This research is a contribution to work on strengthening and repair of reinforced concrete structures, it presents a comparative study between two methods of repairing damaged concrete with an experimental investigation on the behavior of specimens initially pre-damaged up to intense cracking, repaired by increased concrete section and by bonding a carbon fiber reinforced polymer. In our study, the concrete columns with square sections of (15 × 15) cm2 and a height of 30 cm are tested under uniaxial compression loading up the damage, these columns have been repaired, using both methods, they are tested again and their behavior has been studied. Based on the criterion of Mohr–Coulomb failure, a model was developed for each method to validate the different results obtained experimentally. The experimental results show that the method to repair damaged concrete by carbon fiber reinforced polymer has a good substrate adhesion, which offered a great improvement in strength and ductility compared to the method by increased concrete section. The experimental results have been compared with the theoretical models, a good correlation was obtained.
DritsosSPKotsiraE. Effectiveness of flexural strengthening of RC members. J Construct Build Mater1995; 9(3): 165–172.
2.
Etman EE. Repair of concrete beams using carbon fibre reinforced polymer composite. PhD Dissertation, University of Leeds, UK, 1999.
3.
Meier U and Kaiser H. Strengthening of structures with CFRP laminates. In: Proceedings of the specialty conference: advanced composite materials in civil engineering structures, ASCE, Las Vegas, NV, 1991, pp.224–232.
4.
SaadatmaneshH. Fiber composite for new existing structures. ACI Struct J1994; 91(3): 346–354.
5.
Ehsani MR. Strengthening of earthquake-damaged structures with composite materials. In: Proceedings of the second international RILEM symposium (FRPRCS-2): non-metallic (FRP) reinforcement for concrete structures (ed L Taerwe), Ghent, Belgium, 23–25 August 1995, pp.616–623.
6.
SaadatmaneshHEhsaniMRJinL. Repair of earthquake-damaged RC columns with FRP wraps. ACI Struct J1997; 94(2): 206–214.
7.
LiGHedlundSPangS-S. Repair of damaged RC columns using fast curing FRP composites. Compos Pt B, Eng2003; 34(3): 261–271.
8.
MasiaMJShriveNG. Carbon fiber reinforced polymer wrapping for the rehabilitation of masonry columns. Can J Civ Eng2003; 30: 734–744.
9.
LiY-FLinY-JChenC-W. Theoretical and experimental studies on repaired and rehabilitated reinforced concrete frames. Can J Civ Eng2007; 34: 923–933.
10.
OzcanOBiniciBCanbayE. Repair and strengthening of reinforced concrete columns with CFRPs. J Reinforc Plast Compos2010; 29(22): 3411–3424.
11.
Dreux G and Festa J. Nouveau guide du béton et de ses constituants. Eyrolles, 8ème Edition, Paris, 1998.
12.
Benzaid R, Mesbah H and Chikh NE. FRP-confined concrete cylinders: axial compression experiments and strength model. J Reinforc Plast Compos 2010; 29(16): 2469–2488.
13.
Si Youcef Y, Amziane S and Chemrouk M. Geometrical effect on the behavior of CFRP confined and unconfined concrete columns. J Reinforc Plast Compos 2010; 29(17): 2621–2635.
14.
Croston T. Etude expérimentale du comportement d’une poutre en béton arme en flexion 3 points réparée par matériaux composites (approche probabiliste). Thèse de doctorat, France: Ecole Nationale Supérieure d'Arts et Métiers Centre de Bordeaux, 2006.
15.
ParkRPaulayTReinforced concrete structures, New York, NY: John Wiley and Sons, 1975; 21–23.
16.
WuGWUZSLuZT. Design-oriented stress-strain model for concrete prisms confined with FRP composites. J Construct Build Mater2007; 21: 1107–1121.
17.
Lam L and Teng JG. Design-oriented stress-strain model for FRP-confined concrete in rectangular columns. J Reinforc Plast Compos 2003; 22: pp.1149–1186.
