Behaviour of CFRP Reinforced Low-Strength Concretes Subjected to Temperature Changes and Sustained Loads

Abstract eng:
After the catastrophic earthquakes in Turkey, it was realized that most of the concrete buildings at seismically active regions do not have adequate strength and ductility. In order to make those buildings survive during major earthquakes, they need to be seismically retrofitted. One alternative strengthening technique is the use of carbon fiber reinforced plastic (CFRP) wrapping technique. CFRP has a high tensile strength, a high modulus and is also light in weight and easy to handle. Although, CFRP applications are gaining popularity in seismic retrofitting, their long term behavior is still not very well known. While strengthening of the buildings with CFRP several layers of epoxy based adhesives are used. Those layers of materials as well as CFRP wrapped concrete may therefore be affected by different stress levels and environmental changes. In this study, the behavior of CFRP wrapped low strength (10 MPa) cylindrical concrete specimens (150x300 mm) are investigated when they are subjected to the compressive loads and temperature changes to determine the possible changes in strength and ductility. Sustained loads that are applied on cylinders are determined as the 40 % of their maximum strength. In addition to sustained loads, specimens are subjected to 200 temperature cycles, changing between -10°C to 50°C. In order to better understand the behavior of the CFRP wrapped concrete cylinders, specimens are divided in three groups. In each group mechanical characteristics are investigated to determine the effects of temperature changes, and sustained loads. This study presents the results of this ongoing project.

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