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.

丁延明,秦朝刚,徐杰,等.钢纤维布置方案对层布式钢纤维混凝土力学性能及韧性的影响[J].混凝土与水泥制品,2026,53(9):40-44,51. Ding Yanming,Qin Chaogang,Xu Jie,et al.Effects of steel fiber placement scheme on the mechanical properties and toughness of layered steel fiber reinforced concrete[J].China Concrete and Cement Products,2026,53(9):40-44,51 (in Chinese).

摘   要：针对普通3D打印混凝土抗拉强度较低、易开裂以及现有增强纤维成本高、环保性差等问题，本文以天然稻草纤维（Rice straw fibers，RSFs）为增强材料，并掺入羟丙基甲基纤维素醚（Hydroxypropyl methyl cellulose，HPMC），制备了3D打印稻草纤维增强水泥基复合材料（3D-printing rice straw fiber-reinforced cement-based composite，3DPRSFCC），研究了RSFs和HPMC的掺量对3DPRSFCC可打印性与流变性能的影响。结果表明：随着RSFs和HPMC掺量的增加，3DPRSFCC的流动度降低，最佳流动度区间为181~191 mm；适量掺入RSFs和HPMC可以显著提升3DPRSFCC打印条带的质量和打印层数，最佳掺量分别为3.5%和0.08%；掺入RSFs和HPMC能增强3DPRSFCC的流变性能。研究成果可为3DPRSFCC的配合比设计及性能优化提供参考，并助力绿色低碳 3D 打印技术在建筑工程领域的创新应用。Abstract: To address the problems of low tensile strength and susceptibility to cracking in ordinary 3D-printing concrete, as well as the high cost and poor environmental friendliness of existing reinforcing fibers, this study utilizes natural rice straw fibers (RSFs) as a reinforcing material and incorporates hydroxypropyl methyl cellulose (HPMC) to prepare a 3D-printing rice straw fiber-reinforced cement-based composite (3DPRSFCC). The effects of RSFs and HPMC contents on the printability and rheological properties of 3DPRSFCC were investigated. The results show that with increasing the contents of RSFs and HPMC, the flowability of 3DPRSFCC decreases, with the optimal flowability range being 181~191 mm. Appropriate amounts of RSFs and HPMC can significantly improve the quality of printed strips and the number of printable layers, with optimal contents of 3.5% and 0.08%, respectively. The incorporation of RSFs and HPMC enhances the rheological properties of 3DPRSFCC. The findings can provide a reference for the mix proportion design and performance optimization of 3DPRSFCC, and contribute to the innovative application of green and low-carbon 3D printing technology in the field of construction engineering.

姜德民,胡思雨,康红龙,等.稻草纤维和HPMC掺量对3D打印混凝土可打印性和流变性能的影响[J].混凝土与水泥制品,2026,53(9):45-51. Jiang Demin,Hu Siyu,Kang Honglong,et al.Effects of rice straw fiber and HPMC contents on the printability and rheological properties of 3D-printing concrete[J].China Concrete and Cement Products,2026,53(9):45-51 (in Chinese).

孙汝晓,孙浩然,丛嘉豪,等.近海寒冷地区白色清水混凝土的性能优化及表观质量控制研究[J].混凝土与水泥制品,2026,53(9):52-56. Sun Ruxiao,Sun Haoran,Cong Jiahao,et al.Research on performance optimization and apparent quality control of white fair-faced concrete in offshore cold regions[J].China Concrete and Cement Products,2026,53(9):52-56 (in Chinese).