Jing Fan, Wang Rui, Zhao Ruikang, Li Chenxuan, Cai Jun, Ding Guowei, Wang Qingjun, Xie Hongfeng
MOE Key Laboratory of High Performance Polymer Materials and Technology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
Department of Chemistry, Texas A&M University, College Station, TX 77843-3255, USA.
Polymers (Basel). 2023 Jan 12;15(2):412. doi: 10.3390/polym15020412.
Improving bonding and mechanical strengths is important for the application of bond coats used in the construction of steel deck bridges. Graphene nanoplatelets (GNPs) are attractive nanofillers for polymer modification because of their low cost, ultra-high aspect ratio, and extraordinary thermal and mechanical performance. In this paper, GNPs were used to reinforce the epoxy asphalt bond coat (EABC). The morphology, viscosity-time behavior, contact angle, dynamic mechanical properties, and mechanical and bonding strengths of GNP-reinforced EABCs were investigated using laser confocal microscopy, a Brookfield rotational viscometer, a contact angle meter, dynamic mechanical analysis, a universal test machine, and single-lap shear and pull-off adhesion tests. GNP dispersed non-uniformly in the asphalt phase of EABC. The viscosity of the neat EABC was lowered with the inclusion of GNPs and thus the allowable construction time was extended. The existence of GNPs enhances the hydrophobicity of the neat EABC. When adding more than 0.2% GNP, the storage modulus, crosslinking density and glass transition temperatures of both asphalt and epoxy of the neat EABC increased. The mechanical and bonding properties of the neat EABC were greatly enhanced with the incorporation of GNPs. Furthermore, the mechanical and bonding strengths of the modified EABCs increased with the GNP content. GNP-reinforced EABCs can be utilized in the pavement of long-span steel bridges with long durability.
提高粘结强度和机械强度对于钢桥面板桥梁建设中使用的粘结层的应用至关重要。石墨烯纳米片（GNPs）因其低成本、超高的纵横比以及卓越的热性能和机械性能，是聚合物改性中极具吸引力的纳米填料。本文中，GNPs被用于增强环氧沥青粘结层（EABC）。使用激光共聚焦显微镜、布鲁克菲尔德旋转粘度计、接触角测量仪、动态力学分析、万能试验机以及单搭接剪切和拉拔附着力试验，研究了GNP增强EABC的形态、粘度-时间行为、接触角、动态力学性能以及机械和粘结强度。GNP在EABC的沥青相中分散不均匀。加入GNPs后，纯EABC的粘度降低，从而延长了允许的施工时间。GNPs的存在增强了纯EABC的疏水性。当添加超过0.2%的GNP时，纯EABC的沥青和环氧树脂的储能模量、交联密度和玻璃化转变温度均升高。加入GNPs后，纯EABC的机械性能和粘结性能得到极大增强。此外，改性EABC的机械强度和粘结强度随GNP含量的增加而提高。GNP增强的EABC可用于具有长耐久性的大跨度钢桥路面。
