Creep of epoxy-clay nanocomposite adhesive at the FRP interface: A multi-scale investigation

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[1] Aboubakr, Sherif H.
[2] Kandil, Usama F.
[3] Reda Taha, Mahmoud
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Reda Taha, M. (mrtaha@unm.edu) | 1600年 / Elsevier Ltd卷 / 54期
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Externally bonded FRP laminates are widely used for strengthening structures due to their high strength-to-weight ratio and extended durability. However; creep of epoxy adhesives at the FRP interface has been reported; creating a concern about the efficiency of the FRP strengthening with time. Nanoclay platelets have been suggested to control creep of epoxy adhesives at the FRP interface. A multi-scale experimental investigation of creep of the epoxy-clay nanocomposite was performed. This investigation included examining macrocreep of epoxy at the FRP-steel interface using double lap shear test set-up; followed by investigating nanocreep of the epoxy-clay nanocomposite using nanoindentation. Microstructural characterizations including X-ray diffraction (XRD); transmission electron microscope (TEM); differential scanning calorimetry (DSC); 29Si nuclear magnetic resonance (NMR); Fourier transform infrared spectroscopy (FTIR); and Raman spectroscopy of the epoxy-clay nanocomposite were performed. Nanoclay platelets dispersion; intercalation or exfoliation was found to significantly affect creep of epoxy. Exfoliated nanoclay was found to reduce epoxy cross-linking and thus increase creep. However; agglomeration of intercalated nanoclay platelets allowed them to work as micro-particulate reinforcement in the epoxy matrix and therefore reduce epoxy-chain mobility and limit creep. Such complexity in behavior does not allow upscaling creep behavior of epoxy-clay nanocomposites from nano to macroscale. © 2014 Elsevier Ltd;
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