In the realm of sustainable construction materials, this study delves into the feasibility of utilizing wood-derived biochar as a partial substitute for sand in mortar. Carbon mineralisation potential of mortar increases due to the presence of biochar. Inclusion of biochar leads to improved thermal performance, manifested through reduced thermal conductivity, and increased specific heat capacity. Water vapour resistance factor also benefits from biochar, peaking at a 15 % mixture. However, it is essential to acknowledge that these hygrothermal and carbon sequestration advantages comes at a cost: higher biochar contents lead to reduced strength, increased drying shrinkage and reduced sulphate resistance. The primary focus of this research lies in striking a balance between hygrothermal performance and environmental performance, particularly for indoor building applications. Furthermore, this research underscores the necessity of tailoring biochar-cementitious composite materials to their intended application context, capitalizing on their inherent strengths while mitigating potential weaknesses.

中文翻译：

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碳封存生物炭掺入水泥基复合材料：湿热、机械和耐久性特性评估


在可持续建筑材料领域，本研究深入探讨了利用木材衍生生物炭作为砂浆中沙子的部分替代品的可行性。由于生物炭的存在，砂浆的碳矿化潜力增加。加入生物炭可以提高热性能，这表现为降低导热系数和增加比热容。抗水蒸气系数也受益于生物炭，峰值为 15% 的混合物。然而，必须承认这些湿热和碳封存优势是有代价的：较高的生物炭含量会导致强度降低、干燥收缩增加和硫酸盐耐受性降低。这项研究的主要重点在于在湿热性能和环境性能之间取得平衡，特别是对于室内建筑应用。此外，这项研究强调了根据其预期应用环境定制生物炭-水泥基复合材料的必要性，利用其固有优势，同时减轻潜在的弱点。