Repair of Heat-Damaged RC Shallow Beams Using Advanced Composites

Journal Article
J.,, Shannag, M. . 2007
Publication Work Type: 
Research, Materials and Structures
Pages: 
287-299
Publication Abstract: 

Several repair techniques for restoring the structural capacity of heatdamaged high-strength reinforced concrete shallow beams using advanced composites are proposed. A series of sixteen under-reinforced concrete hidden beams were cast, heated at 600°C for three hours, 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