UHPC-NC界面结合状态研究
PDF下载 (186)李萌萌,杨 恒,黄一昶,李 哲,陈江瑛.UHPC-NC界面结合状态研究[J].宁波大学学报(理工版),2025,38(3):9-15.DOI:10.20098/j.cnki.1001-5132.2024.1120
LI Mengmeng,YANG Heng,HUANG Yichang,LI Zhe,CHEN Jiangying.Research on the interface bonding state of UHPC-NC[J].Journal of Ningbo University(Natural Science & Engineering Edition),2025,38(3):9-15.DOI:10.20098/j.cnki.1001-5132.2024.1120
| Title: | Research on the interface bonding state of UHPC-NC |
| 作者: | 李萌萌, 杨 恒, 黄一昶, 李 哲, 陈江瑛 |
| Author(s): | LI Mengmeng, YANG Heng, HUANG Yichang, LI Zhe, CHEN Jiangying |
| 关键词: | 超高性能混凝土-普通混凝土组合体; 界面结合强度; 应变率; 分离式霍普金森压杆 |
| Keywords: | Ultra-High Performance Concrete-Normal Concrete (UHPC-NC) combinations; interfacial bonding strength; strain rate; Split Hopkinson Pressure Bar (SHPB) |
| 分类号: | TU528 |
| DOI: | 10.20098/j.cnki.1001-5132.2024.1120 |
| 文献标识码: | A |
| 摘要: | 为研究超高性能混凝土-普通混凝土(Ultra-High Performance Concrete-Normal Concrete, UHPC-NC)组合体的界面结合强度, 设计并制作了3种工况的组合体试件: 浇筑间隔分别为30 min、1d固化及1d固化+48h 90℃高温蒸汽养护试件。采用分离式霍普金森压杆(SHPB)装置和电液伺服万能试验机对3种不同工况的UHPC-NC组合体进行动态界面、静态界面结合强度测试, 测试采用巴西圆盘劈裂法。结果表明: 浇筑间隔30min的试件在动态荷载、静态荷载下的黏结强度最强, 其次是1d固化及1d固化+48h 90℃高温蒸汽养护的试件; 浇筑间隔为30min的试件裂纹产生于NC端, 而另外2种试件裂纹产生于UHPC-NC界面, 说明前者的薄弱环节在NC端, 而后两者的薄弱环节在UHPC-NC界面处; 3种UHPC-NC组合体的结合强度都随应变率的升高而增强, 表现出明显的应变率效应。 |
| Abstract: | To investigate the interfacial bonding strength of ultra-high performance concrete and normal concrete (UHPC-NC) combinations, specimens are designed and fabricated with three different curing conditions, including a pouring interval of 30 minutes, 1 day curing period, and 1 day curing followed by 48 hours of high-temperature steam curing at 90℃, respectively. The bonding strength under dynamic and static loading conditions is tested by using the split Hopkinson pressure bar (SHPB) device and an electro-hydraulic servo universal testing machine, with the Brazilian disc splitting method being employed. The results indicate that the specimens with a pouring interval of 30 minutes exhibit the highest bonding strength under both dynamic and static loads, followed by those with a 1 day curing and finally the specimens subjected to 48 hours of high-temperature steam curing. Crack initiation in the 30 minutes interval specimens occurs at the NC end, while cracks in the other two types initiate at the UHPC-NC interface, indicating that the weak points are at the NC end in the former and at the UHPC-NC interface in the latter two. Moreover, the bonding strength of all three UHPC-NC combinations increases with the increase of strain rate, demonstrating a significant strain rate effect. |
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| 备注/Memo: | 收稿日期: 2024−11−21 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 宁波市科技创新2025重大项目（2022Z209）; 国家自然科学基金（11572163, 11832013） 第一作者: 李萌萌, 硕士研究生, 主要研究方向: UHPC动态力学性能。E-mail: 2211090017@nbu.edu.cn *通信作者: 陈江瑛, 博士/教授, 主要研究方向: 冲击动力学。E-mail: chenjiangying@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
