摘   要：针对现有桥梁护栏存在的防护性能不足、大规模改造需求、复杂施工条件等挑战，提出了“强-弱结合、刚-柔协同”的功能梯度型超高性能混凝土-发泡聚苯乙烯（Ultra high performance concrete-Expandable polystyrene，UHPC-EPS）夹芯护栏体系，通过LS-Dyna数值仿真技术，模拟了该护栏在小型客车、大型客车、大型货车碰撞场景下的轨迹偏移规律与损伤演化过程，并与现浇混凝土护栏开展了大型货车冲击工况下的力学性能对比研究。结果表明：功能梯度型UHPC-EPS夹芯护栏兼具优异的车辆轨迹导向能力和运行稳定性调控性能，同时具有强抗穿透特性与便捷的后期修复优势；在大型货车冲击工况下，UHPC-EPS夹芯护栏的峰值撞击力较现浇混凝土护栏降低了约12%，峰值剪力降低了约35%；配套研发的标准化施工工艺采用工厂预制、现场装配、一次成型的快速部署，具有显著的工程适配性与产业化推广价值。Abstract： In order to address the challenges posed by insufficient protective capacity, large-scale retrofit demand, and constrained construction conditions of existing bridge guardrail, a functionally graded ultra high performance concrete-expandable polystyrene (UHPC-EPS) sandwich guardrail system featuring the integration of high and low strength components and the synergy of rigid and flexible properties is proposed. The trajectory deviation patterns and damage evolution processes of this guardrail under collision scenarios involving small cars, city buses, and heavy trucks were simulated through LS-Dyna numerical simulation technology, and a comparative study of mechanical performance under heavy truck collision conditions was conducted with cast-in-place concrete guardrails. The results show that the functionally graded UHPC-EPS sandwich guardrail combines outstanding vehicle trajectory guidance capability with operational stability control, and exhibits high penetration resistance and convenient post-repair advantages. Under heavy truck collision conditions, the peak impact force of the UHPC-EPS sandwich guardrail is reduced by approximately 12% compared to cast-in-place concrete guardrails, and the peak shear is reduced by approximately 35%. The standardized construction process developed for this system employs factory prefabrication, on-site assembly, and one-time forming for rapid deployment, demonstrating significant engineering adaptability and industrialization potential. 

李志勇,罗征,李应根,等.功能梯度型UHPC-EPS夹芯结构在既有桥梁护栏改造中的应用[J].混凝土与水泥制品,2026(2):86-92. LI Z YLUO Z,LI Y G,et al.Application of functionally graded UHPC-EPS sandwich structure in the retrofit of existing bridge guardrail[J].China Concrete and Cement Products,2026(2):86-92.

摘   要：研究了粗骨料类型（天然粗骨料、钢渣粗骨料、再生混凝土粗骨料）和钢纤维类型（弯钩形钢纤维SFD1、平直形钢纤维SFX2）对超高性能混凝土（Ultra-high performance concrete，UHPC）工作性和力学性能的影响。结果表明：用钢渣粗骨料全替代天然粗骨料后，UHPC的流动性下降，抗压强度增大，另外，抗弯强度在不掺钢纤维的情况下有所增大，而在掺钢纤维的情况下有所下降；用再生混凝土粗骨料全替代天然粗骨料后，UHPC的流动性、抗压强度和抗弯强度基本下降；掺入钢纤维后，UHPC的流动性显著下降，抗压和抗弯强度基本有所增大；平直形钢纤维SFX2对提升UHPC的抗压强度更有效，弯钩形钢纤维SFD1对提升UHPC的抗弯强度更有效。Abstract: The effects of coarse aggregate types (natural coarse aggregate, steel slag coarse aggregate, recycled concrete coarse aggregate) and steel fiber types (hooked steel fiber SFD1, straight steel fiber SFX2) on the workability and mechanical properties of ultra-high performance concrete (UHPC) were studied. The results show that after replacing natural coarse aggregates with steel slag coarse aggregates, the flowability of UHPC decreases, the compressive strength increases. In addition, the bending strength increases when UHPC does not contain steel fibers, but decreases when steel fibers are added. After replacing natural coarse aggregates with recycled concrete coarse aggregates, the flowability, compressive strength, and bending strength of UHPC decrease significantly. After the addition of steel fibers, the flowability of UHPC significantly decreases, while the compressive strength and bending strength basically increase. The straight steel fiber SFX2 is more effective in improving the compressive strength of UHPC, while the hooked steel fiber SFD1 is more effective in improving the bending strength of UHPC.

