摘   要：层布式钢纤维混凝土（layered steel fiber reinforced concrete，LSFRC）可通过分层铺设钢纤维减少纤维用量，改善混凝土的力学性能，在水泥混凝土路面工程中的应用前景良好。为进一步推动LSFRC路面技术的工程应用，本文研究了波纹钢纤维的掺量（1.0%、1.5%、2.0%）、布置层数（单层、双层）和实际用量计算厚度（20 mm、30 mm）对LSFRC力学性能与韧性的影响。结果表明：LSFRC发生劈裂抗拉和抗折破坏时，以贯穿裂缝为主；单层LSFRC试件的脆性特征比双层LSFRC试件明显，但随着钢纤维掺量与计算厚度的增加，试件的脆性特征减弱；采用合理的钢纤维布置方案可显著提升混凝土的劈裂抗拉强度与抗折强度，当钢纤维掺量为1.5%、双层布置且计算厚度为30 mm时，LSFRC试件的劈裂抗拉强度与抗折强度相对最优；LSFRC的弯曲韧性显著优于普通混凝土，实际应用时应兼顾强度与韧性指标，优选纤维布置方案。研究成果可为LSFRC路面的选材、设计及施工提供参考。

Abstract: Layered steel fiber reinforced concrete (LSFRC) can reduce the amount of steel fibers and improve the mechanical properties of concrete through layered placement of steel fibers, showing promising application prospects in cement concrete pavement engineering. To further promote the engineering application of LSFRC pavement technology, this study investigated the effects of crimped steel fiber dosage (1.0%, 1.5%, 2.0%), number of placement layers (single-layer, double-layer), and calculated thickness based on actual dosage (20 mm, 30 mm) on the mechanical properties and toughness of LSFRC. The results indicate that during splitting tensile and flexural failure of LSFRC, through-cracks are the dominant failure mode. The brittle characteristics of single-layer LSFRC specimens are more pronounced than those of double-layer LSFRC specimens. However, as the steel fiber dosage and calculated thickness increase, the brittle characteristics of the specimens diminish. Adopting a reasonable steel fiber placement scheme can significantly enhance the splitting tensile strength and flexural strength of concrete. When the steel fiber dosage is 1.5%, with a double-layer placement and a calculated thickness of 30 mm, the splitting tensile strength and flexural strength of the LSFRC specimens are relatively optimal. The flexural toughness of LSFRC is significantly superior to that of ordinary concrete. In practical applications, both strength and toughness indicators should be considered comprehensively, and the fiber placement scheme should be optimized accordingly. The findings can provide a reference for material selection, design, and construction of LSFRC pavements.