Abstract
Today, using Fiber Reinforced Polymer (FRP) sheets is one of the conventional methods in retrofitting concrete structures. Some factors affecting FRP sheets proper performance include mechanical properties, surface specifications, connector’s material and connecting approach in concrete elements. Previous studies showed that FRP epoxy resin and its basic surface have a significant impact on the ultimate bearing capacity. In line with the development of nanotechnology in recent years, this paper presents an experimental study to show the effects of adding the best percentage of nano-carbons to adhesive resin and evaluate the ultimate axial, shear and bending strengths in concrete samples. The results show that using FRP with carbon nanotube reinforced resins will significantly increase stiffness and ductility by 100%; moreover, it shows an effective increase of almost 13% in axial and flexural strengths of specimens.
Highlights
Improving the structural safety against the loads has always been one of the significant issues for structural engineering in existing structures and future ones
Flexural test indirectly evaluates the tensile strength of concrete. It tests the ability of unreinforced concrete beam and RCFRP and RCFRPME beams to withstand failure in bending
For RCFRP in the tension side of the middle beam, tension-shearing cracks extended towards the supports, high tension-shear cracks happened in Fiber Reinforced Polymer (FRP) resins and FRP fibers have separated from the concrete; crashing occurred in the compression side
Summary
Improving the structural safety against the loads has always been one of the significant issues for structural engineering in existing structures and future ones. Various studies show that adding CNTs to epoxy with carbon fiber composites can significantly improve the contact mechanical specifications It means that while the sheet separates from the concrete surface, the concrete strength increases, so a higher volume of concrete contribute with FRP fibers [32]. Since it seems that with improvements in the performance of epoxy, the mechanism of load path between the different layers and the efficiency will increase, in this paper a new experimental research is performed using CNTs in epoxy as an adhesive agent and focusing on the integrated performance of concrete component and FRP, the mechanical strength of specimens such as axial strength, flexural strength and shear strength and the applied results were obtained. The objective of present paper is to exclusively evaluate the mechanical/structural properties after adding CNTs to epoxy
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