Patel Ravi, Stobbs Jarvis, Acharya Bishnu
Department of Chemical and Biological Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK, S7N5A9, Canada.
Canadian Light Source, 44 Innovation Boulevard, Saskatoon, SK, S7N2V3, Canada.
Sci Rep. 2025 Jul 1;15(1):22192. doi: 10.1038/s41598-025-07210-3.
Biochar is a waste biomass derived carbon enriched solid material that is capable for carbon sequestration. This study illustrates a revolutionary study on the waste biomass pyrolyzed biochar-based concrete with 0-5 wt% cement replacement by the biochar as a potential binder material without using any petroleum-derived superplasticizer. The mechanical strength properties along with the water absorption of the proposed hybrid composite are evaluated for a fixed concrete composition. Moreover, the volumetric property of the formed concrete is determined using the synchrotron-based micro-computed tomography. This study revealed that biochar incorporation up to optimum concentration helps in enhancing the mechanical strength properties of concrete. The optimum dosage of biochar which is 2 wt% increases the compressive strength, splitting tensile strength, and flexural load at fracture by 18.95%, 19.64%, and 12% respectively. Moreover, the optimum sample has shown lowest water absorption among all other samples which indicated reduced porosity in the concrete with biochar introduction. X-ray diffraction analysis confirmed the more production of calcium-silicate-hydrate hydration products for the optimum biochar-augmented concrete composites which resulted in high strength concrete formation. However, the higher concentration of biochar seemed to have negative influence on the strength and durability properties of the concrete which can be seen in terms of physical strength properties and water absorption data. Nonetheless, our novel design of biochar-based concrete can open up a new field of biochar application in construction materials without sacrificing its mechanical strength and water absorption properties to develop green concrete composites.
生物炭是一种源自废弃生物质的富含碳的固体材料，能够进行碳固存。本研究阐述了一项具有革命性的研究，即关于以废弃生物质热解生物炭为基础的混凝土，该混凝土用生物炭替代0 - 5 wt%的水泥作为潜在的胶凝材料，且不使用任何石油衍生的高效减水剂。对于固定的混凝土组成，评估了所提出的混合复合材料的机械强度性能以及吸水率。此外，使用基于同步加速器的微观计算机断层扫描确定了成型混凝土的体积特性。该研究表明，掺入达到最佳浓度的生物炭有助于提高混凝土的机械强度性能。生物炭的最佳用量为2 wt%，可使抗压强度、劈裂抗拉强度和断裂时的弯曲荷载分别提高18.95%、19.64%和12%。此外，最佳样品在所有其他样品中显示出最低的吸水率，这表明引入生物炭后混凝土的孔隙率降低。X射线衍射分析证实，对于最佳生物炭增强混凝土复合材料，硅酸钙水合物水化产物的生成更多，从而形成了高强度混凝土。然而，较高浓度的生物炭似乎对混凝土的强度和耐久性性能有负面影响，这在物理强度性能和吸水率数据方面都可以看出。尽管如此，我们基于生物炭的混凝土新设计可以在不牺牲其机械强度和吸水率性能的情况下，开辟生物炭在建筑材料中的新应用领域，以开发绿色混凝土复合材料。
