This study aims to explore and optimize the design space of atmospheric-pressure plasma (APP) to improve nano-silica (NS) deposition onto carbon rovings and its bond compatibility with ultra-high-performance concrete (UHPC). APP treatment primarily led to surface functionalization and sizing removal without significantly modifying the surface microstructure and bulk material properties of the carbon rovings. The oxygen-containing functional groups introduced by APP treatment provided more active sites for the adsorption and immobilization of NS particles, further aided by the enlarged direct contact area resulting from sizing removal. The bond strength improvement at the roving/UHPC interfacial transition zone (ITZ) originated from the formation of an intricate network structure of calcium-silicate-hydrate (C–S–H), which promoted chemical and physical bonding interactions at the ITZ to varying extents depending on the characteristics of NS deposition. Discussion of the experimental findings led to the development of an approach for determining optimal APP parameters.

中文翻译：

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优化碳粗纱/UHPC 界面粘合的大气压等离子体介导的纳米二氧化硅沉积


本研究旨在探索和优化大气压等离子体（APP）的设计空间，以改善纳米二氧化硅（NS）在碳粗纱上的沉积及其与超高性能混凝土（UHPC）的粘结相容性。 APP 处理主要导致表面功能化和上浆去除，而不会显着改变碳粗纱的表面微观结构和本体材料性能。 APP处理引入的含氧官能团为NS颗粒的吸附和固定提供了更多的活性位点，进一步得益于去除浆料导致的扩大的直接接触面积。粗纱/UHPC界面过渡区（ITZ）的粘合强度的提高源于硅酸钙水合物（C-S-H）复杂网络结构的形成，这促进了ITZ处的化学和物理粘合相互作用的变化其程度取决于 NS 沉积的特征。对实验结果的讨论导致了一种确定最佳 APP 参数的方法的开发。