高温后钢-玄武岩混杂纤维混凝土动态力学性能研究

doi:10.16552/j.cnki.issn1001-1625.2024.0731

摘要/Abstract

摘要： 为研究高温对钢-玄武岩混杂纤维混凝土(HFRC)动态力学性能的影响,本文采用φ50 mm分离式霍普金森压杆(SHPB)系统,对不同温度(25、100、200、400、600、800 ℃)下的单掺钢纤维(SFRC)、单掺玄武岩纤维(BFRC)及钢-玄武岩混杂纤维混凝土,其中钢纤维、玄武岩纤维体积掺量分别为1%、0.2%,分别开展动态压缩与动态劈裂实验,获取不同温度条件下的动态应力-应变全过程,并获得对应的动态抗压、动态劈裂强度及峰值应变。结果表明,玄武岩纤维的加入,可以保证试件在高温下的残余力学特性,而加入钢纤维后,试件的动态劈拉强度得到了明显改善。温度损伤软化对混凝土的力学性能有重要影响,加入钢纤维和玄武岩纤维可以有效缓解高温劣变,且钢-玄武岩混杂纤维混凝土在常温和高温条件下表现出更优异的力学性能。

关键词: 钢-玄武岩混杂纤维, 混凝土, 动态抗压强度, 动态劈拉强度, 分离式霍普金森压杆, 高温

Abstract: In order to study the influence of high temperature on the dynamic mechanical properties of steel-basalt hybrid fiber reinforced concrete (HFRC), a φ50 mm split Hopkinson pressure bar (SHPB) system was used to carry out dynamic compression and dynamic splitting experiments on steel fiber reinforced concrete (SFRC), basalt fiber reinforced concrete (BFRC), and hybrid fiber reinforced concrete at different temperatures (25, 100, 200, 400, 600, 800 ℃). The volume content of steel fiber and basalt fiber was 1% and 0.2%, respectively. The dynamic stress-strain process under different temperature conditions was obtained. The corresponding dynamic compressive strength, dynamic splitting strength and peak strain were obtained. The results show that the residual mechanical properties of specimens can be ensured at high temperature by adding basalt fiber, and the dynamic splitting tensile strength of specimens can be improved obviously by adding steel fiber. Temperature damage softening has an important effect on the mechanical properties of concrete. The addition of steel fiber and basalt fiber can effectively relieve the deterioration of high temperature, and steel-basalt hybrid fiber concrete exhibits better mechanical properties under normal and high temperature conditions.

Key words: steel-basalt hybrid fiber, concrete, dynamic compressive strength, dynamic splitting strength, split Hopkinson pressure bar, high temperature

中图分类号:

TU528

冉秋硕, 徐泽辉, 齐文超, 刘磊. 高温后钢-玄武岩混杂纤维混凝土动态力学性能研究[J]. 硅酸盐通报, 2025, 44(1): 69-80.

RAN Qiushuo, XU Zehui, QI Wenchao, LIU Lei. Dynamic Mechanical Properties of Steel-Basalt Hybrid Fiber Concrete after High Temperature[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(1): 69-80.

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