Szewczak Andrzej
Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-619 Lublin, Poland.
Materials (Basel). 2021 Oct 23;14(21):6339. doi: 10.3390/ma14216339.
Strengthening structural concrete, steel or wooden elements with reinforcement tapes is currently a popular method of extending the durability of buildings. In the glued joint Carbon Fibre Reinforced Polymer (CFRP) tape-concrete substrate, the most critical element is the adhesive layer connecting both materials. The glued joint participates in the transfer of stresses between the reinforced element and the reinforcement tape. Among the numerous analyses of this type of joint, the work resulting from the action of shear stresses (shearing) is considered most frequently, which also results from the originally developed computational models emerging with the development of research on the processes of adhesive effectiveness. The subsequent theories considered the share of other stresses, which is also related to the complex nature of the phenomenon of glue adhesion on various surfaces. Research shows the possibility of modifying the adhesion of the glue by altering its composition and the target surface of application. The study contains the results of research on the possibility of changing the adhesion of the glue to a concrete surface prepared by grinding and sandblasting. The selected epoxy resin has been modified by using the additives of microsilica and carbon nanotubes. Effective mixing of ingredients was achieved due to the use of sonication in the mixing process. Then, the adhesives prepared in this way were used to stick fragments of CFRP tape to concrete surfaces: cleaned, ground and sandblasted. A modified version of the pull-off test was used to determine the effectiveness of adhesion the CFRP tapes to concrete. The results are the final stage summarizing a series of studies including other parameters affecting the bonding efficiency and durability of adhesive bonds.
用加固胶带增强结构混凝土、钢材或木质构件，是目前延长建筑物耐久性的一种常用方法。在碳纤维增强聚合物（CFRP）胶带与混凝土基材的粘结接头中，最关键的部分是连接两种材料的粘结层。粘结接头参与了增强构件与加固胶带之间的应力传递。在对这类接头的众多分析中，由剪应力（剪切）作用产生的研究最为常见，这也是随着粘结有效性过程研究的发展而最初开发的计算模型所导致的。后续理论考虑了其他应力的占比，这也与胶水在各种表面上粘结现象的复杂性有关。研究表明，通过改变胶水的成分和目标应用表面，可以改变胶水的粘结力。该研究包含了关于改变胶水与通过打磨和喷砂处理的混凝土表面之间粘结力可能性的研究结果。所选环氧树脂已通过使用微硅粉和碳纳米管添加剂进行了改性。由于在混合过程中使用了超声处理，实现了成分的有效混合。然后，将以此方式制备的胶粘剂用于将CFRP胶带碎片粘贴到混凝土表面：清洁、打磨和喷砂处理过的表面。采用改良版的拉拔试验来确定CFRP胶带与混凝土之间的粘结有效性。这些结果是一系列研究的最后阶段总结，这些研究还包括影响粘结效率和粘结耐久性的其他参数。
