Cement-treated sand reinforced with fiber (CTSF) has been extensively utilized as the base and subbase layers in road and pavement applications to enhance the mechanical properties of cement-treated sand (CTS). This paper aims to study the influence of seven distinct types of synthetic fibers on the mechanical performances of CTSF specimens. The 5% cement and 2% fiber were mixed with sand and water to create the CTSF specimens. The different seven fiber types used included (i) 12-mm-long polypropylene, (ii) 19-mm-long polypropylene, (iii) 33-mm-long steel, (iv) 40-mm-long polypropylene, (v) 50-mm-long steel, (vi) 55-mm-long polypropylene, and (vii) 58-mm-long polyolefin fibers. Three mechanical tests were performed on the CTSF specimens: unconfined compressive, splitting tensile, and flexural strength tests. The overall performance of the CTSF for each test was determined by six subperformance parameters: (1) improvement peak strength ratio; (2) brittleness index; (3) improvement deformation ratio; (4) improvement toughness ratio; (5) toughness index; and (6) strength index. The debonded interface between the surface of each fiber and the cemented sand matrix was observed using scanning electron microscopy. Finally, the comparative overall mechanical performance was analyzed based on the subperformance indicators to determine the most suitable fiber type corresponding to each applied loading type. The results illustrated that the most suitable fiber types for CTSF subjected to unconfined compressive, splitting tensile, and flexural stresses were 58-mm-long polyolefin fiber, 50-mm-long steel fiber, and 55-mm-long polypropylene fiber. The current study proved that synthetic fiber types significantly affect the mechanical performance of CTSF used for road and pavement applications. Thus, the overall performance concept presented in the current study is useful for selecting the most suitable fiber type corresponding to different failure mechanisms, which is of practical significance in pavement performance and design.

纤维增强水泥处理砂 (CTSF) 已广泛用作道路和路面应用中的基层和底基层，以提高水泥处理砂 (CTS) 的机械性能。本文旨在研究七种不同类型的合成纤维对 CTSF 试样力学性能的影响。将 5% 的水泥和 2% 的纤维与沙子和水混合以制成 CTSF 试样。使用的七种不同的纤维类型包括（i）12 毫米长的聚丙烯，（ii）19 毫米长的聚丙烯，（iii）33 毫米长的钢，（iv）40 毫米长的聚丙烯，（v） 50 毫米长的钢，( vi ) 55 毫米长的聚丙烯，和 ( vii) 58 毫米长的聚烯烃纤维。对 CTSF 试样进行了三项机械测试：无侧限压缩、劈裂拉伸和弯曲强度测试。CTSF每次测试的整体性能由六个子性能参数决定：（1）提高峰值强度比；(2)脆性指标；(3)提高变形率；(4)提高韧性比；(5)韧性指标；(6) 强度指标。使用扫描电子显微镜观察每根纤维表面与胶结砂基质之间的脱粘界面。最后，基于子性能指标分析比较的整体机械性能，以确定与每种施加的负载类型相对应的最合适的纤维类型。结果表明，最适合承受无侧限压缩、劈裂拉伸和弯曲应力的 CTSF 的纤维类型是 58 毫米长的聚烯烃纤维、50 毫米长的钢纤维和 55 毫米长的聚丙烯纤维。目前的研究证明，合成纤维类型显着影响 CTSF 用于道路和路面应用的机械性能。因此，当前研究中提出的整体性能概念有助于根据不同的破坏机制选择最合适的纤维类型，这对路面性能和设计具有实际意义。目前的研究证明，合成纤维类型显着影响 CTSF 用于道路和路面应用的机械性能。因此，当前研究中提出的整体性能概念有助于根据不同的破坏机制选择最合适的纤维类型，这对路面性能和设计具有实际意义。目前的研究证明，合成纤维类型显着影响 CTSF 用于道路和路面应用的机械性能。因此，当前研究中提出的整体性能概念有助于根据不同的破坏机制选择最合适的纤维类型，这对路面性能和设计具有实际意义。