Strengthening of Corroded Reinforced Concrete Beams Using Ultra-High Performance Concrete (UHPC) and Carbon Fiber Reinforced Polymer (CFRP)

Project: Research

Project Details

Description

The reinforced concrete structures are prone to damage either due to overloading or due to deterioration of the structural materials (concrete or steel or both) that reduces their load-bearing capacities leading towards their failures before completion of the intended service life. Corrosion of steel bars in concrete structures is one of the potential causes of the loss of load-bearing capacity, particularly in case of aggressive exposures like in Saudi Arabia that include chloride or carbonation penetration in presence of high humidity and atmospheric temperature. Attempts have been made to explore the possibility of strengthening the partially damaged reinforced concrete structural members using different materials and techniques. Wrapping up the structural members using Carbon Fiber Reinforced Polymer (CFRP) sheets has been widely reported as an approach to strengthen the partially damaged members. However, in recent years, Ultra-High Performance Concrete (UHPC) has emerged as a new concrete material that is considered by many researchers as an alternative material for strengthening of the partially damaged reinforced concrete structures. UHPC possesses very high strength, excellent durability characteristics, and high bond strength, which make the use of UHPC advantageous for enhancing the load-bearing capacity, durability and overall serviceability of the existing structures. Although, many studies were conducted on using the UHPC for strengthening of Reinforced Concrete (RC) beams, however, almost all the studies focused on strengthening of undamaged RC beams. Limited information is available in the literature regarding the use of UHPC and/or UHPC-CFRP hybrid system for strengthening the partially damaged RC beams particularly due to reinforcement corrosion. In the proposed study, an experimental investigation will be carried out to study the flexural behaviour of the corroded damaged RC beams before and after strengthening them using UHPC and/or UHPC-CFRP hybrid system with a purpose of investigating the effects of strengthening the beam in terms of improvements in the load-bearing capacity and other associated parameters. The key factors affecting the degree of reinforcement corrosion and the effectiveness of UHPC and CFRP strengthening will be considered as the experimental variables. These variables will include the density and duration of the applied current for inducing accelerated reinforcement corrosion, configurations and thicknesses of the UHPC and/or CFRP layers applied on the bottom and side faces of the RC beams as strengthening material. The number of beam specimens to be used for corroding, strengthening and studying the flexural behaviour will be decided through an experiment design considering these variables. The experimental data will be utilized for developing the mechanistic and empirical models for accounting the joint effects of the key factors on the restoration of the load-bearing capacity of the RC beams damaged due to reinforcement corrosion. These models will be helpful in optimizing the thickness of the UHPC and/or CFRP layers to be applied on the bottom and side faces of the corrosion-damaged RC beams. Furthermore, finite element modelling using ABAQUS software will be carried out to capture the flexural behaviour of the strengthened RC beams.
StatusFinished
Effective start/end date1/04/201/10/22

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