PVA纤维增强珊瑚骨料混凝土在高应变率荷载下的压缩性能

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

Construction and Building Materials Pub Date : 2025-10-07 DOI:10.1016/j.conbuildmat.2025.143843

Yang Cai , Zhi Fang , Ruiqi Guo , Dumin Kuang , Jie He

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引用次数: 0

摘要

研究了聚乙烯醇（PVA）纤维增强珊瑚骨料混凝土（PVA- frcac）在冲击荷载作用下的动态力学行为。采用直径为100 mm的分离式霍普金森压杆（SHPB）对PVA纤维体积分数为0 %、0.5 %、1 %、1.5 %和2 %的PVA- frcac试样在应变速率为52 s−1 ~ 204 s−1范围内进行冲击压缩试验，得到了PVA- frcac的动态应力-应变曲线和损伤模式。讨论了PVA纤维体积分数和加载率对PVA- frcac动态力学性能的影响。结果表明，PVA纤维的加入不仅提高了珊瑚骨料混凝土的动态抗压强度，而且显著改善了珊瑚骨料混凝土在冲击荷载作用下的脆性破坏特性。PVA- frcac的动态峰值应变（εdp）和动态极限应变（εdu）随PVA纤维含量的增加而增大。PVA纤维的体积分数与动态抗压强度和吸能呈正相关。在应变速率为122 s−1时，与不含PVA纤维的试样相比，体积分数为0.5%、1%、1.5%和2%的PVA纤维试样的动态抗压强度分别提高了7%、13%、23%和34%；PVA纤维试样的冲击吸收能分别提高8%、26%、41%和51%。PVA-FRCAC试件的动态抗压强度随应变速率的增大而增大。最后，基于ZWT模型，提出了估算PVA-FRCAC动态应力-应变曲线的本构模型。

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The compressive behavior of PVA fiber reinforced coral aggregate concrete under high-strain rate loading

This study investigated the dynamic mechanical behavior of polyvinyl alcohol (PVA) fiber reinforced coral aggregate concrete (PVA-FRCAC) subjected to impact loads. A 100 mm diameter split Hopkinson pressure bar (SHPB) was used for impact compression tests on PVA-FRCAC specimens with 0 %, 0.5 %, 1 %, 1.5 % and 2 % PVA fiber volume fraction at strain rates ranging from 52 s⁻¹ to 204 s⁻¹, and the dynamic stress-strain curves and damage patterns of PVA-FRCAC were obtained. The effect of PVA fiber volume fraction and loading rate on the dynamic mechanical behavior of PVA-FRCAC was discussed. The results show that the addition of PVA fibers not only increased the dynamic compressive strength of coral aggregate concrete (CAC) but also significantly improves the brittle failure characteristics of CAC under impact loads. The dynamic peak strain (

ε_{d p}

) and dynamic ultimate strain (

ε_{d u}

) of PVA-FRCAC increases with the increase of PVA fiber content. Moreover, the volume fraction of PVA fibers is positively correlated with dynamic compressive strength and energy absorption. At a strain rate of 122 s⁻¹, compared with that of specimen without PVA fiber, the dynamic compressive strength of PVA fiber specimens with a volume fraction of 0.5 %, 1 %, 1.5 % and 2 % increased by 7 %, 13 %, 23 %, and 34 %, respectively; the impact absorption energy of PVA fiber specimens increased by 8 %, 26 %, 41 %, and 51 %, respectively. The dynamic compressive strength of all PVA-FRCAC specimens increases with the increase of the strain rate. Finally, based on ZWT model, a constitutive model for estimating the dynamic stress-strain curves of PVA-FRCAC is proposed.

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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.