李朋.不同类型粗骨料和钢纤维对桥面铺装UHPC工作性和力学性能的影响[J].混凝土与水泥制品,2026(2):93-97. LI P.The influence of different types of coarse aggregates and steel fibers on the workability and mechanical properties of UHPC for bridge deck Pavement[J].China Concrete and Cement Products,2026(2):93-97.

摘   要：依托东营黄河公铁大桥大体积混凝土塔座结构，掺入30%的粉煤灰，研究了降黏剂和抗裂剂对大体积混凝土力学性能、热学性能、收缩性能和耐久性能的影响。结果表明：单掺降黏剂可小幅提高混凝土的后期劈裂抗拉强度和弹性模量，而复掺抗裂剂则会降低混凝土各龄期的劈裂抗拉强度；掺入降黏剂可在一定程度上提高混凝土的早期绝热温升值和最大温升速率，而复掺抗裂剂可显著降低混凝土的早期水化速率和绝热温升值；降黏剂的掺入可降低混凝土的自生体积变形，复掺抗裂剂可大幅降低混凝土的自生体积变形；降黏剂单掺或与抗裂剂复掺均可以降低混凝土的干燥收缩；单掺降黏剂可提高混凝土的抗氯离子渗透性能，而降黏剂和抗裂剂复掺则会降低混凝土的抗氯离子渗透性能；采用F30V12A6组配合比（30%粉煤灰、12%降黏剂、6%抗裂剂）进行塔座混凝土施工，混凝土的工作性、抗裂性能和外观质量均较好。Abstract: Based on the mass concrete tower pedestal structure of Dongying Yellow River Public Railway Bridge, by adding 30% fly ash, the effects of viscosity reducer and anti-cracking agent on the mechanical properties, thermal properties, shrinkage properties, and durability of mass concrete were studied. The results show that the single addition of viscosity reducer can slightly improve the later splitting tensile strength and elastic modulus of concrete, while the combination of anti-cracking agent will reduce the splitting tensile strength of concrete at various ages. The addition of viscosity reducer can to some extent increase the early adiabatic temperature rise value and maximum temperature rise rate of concrete, while the combination of anti-cracking agent can significantly reduce the early hydration rate and adiabatic temperature rise value of concrete. The addition of viscosity reducer can reduce the autogenous volume deformation of concrete, and the combination of anti-cracking agent can significantly reduce the autogenous volume deformation of concrete. Adding viscosity-reducing agent either single addition or combination with anti-cracking agent can effectively reduce the dry shrinkage of concrete. Single addition of viscosity reducer can improve the resistance of concrete to chloride ion penetration, while the combination of viscosity reducer and anti-cracking agent can reduce the resistance of concrete to chloride ion penetration. The F30V12A6 mix proportion (30% fly ash, 12% viscosity reducer, 6% anti-cracking agent) is used for tower pedestal concrete construction, and the workability, crack resistance, and appearance quality of the concrete are all good.

盖珂瑜,龙勇,董继红,等.降黏剂和抗裂剂对桥梁塔座大体积混凝土性能的影响[J].混凝土与水泥制品,2026(2):98-102. GE K Y,LONG Y,DONG J H,et al.Influence of viscosity reducer and anti-cracking agent on the performance of mass concrete for bridge tower pedestal[J].China Concrete and Cement Products,2026(2):98-102.