钢纤维混凝土施工技术在道路桥梁施工中的应用

Application of Steel Fiber Reinforced Concrete Construction Technology in Road and Bridge Construction

摘要:

为系统评估钢纤维混凝土在道路桥梁工程中的实际适用性,文章以某城市高架桥建设项目为依托,从原材料遴选、配合比优化设计、分段浇筑作业、高频振捣密实、激光整平处理、表面拉毛成型、标准化养护及强度验收等施工环节入手,对C50钢纤维混凝土的核心施工关键技术进行了详细分析。结果表明,采用体积掺量为0.8%的端钩型钢纤维,可显著提升混凝土的抗裂性能、抗拉强度与长期耐久性;优化配套施工工艺,能够有效保障钢纤维在基体中的分散均匀性与混凝土整体结构密实度,使混凝土28 d抗压强度达到53.6 MPa,劈裂抗拉强度达到4.1 MPa,各项性能指标均优于现行规范要求。

Abstract:

To systematically evaluate the practical applicability of steel fiber reinforced concrete in road and bridge engineering, this article is based on a certain urban elevated bridge construction project. Starting from the selection of raw materials, optimization of mix proportion design, segmented pouring operation, high-frequency vibration compaction, laser leveling treatment, surface roughening forming, standardized maintenance, and strength acceptance, the core construction key technologies of C50 steel fiber reinforced concrete are analyzed in detail. The results show that the use of end hooked steel fibers with a volume fraction of 0.8% can significantly improve the crack resistance, tensile strength, and long-term durability of concrete. Optimizing the supporting construction process can effectively ensure the dispersion uniformity of steel fibers in the matrix and the overall compactness of the concrete structure, resulting in a compressive strength of 53.6 MPa and a splitting tensile strength of 4.1 MPa for the concrete at 28 d. All performance indicators are superior to the current regulatory requirements.