Grooving Method to Postpone Debonding of FRP Sheets Used for Shear Strengthening
One of the most common practices for strengthening
the reinforced concrete structures is the application of FRP (Fiber
Reinforce Plastic) sheets to increase the flexural and shear strengths
of the member. The elastic modulus of FRP is considerably higher
than that of concrete. This will result in debonding between the FRP
sheets and concrete surface. With conventional surface preparation of
concrete, the ultimate capacity of the FRP sheets can hardly be
achieved. New methods for preparation of the bonding surface have
shown improvements in reducing the premature debonding of FRP
sheets from concrete surface. The present experimental study focuses
on the application of grooving method to postpone debonding of the
FRP sheets attached to the side faces of concrete beams for shear
strengthening. Comparison has also been made with conventional
surface preparation method. This study clearly shows the efficiency
of grooving method compared to surface preparation method, in
preventing the debonding phenomenon and in increasing the load
carrying capacity of FRP.
[1] ACI 440R, (2004), State-of-the-art report on fiber reinforced plastic
reinforcement for concrete structures, American Concrete Institute
Committee 440.
[2] Karbhari, V. M., and Zhao, L. (1998), Issues related to composite
plating and environmental exposure effects on composite-concrete
interface in external strengthening, Composite Structures, Vol. 40, No.
3, pp. 293-304.
[3] Toutanji, H., and Ortez, G., (2001), "The effect of surface preparation on
bond interface between sheets and concrete members," Composite
structures, Vol. 53, pp. 457-462.
[4] De Lorenzis, L. and Teng, J.G., (2007), "Near-surface mounted FRP
reinforcement:An emerging technique for strengthening structures,"
Composites, part B, Vol. 38, pp. 119-143.
[5] Rizzo, A. and De Lorenzis, L., (2009), "Behavior and capacity of RC
beams strengthened in shear with NSM FRP reinforcement,"
Construction and Building Materials, Vol. 23, pp. 1555-1567.
[6] Mostofinejad, D., and Mahmoudabadi, E., (2010), "Grooving as
Alternative of Surface Preparation to Postpone Debonding of FRP
Lamination in Concrete Beams," Journal of Composites for
Construction, Vol. 14, No. 6, pp. 804-811.
[7] ACI Committee 211," Standard Practice for Selecting Proportions for
Normal, Heavyweight, Mass concrete", Farmington Hills, MI: American
Concrete Institute; 2009.
[1] ACI 440R, (2004), State-of-the-art report on fiber reinforced plastic
reinforcement for concrete structures, American Concrete Institute
Committee 440.
[2] Karbhari, V. M., and Zhao, L. (1998), Issues related to composite
plating and environmental exposure effects on composite-concrete
interface in external strengthening, Composite Structures, Vol. 40, No.
3, pp. 293-304.
[3] Toutanji, H., and Ortez, G., (2001), "The effect of surface preparation on
bond interface between sheets and concrete members," Composite
structures, Vol. 53, pp. 457-462.
[4] De Lorenzis, L. and Teng, J.G., (2007), "Near-surface mounted FRP
reinforcement:An emerging technique for strengthening structures,"
Composites, part B, Vol. 38, pp. 119-143.
[5] Rizzo, A. and De Lorenzis, L., (2009), "Behavior and capacity of RC
beams strengthened in shear with NSM FRP reinforcement,"
Construction and Building Materials, Vol. 23, pp. 1555-1567.
[6] Mostofinejad, D., and Mahmoudabadi, E., (2010), "Grooving as
Alternative of Surface Preparation to Postpone Debonding of FRP
Lamination in Concrete Beams," Journal of Composites for
Construction, Vol. 14, No. 6, pp. 804-811.
[7] ACI Committee 211," Standard Practice for Selecting Proportions for
Normal, Heavyweight, Mass concrete", Farmington Hills, MI: American
Concrete Institute; 2009.
@article{"International Journal of Architectural, Civil and Construction Sciences:52797", author = "Davood Mostofinejad and Seyed Amirali Mostafavizadeh and Amirhomayoon Tabatabaei Kashani", title = "Grooving Method to Postpone Debonding of FRP Sheets Used for Shear Strengthening", abstract = "One of the most common practices for strengthening
the reinforced concrete structures is the application of FRP (Fiber
Reinforce Plastic) sheets to increase the flexural and shear strengths
of the member. The elastic modulus of FRP is considerably higher
than that of concrete. This will result in debonding between the FRP
sheets and concrete surface. With conventional surface preparation of
concrete, the ultimate capacity of the FRP sheets can hardly be
achieved. New methods for preparation of the bonding surface have
shown improvements in reducing the premature debonding of FRP
sheets from concrete surface. The present experimental study focuses
on the application of grooving method to postpone debonding of the
FRP sheets attached to the side faces of concrete beams for shear
strengthening. Comparison has also been made with conventional
surface preparation method. This study clearly shows the efficiency
of grooving method compared to surface preparation method, in
preventing the debonding phenomenon and in increasing the load
carrying capacity of FRP.", keywords = "FRP composite, grooving, rehabilitation, reinforced
concrete, shear strengthening, surface preparation.", volume = "6", number = "12", pages = "1062-5", }