The prevailing approach of total clearing to contain the spread of invasive plants (IP) in South Africa is generating enormous lignocellulosic wastes. This study examined the possibility of utilizing these wastes in the production of geopolymer composites for use in outdoor environments. Untreated wood particles from Acacia mearnsii and A. longifolia, as well as sugarcane bagasse residues, were incorporated into a geopolymer matrix developed from a binary precursor system of 75% fly ash and 25% metakaolin. The variables considered included precursor-activator ratio (PA), curing pattern (CP), lignocellulosic material (LM), and alkali concentration (Mcon). The production process was established using a mixed factorial experimental design. PA and CP were considered at 2 levels, while LM and MCon were considered at 3 levels. The density of the boards exceeded 1 g cm⁻³ and are classified as high-density boards. The boards have comparable sorption properties to the cement-bonded particleboard according to the EN 632-2: 2007 standard. However, only A. longifolia boards produced with 12 M NaOH and PA ratio of 2:1 met the mechanical strength requirements. Thermogravimetric analysis revealed that the boards are thermally stable. These results have shown that South African woody IPs are suitable for geopolymer wood composites, but there is still concern about their durability in the alkaline matrix. Scanning electron microscopy micrographs indicated mineralization of the particles and a partial degradation of hemicellulose was confirmed by Fourier transform infrared spectroscopy. Although the degraded components did not prevent geopolymer setting, there is need to further investigate the extent and means of preventing degradation as this can derail the intended use of the product.

遏制外来入侵植物（IP）在南非蔓延的全面清除的流行方法正在产生大量的木质纤维素废物。这项研究检验了在生产用于室外环境的地聚合物复合材料中利用这些废物的可能性。未经处理的木相思木和长叶相思木颗粒以及甘蔗渣的残渣，被掺入到由75％粉煤灰和25％偏高岭土的二元前体体系开发的地聚合物基质中。考虑的变量包括前体-活化剂比率（PA），固化方式（CP），木质纤维素材料（LM）和碱浓度（Mcon）。使用混合因子实验设计建立了生产过程。PA和CP被认为是2个级别，而LM和MCon被认为是3个级别。板的密度超过1 g cm ^-3，被分类为高密度板。根据EN 632-2：2007标准，该板具有与水泥粘合刨花板相当的吸附性能。但是，只有A. longifolia用12 M NaOH和2：1的PA比例生产的纸板满足机械强度要求。热重分析表明，这些板是热稳定的。这些结果表明，南非木质IPs适用于地聚合物木质复合材料，但仍需关注其在碱性基质中的耐久性。扫描电子显微镜显微照片表明颗粒的矿化，并且通过傅立叶变换红外光谱法确认了半纤维素的部分降解。尽管降解的成分不能防止地质聚合物的凝结，但仍需要进一步研究防止降解的程度和方法，因为这可能会使产品的预期用途脱轨。