Qin Fengjiang, Han Yang, Wei Xinyan, Wang Xuejun, Zhang Zhigang, Zhang Xiaoyue
Key Laboratory of New Technology for Construction of Cities in Mountain Area, School of Civil Engineering, Chongqing University, Chongqing 400045, China.
CCCC First Highway Consultants Co., Ltd., No. 63 Keji 2nd Rd., High-Tech Zone, Xi'an 710068, China.
Materials (Basel). 2025 Apr 30;18(9):2047. doi: 10.3390/ma18092047.
Engineering Cementitious Composites (ECC) has gained significant attention in civil engineering due to its excellent tensile strength, crack width control capability, and remarkable ductility. This study examines the influence of the ECC strength and reinforcement on the flexural behavior of ECC slabs through four-point flexural tests. The results demonstrate that ECC is well suited for flexural applications. During flexural tests, the fibers within the ECC provide a bridging effect, allowing the ECC in the tensile zone to sustain a load while developing a dense network of fine microcracks at failure. This characteristic significantly enhances the crack resistance of ECC slabs. Despite the relatively low flexural capacity of unreinforced ECC slabs, they achieve 59.2% of the capacity of reinforced ECC slabs with a reinforcement ratio of 1.02%, demonstrating the potential for using unreinforced ECC in low-load-bearing applications. Further findings reveal that high-strength ECC (HSECC) not only improves the flexural capacity of unreinforced ECC slabs but also maintains excellent ductility, enabling a better balance between the load-bearing capacity and deformation ability. However, while reinforcement enhances both the flexural capacity and energy absorption, an excessively high reinforcement ratio significantly compromises ductility. Additionally, this study proposes a simplified calculation method for the flexural capacity of ECC slabs based on the axial force and moment equilibrium, providing theoretical support for their design and application. Due to their excellent flexural behavior, ECC slabs exhibit significant potential for use in flexural components such as bridge deck slabs and link slabs in simply supported beam bridges. With continued research and optimization, their application in engineering practice is expected to become more widespread, thereby improving the cracking resistance and durability of concrete structures.
工程水泥基复合材料（ECC）因其优异的抗拉强度、裂缝宽度控制能力和显著的延性而在土木工程中受到广泛关注。本研究通过四点弯曲试验研究了ECC强度和配筋对ECC板弯曲性能的影响。结果表明，ECC非常适合弯曲应用。在弯曲试验中，ECC中的纤维提供了一种桥接作用，使受拉区的ECC能够承受荷载，同时在破坏时形成密集的细微裂缝网络。这一特性显著提高了ECC板的抗裂性。尽管未配筋ECC板的抗弯能力相对较低，但它们达到了配筋率为1.02%的配筋ECC板能力的59.2%，表明在低承载应用中使用未配筋ECC的潜力。进一步的研究结果表明，高强度ECC（HSECC）不仅提高了未配筋ECC板的抗弯能力，还保持了优异的延性，从而在承载能力和变形能力之间实现了更好的平衡。然而，虽然配筋提高了抗弯能力和能量吸收，但过高的配筋率会显著降低延性。此外，本研究基于轴力和弯矩平衡提出了一种ECC板抗弯能力的简化计算方法，为其设计和应用提供了理论支持。由于其优异的弯曲性能，ECC板在诸如简支梁桥的桥面板和连接板等受弯构件中具有显著的应用潜力。随着持续的研究和优化，它们在工程实践中的应用有望更加广泛，从而提高混凝土结构的抗裂性和耐久性。
