电泳沉积
水合硅酸钙
胶凝的
材料科学
粘结强度
复合材料
水泥
扫描电子显微镜
纤维
重量分析
沉积(地质)
极限抗拉强度
化学工程
Zeta电位
纳米颗粒
纳米技术
化学
有机化学
涂层
胶粘剂
生物
图层(电子)
古生物学
沉积物
工程类
作者
Huanyu Li,Marco Liebscher,Iurie Curosu,Soumyadip Choudhury,Simone Hempel,Maliheh Davoodabadi,Tin Trong Dinh,Jian Yang
标识
DOI:10.1016/j.cemconcomp.2020.103777
摘要
Nano-silica (NS) is deposited onto Carbon fibers (CFs) using electrophoretic deposition (EPD) to improve their bond to cementitious matrices. Two different voltage ranges and two deposition times were applied. The mobility of the negatively charged NS-colloids in deionized water in a controlled electric field was proven by zeta potential measurements and cyclic voltammetry (CV). Scanning electron microscopy and energy dispersive X-ray analysis (EDX) showed homogeneously distributed nano-silica particles on the surfaces of the CF. Thermo-gravimetric analysis (TGA) and single-fiber tensile tests were conducted to assess the impact of the parameters under investigation on the CF properties. Single-fiber pullout tests from a cement-based matrix showed markedly enhanced bond strength of the modified filaments, indicating improved reinforcing action of CF in cementitious composites. Storing the modified fibers in a cement pore solution showed that nano-silica deposits act as nucleating seeds for building calcium silicate hydrate (C–S–H) and calcite. This explains the enhanced bond properties.
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