Boutkhil Hanane, Fellak Somia, Aouan Badr, Alehyen Saliha, Ullah Riaz, Bari Ahmed, Fidan Hafize, Ercisli Sezai, Assouguem Amine, Taibi M'hamed
Physico-Chemical Laboratory of Inorganic and Organic Materials (LPCMIO), Higher Normal School (E.N.S) Avenue Mohamed Bel Hassan El Ouazzani, BP 5118, Mohammed V University (UM5). Rabat 10000, Morocco.
Department of Chemistry, Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, B.P. 2202-Imouzzer Road, Fez, Morocco.
ACS Omega. 2024 Mar 18;9(12):14419-14428. doi: 10.1021/acsomega.4c00147. eCollection 2024 Mar 26.
This study investigates the valorization of coal fly ash (FA-C) generated by the Jerada thermal power plant, aiming to address the pressing need for sustainable construction practices and reduced greenhouse gas emissions in the concrete industry. It is widely used as a pozzolanic material. The key objective is to harness the potential of FA-C as a supplementary material in concrete production, which not only reduces costs but also contributes to environmental sustainability. To achieve this objective, various concrete mixtures were formulated, with FA-C serving as a partial substitute for cement at percentages ranging from 15 to 50%. According to ASTM standards, compressive strength tests were conducted on standard-sized cylinders at 7 and 28 days. The results revealed that the blend containing 15% FA-C exhibited the highest compressive strength, indicating its effectiveness as a concrete additive. Furthermore, this study delves into the rheological properties of concrete mixes, an essential aspect of successful concrete processing. It was observed that a higher replacement level of FA-C significantly improved the rheology, leading to reduced water demand and a linear decrease in plastic viscosity over time. The rheological parameters stabilized after a certain period, demonstrating the controllability of concrete flow behavior with FA-C. The investigation also employed three analytical methods-Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM)-to comprehensively analyze both raw materials and processed samples. FTIR analysis highlighted the minimal impact of FA particles on hydration product formation, emphasizing the role of FA-C in enhancing the concrete's strength. XRD analysis confirmed the presence of an amorphous phase crucial for FA's reactivity. SEM observations revealed that concrete with 15% FA-C exhibited a more uniform microstructure with aluminosilicate gel, while 50% FA-C mixes showed increased porosity and nonhomogeneity due to unreacted FA particles.
本研究调查了杰拉达热电厂产生的粉煤灰（FA-C）的增值利用，旨在满足混凝土行业对可持续建筑实践和减少温室气体排放的迫切需求。它被广泛用作火山灰质材料。关键目标是挖掘FA-C作为混凝土生产辅助材料的潜力，这不仅能降低成本，还有助于环境可持续性。为实现这一目标，配制了各种混凝土混合物，其中FA-C作为水泥的部分替代品，替代比例为15%至50%。根据ASTM标准，在7天和28天时对标准尺寸的圆柱体进行抗压强度测试。结果表明，含15%FA-C的混合物表现出最高的抗压强度，表明其作为混凝土添加剂的有效性。此外，本研究深入探讨了混凝土混合物的流变性能，这是成功进行混凝土加工的一个重要方面。观察到较高的FA-C替代水平显著改善了流变性能，导致需水量减少，塑性粘度随时间呈线性下降。流变参数在一定时期后趋于稳定，表明FA-C对混凝土流动行为具有可控性。该研究还采用了三种分析方法——傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）——对原材料和加工后的样品进行全面分析。FTIR分析突出了FA颗粒对水化产物形成的影响最小，强调了FA-C在增强混凝土强度方面的作用。XRD分析证实了对FA反应性至关重要的非晶相的存在。SEM观察表明，含15%FA-C的混凝土表现出更均匀的微观结构，含有铝硅酸盐凝胶，而含50%FA-C的混合物由于未反应的FA颗粒而显示出孔隙率增加和不均匀性。
