固废基四元胶凝体系对钢纤维混凝土性能影响及在轨道交通道床中的应用可行性
Effect of solid waste-based quaternary cementitious system on properties of steel fiber reinforced concrete and its application feasibility in rail transit track bed
关键词：
钢纤维混凝土；抗压强度；弯曲韧性；纤维-基体界面黏结性能；孔结构；工程应用
Key words：
Steel fiber reinforced concrete; Compressive strength; Bending toughness; Fiber-matrix interfacial bond performance; Pore structure; Engineering application
刊期：
2026年第8期
DOI：
10.19761/j.1000-4637.25100454
文章编号：
基金项目：
江苏省自然科学基金项目（BK20220254）；苏州市轨道交通集团自立项目（SZZG19YJ1080002）。
作者：
朱 进1，宋秋磊2，吴 浩2，*，徐建鹏1，张秋彬3
单位：
1.苏州轨道交通建设有限公司，江苏 苏州215008；2.苏州混凝土水泥制品研究院有限公司， 江苏 苏州215004；3.苏州轨道交通科技创新研究院有限公司，江苏 苏州215008
摘要
摘 要：为有效提升轨道交通道床用钢纤维混凝土的弯曲韧性，推动轨道工程向低碳、高效、高质量方向发展，本文依托苏州轨道交通 8 号线道床工程，研制了粉煤灰-矿粉-硅灰-水泥（FA-GS-SF-C）和粉煤灰-矿粉-偏高岭土-水泥（FA-GS-KL-C）两种固废基四元胶凝体系钢纤维混凝土，研究了四元胶凝体系中m硅灰∶m粉煤灰、m偏高岭土∶m粉煤灰对钢纤维混凝土性能的影响，并进行了机理和工程应用可行性分析。结果表明：与采用纯水泥的基准组JZ相比，FA-GS-SF-C、FA-GS-KL-C胶凝体系均可大幅提高试件抗压强度、弯曲韧性，增强纤维-基体界面黏结性能；两种固废基四元胶凝体系通过多组分协同作用有效提高了混凝土基体密实度，且FA-GS-KL-C胶凝体系的作用效果相对更好；当m偏高岭土∶m粉煤灰为3∶7时，试件的孔隙率较JZ组降低了40.3%；工程应用可行性分析结果表明，通过合理的配合比设计，可使多元固废基胶凝材料应用于轨道道床工程。研究成果可为低碳、高韧性轨道道床及类似道桥工程用填充材料的设计研发提供参考。
Abstract: To effectively improve the bending toughness of steel fiber reinforced concrete for rail transit track bed and advance the development of low-carbon, high-efficiency and high-quality track engineering, this paper relies on the track bed project of Suzhou Rail Transit Line 8 to develop two types of solid waste-based quaternary cementitious system steel fiber reinforced concrete, namely fly ash-mineral powder-silica fume-cement (FA-GS-SF-C) and fly ash-mineral powder-metakaolin-cement (FA-GS-KL-C). The effects of the msilica fume ∶mfly ash and mmetakaolin ∶mfly ash within the quaternary cementitious systems on the performance of steel fiber reinforced concrete were investigated, and the mechanism and application feasibility were carried out. The results show that compared with the reference group JZ adopting pure cement, both the FA-GS-SF-C and FA-GS-KL-C cementitious systems can significantly enhance the compressive strength and bending toughness of specimens, and can strengthen the fiber-matrix interfacial bond performance. The two solid waste-based quaternary cementitious systems effectively increase the compactness of concrete matrix through multi-component synergistic effects, and the FA-GS-KL-C cementitious system exhibits relatively superior performance. When the mmetakaolin ∶mfly ash is 3:7, the porosity of specimens is reduced by 40.3% compared with the JZ group. The feasibility analysis for engineering application shows that multi-solid waste-based cementitious materials can be applied to track bed projects via reasonable mix proportion design. The research findings can provide a reference for the design and development of low-carbon, high-toughness filling materials used in track beds and similar road and bridge engineering projects.
结论
（1）与JZ组相比，两种多元固废基胶凝体系试件的抗压强度均较高。与FA-GS-KL-C胶凝体系相比，FA-GS-SF-C胶凝体系对抗压强度的提高效果相对更好，且当m硅灰∶m粉煤灰为3∶7时，对抗压强度的提高效果最优。
（2）与JZ组相比，两种多元固废基胶凝体系试件的弯曲荷载-挠度曲线形态更加饱满，曲线所包围的面积明显更大，表明其韧性较好。与FA-GS-SF-C胶凝体系相比，FA-GS-KL-C胶凝体系对弯曲韧性的提高效果相对更好，且当m偏高岭土∶m粉煤灰为3∶7时，试件表现出相对最优的弯曲韧性。
（3）与JZ组相比，两种多元固废基胶凝体系试件的纤维-基体黏结强度和纤维拉拔能均较高。其中，FA-GS-SF-C胶凝体系对纤维-基体黏结强度的提升效果相对更好，最佳m硅灰∶m粉煤灰为3∶7；而FA-GS-KL-C胶凝体系对纤维拉拔能的提升效果相对更好，最佳m偏高岭土∶m粉煤灰为3∶7。另外，纤维拉拔能与混凝土弯曲韧性之间呈明显的正相关关系，具体表现为随着纤维拉拔能的增加，混凝土的弯曲韧性曲线面积增大。
（4）与JZ组试件相比，两种多元固废基胶凝体系试件的孔结构均得到了显著优化，毛细孔、大孔数量减少。与采用FA-GS-SF-C胶凝体系的SFC2组相比，采用FA-GS-KL-C胶凝体系的KLC3组试件的内部结构密实度相对更好，孔隙率较JZ组降低了40.3%。另外，需要注意的是，混凝土基体密实度与其弯曲韧性呈负相关关系，具体表现为孔隙率降低，弯曲韧性曲线面积增大。
（5）本试验所设计的KLC3多元固废基胶凝体系的力学性能、抗渗性能和弯曲韧性均优于苏州轨道交通8号线道床填充工程用混凝土，说明通过合理的配合比设计，可将多元固废基胶凝材料应用于轨道道床及类似道桥工程中。
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引用本文
朱进,宋秋磊,吴浩,等.固废基四元胶凝体系对钢纤维混凝土性能影响及在轨道交通道床中的应用可行性[J].混凝土与水泥制品,2026,53(8):31-37,57. Zhu Jin,Song Qiulei,Wu Hao,et al.Effect of solid waste-based quaternary cementitious system on properties of steel fiber reinforced concrete and its application feasibility in rail transit track bed[J].China Concrete and Cement Products,2026,53(8):31-37,57 (in Chinese).
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