on the source of WWA on concrete mineralogy and properties must be performed to fill the potential research gap.

**Keywords:** geopolymer concrete; waste wood ash; environmental impact mechanical properties; durability
