基于细观力学的GS-UHPCC界面黏结行为研究

doi:10.16552/j.cnki.issn1001-1625.2024.1387

摘要/Abstract

摘要： 为探讨玻璃砂超高性能水泥基复合材料(GS-UHPCC)的界面黏结性能,开展了不同纤维埋深和加载速率下GS-UHPCC的纤维拉拔试验,定量表征了钢纤维与基体间的界面黏结性能,并在试验研究的基础上讨论了钢纤维与基体间的界面力学性能,建立了钢纤维的荷载-滑移模型。结果表明,随着纤维埋深的增加,钢纤维与GS-UHPCC的界面黏结性能显著提高。当纤维埋深达到12和18 mm时,钢纤维的拉拔峰值荷载比纤维埋深为6 mm的试件分别增大43.81%和87.56%,且拉拔能分别增大63.27%和176.36%。此外,钢纤维与GS-UHPCC的界面黏结性能表现出明显的速率敏感性,当加载速率从0.5 mm/min增加到5.0 mm/min时,钢纤维的拉拔峰值荷载和拉拔能平均涨幅分别为27.16%和127.98%。综合考虑平均黏结强度和衰减黏结强度的荷载-滑移模型,能够有效表征钢纤维与基体的界面行为。

关键词: 玻璃砂超高性能水泥基复合材料, 界面黏结性能, 荷载-滑移模型, 纤维拉拔试验, 纤维埋深, 加载速率

Abstract: In this study, fiber pullout tests were conducted under varying fiber embedment depths and loading rates to investigate the interfacial bonding properties of glass-sand ultra-high performance cementitious composite (GS-UHPCC). Quantitative analysis was performed on the interfacial bonding properties and mechanical properties of steel fibers and the matrix. Furthermore, the load-slip model of steel fiber was established. The results show that the interfacial bonding properties between steel fiber and GS-UHPCC are significantly improved with the increase of fiber embedment depth. When the fiber embedment depth increases to 12 mm and 18 mm, the pullout peak load of steel fiber increases by 43.81% and 87.56%, respectively, compared with specimen with fiber embedment depth of 6 mm. Similarly, the pullout energy increases by 63.27% and 176.36%, respectively. In addition, the interfacial bonding properties between steel fiber and GS-UHPCC exhibit obvious rate sensitivity. When the loading rate increases from 0.5 mm/min to 5.0 mm/min, the average increases of the pullout peak load and pullout energy of steel fiber are 27.16% and 127.98%, respectively. The load-slip model considering the steel average bonding strength and decayed bonding strength can effectively characterize the interfacial behavior between the steel fibers and the matrix.

Key words: glass-sand ultra-high performance cementitious composite (GS-UHPCC), interfacial bonding property, load-slip model, fiber pullout test, fiber embedment depth, loading rate

中图分类号:

TU528.572

张亚芳, 叶国诚, 曾科, 许敬彬, 包嗣海. 基于细观力学的GS-UHPCC界面黏结行为研究[J]. 硅酸盐通报, 2025, 44(6): 2070-2078.

ZHANG Yafang, YE Guocheng, ZENG Ke, XU Jingbin, BAO Sihai. Interfacial Bonding Behavior of GS-UHPCC Based on Mesomechanics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2070-2078.

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