Chair of Occupational, Process and Fire Safety, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia.
Chair of Chemical, Biochemical and Environmental Engineering, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia.
J Environ Manage. 2022 May 1;309:114704. doi: 10.1016/j.jenvman.2022.114704. Epub 2022 Feb 14.
A critical review of the articles dealing with biochar in terms of the reuse of biomass waste in building materials and its impact on material properties was conducted using five different electronic databases; thirteen articles were selected for this critical review. Biochar was used as a replacement for cement and aggregate in cementitious composites and as an addition in wood polypropylene composites and plasters. The biochar dosages ranged from 0.5% to 40%; in most composites, the addition of biochar increased strength and reduced thermal conductivity and the bulk density of fresh mortars. Also, biochar dosages of 0.5-2% decreased, while dosages of 10-40% increased water absorption and penetration on cementitious composites. The selected studies mainly introduced biochar use in building materials as a means of biomass waste reduction and its reuse for various purposes, while carbon footprint reduction was addressed in only a few of them. Biochar-containing building material's capability of capturing CO from the air was also observed (0.033 mmol CO g to 0.138 mmol CO g). The results also showed that mortars with CO-unsaturated biochar had better mechanical and physical properties than mortars with CO-saturated biochar. Selected studies showed biochar-containing building materials have a great potential for carbon footprint reduction. However, there is a lack of comprehensive studies about biochar use in building materials concerning climate change mitigation.
采用 5 种不同的电子数据库，对涉及生物质废物在建筑材料中再利用及其对材料性能影响的生物炭文章进行了批判性回顾，共选择了 13 篇文章进行批判性回顾。生物炭被用作胶凝复合材料中水泥和骨料的替代品，以及木聚丙烯复合材料和灰泥的添加物。生物炭用量从 0.5%到 40%不等；在大多数复合材料中，添加生物炭会提高强度，降低热导率和新鲜灰浆的体积密度。此外，生物炭用量为 0.5-2%时，会降低水泥基复合材料的吸水率和渗透率，而用量为 10-40%时，会增加吸水率和渗透率。所选研究主要介绍了生物炭在建筑材料中的使用，作为减少生物质废物的一种手段，并将其再用于各种用途，而只有少数研究涉及减少碳足迹。还观察到含有生物炭的建筑材料具有从空气中捕获 CO 的能力（0.033mmolCOg至 0.138mmolCOg）。结果还表明，与 CO 饱和生物炭相比，CO 不饱和生物炭的砂浆具有更好的机械和物理性能。选定的研究表明，含生物炭的建筑材料具有很大的减少碳足迹的潜力。然而，关于生物炭在建筑材料中用于减缓气候变化的综合研究还很缺乏。