18.
BenzaidRChikhNEMesbahH. Behaviour of square concrete column confined with GFRP composite wrap. J Civil Eng Manage2008; 14(2): 115–120.
19.
BenzaidRMesbahHChikhNE. Study of the compressive behavior of short concrete columns confined by fiber reinforced composite. Arabian J Sci Eng2009; 34(1B): 15–26.
20.
MirmiranAShahawyMSamaanM. Effect of column parameters on FRP-confined concrete. Am Soc Civil Eng, J Compos Construct1998; 2(4): 175–185.
21.
RochettePLabossiereP. Axial testing of rectangular column models confined with composites. Am Soc Civil Eng, J Compos Construct2000; 4(3): 129–136.
22.
Chikh NE, Benzaid R, Bousalem B, et al. Strengthening of high-strength concrete columns with external glass fibre composite. In: Proceedings of the tenth Arab structural engineering conference, Kuwait, 13–15 November 2006, pp.581–588.
23.
YoucefMNFengMQMosallemAS. Stress-strain model for concrete confined by FRP composites. Compos: Pt B2007; 38: 614–628.
24.
MasiaMJGaleTNShriveNG. Size effects in axially loaded square-section concrete prisms strengthened using carbon fibre reinforced polymer wrapping. Can J Civ Eng2004; 31: 1–13.
25.
CampioneGMiragliaN. Strength and strain capacities of concrete compression members reinforced with FRP. Cement Concrete Compos2003; 25: 31–41.
26.
Richart FE, Brandtzaeg A and Brown RL. The failure of plain and spirally reinforced concrete in compression. Bulletin No. 190. Urbana, IL: University of Illinois Engineering Experiment Station, 1929.
27.
KumuthaRVaidyanathanRPalanichamyMS. Behavior of reinforced concrete rectangular columns strengthened using GFRP. Cement Concrete Compos2007; 29: 609–615.
28.
ShehataIAEMCarneiroLAVShehataLCD. Strength of short concrete columns confined with CFRP sheets. Mater Struct2002; 35: 50–58.
29.
ToutanjiH. Stress-strain characteristics of concrete columns externally confined with advanced fiber composite sheets. ACI Mater J1999; 96(3): 397–404.
30.
GhernoutiYRabehiB. FRP-confined short concrete columns under compressive loading: experimental and modeling investigation. J Reinforc Plast Compos2011; 30(3): 241–255.
31.
WuY-FWeiY-Y. Effect of cross-sectional aspect ratio on the strength of CFRP-confined rectangular concrete columns. Eng Structu2010; 32: 32–45.
32.
LiY-FLinC-TSungY-Y. A constitutive model for concrete confined with carbon fiber reinforced plastics. J Mech Mater2003; 35: 603–619.
33.
CandappaDCSanjayanJGSetungeS. Complete triaxial stress-strain curves of high-strength concrete. J Mater Civil Eng2001; 13(3): 209–215.
34.
AnsariFLiQ. High strength concrete subjected to triaxial compression. ACI Mater J1998; 95(6): 747–755.
35.
LiYFSungYY. A study on the shear-failure of circular sectioned bridge column retrofitted by using CFRP jacketing. J Reinf Plast Compos2004; 23: 811–830.
36.
Priestley MJN and Seibel F. Design of seismic retrofit measures for concrete bridges, seismic retrofit assessment and retrofit of bridges. University of California, San Diego, Structural Systems Research project, SSRP-91(3): 197–232.
37.
TsaiSWHahnHTIntroduction to composite material, Lancaster, PA: Technomic Publishing Company, 1980.
38.
RochettePLabossierePEl-BadryMM. A plasticity approach for concrete columns confined with composite materials. Proceedings of the advanced composite materials in bridges and structuresCSCE, 1996; 359–366.
39.
BerthtJFFerrierEHamelinP. Compressive behavior of concrete externally confined by composite Jackets. Part B: modeling. Constr Build Mater2006; 20: 338–347.
