Repair of heat-damaged reinforced concrete slabs using fibrous composite materials

High performance repairing of reinforced concrete structures

“…Repair and strengthening of existing reinforced concrete (RC) structures is of great interest for extending their service life as well as for their rehabilitation [1]. Repair of concrete structures can be classified as restoring the original structural shape and strengthening the damaged members with inadequate load bearing capacity.…”

Effect of carbon nanotubes on strengthening of RC beams retrofitted with carbon fiber/epoxy composites

“…5 shows that strengthening of RC beams with carbon fiber sheet embedded in neat epoxy (B-NE) increased the ultimate load by 48% compared to the unstrengthened beams. The significant improvement in the flexural strength is referred to the contribution of carbon fiber sheet in increasing the tensile strength at the tension zone of the RC beams [8,50]. The flexural toughness of retrofitted beams B-NE showed a considerable reduction by about 42% compared to control specimens.…”

Flexural Behavior of Fire-Damaged Reinforced Concrete Slabs Repaired with Near-Surface Mounted (NSM) Carbon Fiber Reinforced Polymer (CFRP) Rods

“…When concrete structure are exposed to high temperatures, mechanical losses of its properties take place (Sangluaia 2013). This may result in cracking and loss in the bearing capacity of components (Haddad et al 2011). After fire, concrete suffers a reduction of its strength as well as damage that can be observed at the surface.…”

“…Haddad et al (2011) used carbon FRP (CFRP) and glass FRP (GFRP) sheets to repair heat damaged slabs (heated at 600°C for 2h). Based on the results, the authors concluded that CFRP and GFRP strengthened elements regained up to 158 and 125% of the control slab's ultimate load capacity with a substantial increase in stiffness, first cracking load, with a corresponding decrease in mid-span deflections at ultimate load.…”