Neve Sameer, Du Jiang, Barhemat Rojyar, Meng Weina, Bao Yi, Sarkar Dibyendu
Department of Civil, Environmental and Ocean Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA.
Materials (Basel). 2023 Mar 22;16(6):2522. doi: 10.3390/ma16062522.
Biochar has shown great promise in producing low-cost low-carbon concrete for civil infrastructure applications. However, there is limited research comparing the use of pristine and contaminated biochar in concrete. This paper presents comprehensive laboratory experiments and three-dimensional nonlinear finite element analysis on the mechanical, economical, and environmental performance of reinforced concrete beams made using concrete blended with biochar generated from vetiver grass roots after the roots were used in an oil extraction process. Both pristine biochar and biochar that were used to treat wastewater through adsorbing heavy metals (100 mg/L of Pb, Cu, Cd, and Zn) were investigated. The biochar was used to replace up to 6% Portland cement in concrete. Laboratory experiments were conducted to characterize the workability, mechanical properties, shrinkage, and leaching potential of the concrete blended with biochar. The results showed that using biochar could increase the compressive strengths and reduce the shrinkage of concrete without causing a leaching problem. The results from finite element analysis of the reinforced concrete beams showed that the use of biochar was able to increase the flexural performance of the beams as well as their economic and environmental performance. This research will promote the development and structural applications of low-cost low-carbon concrete.
生物炭在为民用基础设施应用生产低成本低碳混凝土方面展现出了巨大潜力。然而，比较原始生物炭和受污染生物炭在混凝土中使用情况的研究却很有限。本文针对使用从香根草根中提取油脂后产生的生物炭与混凝土混合制成的钢筋混凝土梁的力学、经济和环境性能，开展了全面的实验室实验和三维非线性有限元分析。研究了原始生物炭以及通过吸附重金属（100毫克/升的铅、铜、镉和锌）来处理废水的生物炭。生物炭在混凝土中最多替代6%的波特兰水泥。进行了实验室实验，以表征与生物炭混合的混凝土的工作性、力学性能、收缩和浸出潜力。结果表明，使用生物炭可提高混凝土的抗压强度并减少收缩，且不会引发浸出问题。钢筋混凝土梁的有限元分析结果表明，使用生物炭能够提高梁的抗弯性能以及它们的经济和环境性能。这项研究将推动低成本低碳混凝土的开发和结构应用。
