冲击荷载作用下PVC管约束再生骨料混凝土压缩力学性能研究

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-25 DOI:10.1016/j.conbuildmat.2025.144154

Chunyang Liu , Enze Liu , Aoran Bao , Abudureyimujiang Aosimanjiang

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引用次数: 0

摘要

研究pvc约束再生骨料混凝土在动冲击荷载作用下的损伤特征及力学性能变化规律，对保证再生骨料混凝土结构设计的安全性具有重要意义。本研究采用聚氯乙烯（PVC）管材作为围封材料。通过准静态压缩试验和Φ75 mm裂霍普金森压杆（SHPB）动态冲击试验，研究了不同再生粗骨料替代率（0 %、100 %）和PVC约束对RAC单轴压缩动态力学性能的影响，应变率为50 ~ 120 s⁻1。结果表明，聚氯乙烯约束能有效提高RAC试件的抗冲击能力和耗能能力，且当替代率为100% %时效果更为明显。RAC试件的动态抗压强度表现出明显的应变速率强化效应。聚氯乙烯约束增强了这种强化效果，但降低了动态增加因子（DIF）的应变率敏感性。结合应变率和替换率参数的修正Weibull模型能够准确预测动强度分布，平均误差仅为1.47 %。此外，发现分形维数可以定性表征RAC试件的破坏演化趋势和严重程度。通过定量分析破碎分形特征与力学性能之间的关系，可以对材料进行更全面的评价。

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Study on the compression mechanical property of PVC pipe confined recycled aggregate concrete under impact load

Investigating the damage characteristics and variation laws of mechanical properties of PVC-confined Recycled Aggregate Concrete (RAC) under dynamic impact loading is essential for ensuring the safety of RAC structural design. This study employs polyvinyl chloride (PVC) pipes as confining materials. Through quasi-static compression tests and Φ75 mm split hopkinson pressure bar (SHPB) dynamic impact tests, the influence of different recycled coarse aggregate replacement rates (0 %, 100 %) and PVC confinement on the uniaxial compression dynamic mechanical properties of RAC was investigated within the strain rate range of 50–120 s⁻¹. The results showed that PVC confinement can effectively enhance the impact resistance and energy dissipation capacity of RAC specimens, with a more pronounced effect observed for specimens with a 100 % replacement ratio. The dynamic compressive strength of RAC specimens exhibited a clear strain rate strengthening effect. PVC confinement enhanced this strengthening effect but reduced the strain rate sensitivity of the dynamic increase factor (DIF). A modified Weibull model incorporating strain rate and replacement rate parameters was able to accurately predict the dynamic strength distribution, with an average error of only 1.47 %. Additionally, the fractal dimension was found to qualitatively characterize the failure evolution trend and severity of RAC specimens. By quantitatively analyzing the correlation between Fractal Characteristics of Fragmentation and mechanical performance, a more comprehensive material evaluation can be achieved.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.