Bhomia Amit, Routroy Srikanta, Singhal Anupam, Samyal Rahul
Department of Mechanical Engineering, Birla Institute of Technology & Science, Pilani, Rajasthan, 333031, India.
Department of Civil Engineering, Birla Institute of Technology & Science, Pilani, Rajasthan, India.
Sci Rep. 2025 Jul 4;15(1):23884. doi: 10.1038/s41598-025-08359-7.
The disposal of Stainless-Steel Pickling Sludge (SSPS) in landfills remains an important issue. Utilizing SSPS as construction material mitigates the negative environmental effects associated with its disposal, providing a sustainable solution. This study investigates co-utilization of SSPS and fly ash as partial substitution of river sand on cement sand bricks properties. Nine cement sand bricks compositions, including control mix, were prepared with varying composition of SSPS, fly ash and river sand. Four compositions were developed with SSPS varied from 2.5 to 10% with fixed fly ash content of 50%. Four additional compositions with varying fly ash content from 40 to 47.5% and varying SSPS 2.5-10% content as partial substitution of river sand were prepared. The developed bricks demonstrated that gradual increment of SSPS (2.5-10%) and reduction of fly ash (47.5-40%) proved incremental to the compressive strength up to 28 MPa. In addition, the morphological analysis using Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and X-ray Fluorescence (XRF) were conducted for the compositions. The microstructure analysis showed that with inclusion of fly ash, Mix 2 (M2) compositions revealed a dense microstructure validating the sorptivity results as compared to Mix 1 (M1) compositions. Finally, the cost estimation of the waste valorized bricks as compared to the control bricks was observed to be significantly low. The experiment outcomes concluded adoption of SSPS-fly ash waste valorized bricks as a greener alternative to disposal.
在垃圾填埋场处置不锈钢酸洗污泥（SSPS）仍然是一个重要问题。将SSPS用作建筑材料可减轻与其处置相关的负面环境影响，提供一种可持续的解决方案。本研究调查了SSPS和粉煤灰作为河砂的部分替代品对水泥砂浆砖性能的共同利用情况。制备了九种水泥砂浆砖组合物，包括对照混合物，其SSPS、粉煤灰和河砂的组成各不相同。制备了四种组合物，其中SSPS含量从2.5%变化到10%，粉煤灰固定含量为50%。另外制备了四种组合物，其粉煤灰含量从40%变化到47.5%，SSPS含量从2.5%变化到10%，作为河砂的部分替代品。所制备的砖表明，SSPS（2.5%-10%）的逐渐增加和粉煤灰（47.5%-40%）的减少证明抗压强度逐渐增加，最高可达28MPa。此外，对这些组合物进行了扫描电子显微镜（SEM）、X射线衍射（XRD）和X射线荧光（XRF）的形态分析。微观结构分析表明，与混合物1（M1）组合物相比，混合物2（M2）组合物由于包含粉煤灰而呈现出致密的微观结构，这验证了吸水性结果。最后，观察到与对照砖相比，废物增值砖的成本估计显著较低。实验结果得出结论，采用SSPS-粉煤灰废物增值砖作为一种更环保的处置替代方案。
