Repair and rehabilitation of damaged RC beams using plate bonding technique

摘要

The use of cementetious composites for Infrastructure applications is becoming more popular with the introduction of new high performance materials. Ferrocement laminates are introduced to enhance the overall performance of reinforced concrete (RC) structures. This study presents a method for repairing and rehabilitating damaged RC beams above the original capacity level using ferrocement laminates which were directly glued into the cracked tension face of the beam by epoxy adhesives. A total of 16 beams of size 125 mm X 250 ram X 3200 mm with effective span 3000 mm were cast and tested. Four of them were perfect beams (BP1 - BP4). The damage due to overloading was achieved in terms of ultimate load carrying capacity (P_u,) of the perfect beams. Twelve beams (BOR1-BOR12) were damaged under overloading by applying 80 percent P_u and 90 percent P_u six of them in each category. Then these were repaired and rehabilitated by using ferrocement laminates with three different volume fraction (V_r = 2 percent, 3 percent and 4 percent) of reinforcement, two beams in each category. Static and dynamic tests were conducted on all the beams to evaluate the flexural and dynamic properties. A non-linear analysis using ANSYS software has been performed to get the load-deflection and load-strain behaviour for perfect and rehabilitated beams. Results showed a close agreement between the numerical solution and experimental values.