Repair of heat-damaged RC shallow beams using advanced composites |
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Authors: | Rami H Haddad M Jamal Shannag Alaa Moh’d |
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Affiliation: | (1) Department of Civil Engineering, Jordan University of Science & Technology, Irbid, Jordan;(2) Department of Civil Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia |
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Abstract: | Several repair techniques for restoring the structural capacity of heat-damaged high-strength reinforced concrete shallow
beams using advanced composites are proposed. A series of 16 under-reinforced concrete hidden beams were cast, heated at 600°C
for 3 h, repaired, and then tested under four point-loading. Tests were conducted to study the effectiveness of externally
applied composite materials on increasing the flexural capacity of beams. The composites used include high strength fiber
reinforced concrete jackets; ferrocement laminates; and high-strength fiber glass sheets. The beams repaired with steel and
high performance polypropylene fiber reinforced concrete jackets regained up to 108 and 99% of the control beams’ ultimate
load capacity, with a corresponding increase in stiffness of up to 104 and 98%, respectively. The beams repaired with fiber
glass sheets and ferrocement meshes regained up to 126 and 99% of the control beams’ ultimate load capacity, with a corresponding
increase in stiffness of up to 160 and 156%, respectively. Most of the beams repaired showed a typical flexural failure with
very fine and well-distributed hairline cracks in the constant moment region. |
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Keywords: | Repair Heat-damaged beams Fiber Concrete |
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