Cheng Yu, Jiang Na, Wang Wentong, Jin Lu
College of Transportation, Shandong University of Science and Technology, Qingdao 266510, China.
Materials (Basel). 2024 Nov 27;17(23):5808. doi: 10.3390/ma17235808.
Sawdust is the cutting tailings produced during stone processing, which is difficult to deal with and has a huge stock. Therefore, it is particularly important to enhance the comprehensive utilization of sawdust. The aim of this study was to synergistically utilize sawdust with other industrial wastes (fly ash, silt, and red mud), add cement as a curing agent to prepare modified sawdust, and analyze its performance through an unconfined compressive strength test, dry and wet cycle tests, and SEM. The results showed that the compressive strength of modified sawdust with different solid waste dosages was more than 2.5 MPa after 7 days of maintenance, the strength was basically more than 4 MPa after 28 days of maintenance, and 8% solid waste dosage had the best effect. In addition, the modified saw mud with 8% fly-ash dosage had superior wet and dry cycle resistance, with expansion and shrinkage lower than 0.5% and good stability. This study provides a new idea for the synergistic utilization of saw mud and other solid wastes, and it is recommended to consider 8% solid waste dosage to optimize the performance in practical applications.
锯末是石材加工过程中产生的切割尾矿，难以处理且存量巨大。因此，加强锯末的综合利用尤为重要。本研究的目的是将锯末与其他工业废弃物（粉煤灰、淤泥和赤泥）协同利用，添加水泥作为固化剂制备改性锯末，并通过无侧限抗压强度试验、干湿循环试验和扫描电子显微镜对其性能进行分析。结果表明，不同固体废物掺量的改性锯末养护7天后抗压强度均大于2.5MPa，养护28天后强度基本大于4MPa，其中8%的固体废物掺量效果最佳。此外，粉煤灰掺量为8%的改性锯末具有优异的抗干湿循环性能，胀缩率低于0.5%，稳定性良好。本研究为锯末与其他固体废物的协同利用提供了新思路，建议在实际应用中考虑8%的固体废物掺量以优化性能。
