Deng Junshuang, Yao Yongsheng, Huang Chao
Jiangxi Transportation Engineering Group Co., Ltd., Nanchang 330038, China.
College of Traffic & Transportation, Chongqing Jiaotong University, Chongqing 400074, China.
Materials (Basel). 2024 Sep 14;17(18):4525. doi: 10.3390/ma17184525.
The rapid expansion of highway infrastructure in the mountainous regions of China has led to a significant increase in tunnel construction, generating substantial amounts of tunnel waste slag. Concurrently, the development of transportation infrastructure has created a critical shortage of natural aggregates, necessitating the exploration of alternative sustainable sources. This study aimed to conduct a comprehensive evaluation of the physical and mechanical properties of tunnel waste slag and explore its potential for utilization in cement-stabilized base courses for highway engineering applications. The uniaxial compressive strength of the parent rock (tunnel waste slag) ranged from 81 MPa to 89 MPa in the desiccated state, indicating its suitability for use as a construction material. This study also determined the maximum dry density (2.432 g/cm) and optimal moisture content (5.4%) of cement-stabilized mixtures incorporating recycled aggregates derived from tunnel waste slag. The splitting tensile strength of these mixtures at 28 days varied from 0.48 MPa to 0.73 MPa, demonstrating robust mechanical performance. Moreover, the unconfined compressive strength of these mixtures escalated from 7.0 MPa at 7 days to 11.0 MPa at 90 days, signifying a substantial enhancement in strength over time. These results validate the viability of utilizing tunnel waste slag in highway engineering and furnish valuable insights for designers, concrete manufacturers, and construction firms engaged in the development of cement-stabilized aggregate base courses.
中国山区公路基础设施的迅速扩张导致隧道建设显著增加，产生了大量的隧道废渣。与此同时，交通基础设施的发展造成了天然集料的严重短缺，因此有必要探索可持续的替代来源。本研究旨在对隧道废渣的物理和力学性能进行全面评估，并探讨其在公路工程水泥稳定基层中的应用潜力。母岩（隧道废渣）在干燥状态下的单轴抗压强度为81MPa至89MPa，表明其适合用作建筑材料。本研究还确定了掺入隧道废渣再生集料的水泥稳定混合料的最大干密度（2.432g/cm）和最佳含水量（5.4%）。这些混合料在28天时的劈裂抗拉强度为0.48MPa至0.73MPa，显示出良好的力学性能。此外，这些混合料的无侧限抗压强度从7天时的7.0MPa升至90天时的11.0MPa，表明强度随时间有显著提高。这些结果验证了在公路工程中利用隧道废渣的可行性，并为从事水泥稳定集料基层开发的设计师、混凝土制造商和建筑公司提供了有价值的见解。
