Constructional Polymers and Composites Research Lab., School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology (IUST), Tehran, Iran.
Sci Rep. 2023 Jun 6;13(1):9157. doi: 10.1038/s41598-023-36462-0.
Anchoring steel rebar in concrete structures is a common method in the building and construction industry. This research focuses on improving the mechanical/bonding properties of the prepared epoxy nanocomposite adhesive using surface treatment of SiO nano fillers by glycidoxypropyltrimethoxysilane (GPTMS). For this purpose, the nano silica particles were silanized via a facile sol-gel method at silane concentrations of 1, 5, 10 and 20X (i.e. X is stoichiometric silane concentration). The nanoparticles were characterized carefully by FTIR, TGA, XRD and XPS techniques. It was found that the highest GPTMS grafting ratio was obtained at silane concentration of 10X. The pure and silanized nanoparticles were added to a two-pack epoxy resin and were compared for tensile and compressive properties. It was found that surface modification of nano silica caused improvement in the strength, modulus, compressive strength and compressive modulus by 56, 81, 200 and 66% compared to the pristine epoxy adhesive and also 70, 20, 17 and 21% compared to the pure nano silica containing adhesive. It also caused 40 and 25% improvement in the pullout strength, 33 and 18% enhancement in the pullout displacement and 130 and 50% in adhesion energy compared to the pristine and raw silica-containing adhesives, respectively.
在混凝土结构中锚固钢筋是建筑和施工行业中常见的方法。本研究专注于通过硅烷化处理 SiO2 纳米填料来改善所制备的环氧纳米复合材料胶的机械/粘结性能。为此，纳米二氧化硅颗粒通过简便的溶胶-凝胶法在硅烷浓度为 1、5、10 和 20X（即 X 是化学计量的硅烷浓度）下进行硅烷化处理。通过 FTIR、TGA、XRD 和 XPS 技术对纳米颗粒进行了仔细的表征。结果发现，在硅烷浓度为 10X 时，接枝率最高。将纯纳米颗粒和硅烷化纳米颗粒添加到双组分环氧树脂中，并对其拉伸和压缩性能进行了比较。结果发现，与原始的环氧胶粘剂相比，纳米二氧化硅的表面改性使强度、模量、抗压强度和抗压模量分别提高了 56%、81%、200%和 66%，与含有纯纳米二氧化硅的胶粘剂相比，分别提高了 70%、20%、17%和 21%。与原始和含有未处理二氧化硅的胶粘剂相比，其拔出强度分别提高了 40%和 25%，拔出位移分别提高了 33%和 18%，粘附能分别提高了 130%和 50%。
