纳米改性环氧增强CFRP-UHPC界面粘结性能
Bond performance of CFRP–UHPC interfaces enhanced by nano-modified epoxy resin
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摘要: 针对碳纤维增强聚合物(CFRP)加固体系中界面粘结性能不足以及超高性能混凝土(UHPC)致密表面不利于传统粘结体系协同受力的问题,本文设计 18 个 CFRP-UHPC 界面试件(包含 4 个对比试件)开展单面剪切试验,分析了界面破坏模式、荷载–滑移关系、CFRP 应变及剪应力分布规律,揭示了 CFRP 粘结长度、CFRP 层数及粘结剂类型对界面粘结性能的参数影响规律,并阐明了 MMT/SiO2 纳米改性环氧作用下 CFRP-UHPC 界面增强机制。结果表明:CFRP-UHPC 界面破坏以剥离失效为主,但 UHPC 中钢纤维桥联作用可抑制裂缝扩展,使界面损伤呈渐进演化特征;荷载–滑移曲线整体表现出明显的峰后软化特征,界面仍具有一定的变形与耗能能力;随着粘结长度由 120 mm 增至 160 mm,界面极限承载力与极限滑移分别平均提高 37.7%和 41.1%。进一步增加至 200 mm 时,其增幅降至 23.3%和 17.0%,表明界面存在明显有效粘结长度;增加 CFRP 层数能够提高界面极限承载力,但会加剧加载端应力集中,使界面更早进入损伤软化阶段;相比普通环氧体系,MMT/SiO2 纳米改性环氧显著改善界面协同变形能力,使界面极限承载力与极限滑移平均提高40.9%和31.7%;界面应变与剪应力沿粘结长度呈非线性衰减分布,UHPC 体系具有更长的有效传力区间与更均匀的应变分布。建立了基于断裂能的 CFRP-UHPC 界面承载力计算模型,计算结果与试验值吻合良好,研究结果可用于界面承载性能分析和结构复合加固设计。Abstract: To address the insufficient interfacial bond performance in conventional carbon fiber-reinforced polymer (CFRP) strengthening systems and the incompatibility between traditional adhesives and the dense surface of ultra-high-performance concrete (UHPC), eighteen CFRP–UHPC interface specimens (including four control specimens) were tested under single-lap shear loading. The interfacial failure mode, load–slip response, CFRP strain distribution, and interfacial shear stress transfer were investigated, together with the effects of bond length, CFRP layers, and adhesive type. The enhancement mechanism of MMT/SiO2 nano-modified epoxy was further clarified.The results indicate that interfacial debonding is the dominant failure mode, while the steel fiber bridging effect in UHPC suppresses crack propagation and results in progressive damage evolution. The load–slip curves exhibit evident post-peak softening behavior with considerable deformation and energy dissipation capacity. Increasing the bond length from 120 to 160 mm increases the ultimate load and ultimate slip by 37.7% and 41.1%, respectively, whereas further increasing the bond length to 200 mm reduces the corresponding increments to 23.3% and 17.0%, indicating a pronounced effective bond length. Increasing CFRP layers enhances the interfacial load capacity but aggravates stress concentration near the loading end, thereby accelerating interfacial softening. Compared with conventional epoxy, the MMT/SiO2 nano-modified epoxy improves the interfacial cooperative deformation capacity, resulting in average increases of 40.9% and 31.7% in ultimate load and ultimate slip, respectively. The interfacial strain and shear stress exhibit nonlinear attenuation along the bond length, and the UHPC system presents a longer effective stress transfer zone and more uniform strain distribution. Finally, a fracture energy-based model for predicting the CFRP–UHPC interfacial capacity was established, and the predicted results agreed well with the experimental data, providing support for interfacial performance evaluation and composite strengthening design.
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