Repair of Heat-Damaged RC Slabs using Fibrous
Construction and Building Materials 25 (2011) 1213–1221
Contents lists available at ScienceDirect
Construction and Building Materials journal homepage: www.elsevier.com/locate/conbuildmat
Repair of heat-damaged reinforced concrete slabs using fibrous composite materials
R.H. Haddad a,⇑, N. AL-Mekhlafy a, A.M. Ashteyat b a b
Civil Engineering Department, Jordan University of Science & Technology, P.O. Box 3030, Irbid 22110, Jordan
Civil Engineering, Applied Science University, Shafabadran, Amman, Jordan
a r t i c l e
i n f o
Article history:
Received 24 October 2009
Received in revised form 14 August 2010
Accepted 2 September 2010
Available online 4 November 2010
Keywords:
Heat-damaged concrete slabs
Repair
Fibrous grout
a b s t r a c t
Sixteen under-reinforced high strength concrete one-way slabs were cast, heated at 600 °C for 2 h, repaired, and then tested under four-point loading to investigate the coupling effect of water recuring and repairing with advance composite materials on increasing the flexural capacity of heat-damaged slabs. The composites used included high strength fiber reinforced concrete layers; and carbon and glass fiber reinforced polymer (CFRP and GFRP) sheets. Upon heating then cooling, the reinforced concrete (RC) slabs experienced extensive map cracking, and upward cambering without spalling. Recuring the heatdamaged slabs for 28 days allowed recovering the original stiffness without achieving the original load carrying capacity. Other slabs, recured then repaired with steel fiber reinforced concrete (SFRC) layers, regained from 79% to 84% of the original load capacity with a corresponding increase in stiffness from
382% to 503%, whereas those recured then repaired with CFRP and GFRP sheets, regained up to 158% and 125% of the original load capacity with a corresponding increase in stiffness of up to 319% and
197%, respectively. Control, heat-damaged, and water recured slabs showed a typical
Contents lists available at ScienceDirect
Construction and Building Materials journal homepage: www.elsevier.com/locate/conbuildmat
Repair of heat-damaged reinforced concrete slabs using fibrous composite materials
R.H. Haddad a,⇑, N. AL-Mekhlafy a, A.M. Ashteyat b a b
Civil Engineering Department, Jordan University of Science & Technology, P.O. Box 3030, Irbid 22110, Jordan
Civil Engineering, Applied Science University, Shafabadran, Amman, Jordan
a r t i c l e
i n f o
Article history:
Received 24 October 2009
Received in revised form 14 August 2010
Accepted 2 September 2010
Available online 4 November 2010
Keywords:
Heat-damaged concrete slabs
Repair
Fibrous grout
a b s t r a c t
Sixteen under-reinforced high strength concrete one-way slabs were cast, heated at 600 °C for 2 h, repaired, and then tested under four-point loading to investigate the coupling effect of water recuring and repairing with advance composite materials on increasing the flexural capacity of heat-damaged slabs. The composites used included high strength fiber reinforced concrete layers; and carbon and glass fiber reinforced polymer (CFRP and GFRP) sheets. Upon heating then cooling, the reinforced concrete (RC) slabs experienced extensive map cracking, and upward cambering without spalling. Recuring the heatdamaged slabs for 28 days allowed recovering the original stiffness without achieving the original load carrying capacity. Other slabs, recured then repaired with steel fiber reinforced concrete (SFRC) layers, regained from 79% to 84% of the original load capacity with a corresponding increase in stiffness from
382% to 503%, whereas those recured then repaired with CFRP and GFRP sheets, regained up to 158% and 125% of the original load capacity with a corresponding increase in stiffness of up to 319% and
197%, respectively. Control, heat-damaged, and water recured slabs showed a typical