The extensive use of concrete sleepers in transportation and railway projects highlights the significance of repairing and maintaining such elements. The performance of concrete sleepers strengthened with steel and polypropylene (PP) fibres was investigated in this study. A series of compressive tensile and flexural strength tests was carried out on 120 cylindrical and prismatic specimens made from eight design mixes with 1% fibre content. The results indicated that the best mix design in terms of compressive and tensile strengths contained 1% steel fibres and no PP fibres, while the highest flexural strength was achieved with 0·6% steel fibres and 0·4% PP fibres. Moreover, it was found that the inclusion of fibres in concrete sleepers can reduce the amount of prestressed reinforcing bars by 40% and prevent the generation of deep cracks. The combined use of steel and PP fibres was found to enhance flexural strength by 3·5 times.

中文翻译：

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使用钢和聚丙烯纤维改善混凝土轨枕的性能

混凝土枕木在运输和铁路项目中的广泛使用凸显了维修和保养此类构件的重要性。在这项研究中，研究了用钢和聚丙烯（PP）纤维增强的混凝土轨枕的性能。对由八种设计混合物（纤维含量为1％）制成的120个圆柱和棱柱形试样进行了一系列压缩拉伸和弯曲强度测试。结果表明，就抗压强度和拉伸强度而言，最佳的混合设计包含1％的钢纤维，不含PP纤维，而0·6％的钢纤维和0·4％的PP纤维获得了最高的弯曲强度。此外，发现在混凝土轨枕中包含纤维可将预应力钢筋的数量减少40％，并防止产生深裂缝。