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Experimental Investigation on Debonding between FRP sheets and Structures  

, M.Sc. Thesis Sharif University of Technology Haghighi, Sina (Author) ; Toufigh, Vahab (Supervisor)
Abstract
This study has investigated the effects of different environmental conditions on the bond at the interface between two fiber reinforced polymer (FRP) layers. A total of 945 single lap splice coupons with three bond length were made using wet lay-up technic. There were used three unidirectional fabrics and one type of epoxy resin. A Uniaxial tensile test was performed on samples after 2, 4, 12, 20, 28, 36 and 48 weeks of exposure. Also series of test were conducted in order to determine the minimum lap splice length of single splice FRP samples. The experimental results indicated reduction of bond strength in glass specimens that was 17 % after 48 weeks of exposure while for same amount of... 

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Experimental Investigation on Debonding between FRP sheets and Structures  

, M.Sc. Thesis Sharif University of Technology Haghighi, Sina (Author) ; Toufigh, Vahab (Supervisor)
Abstract
This study has investigated the effects of different environmental conditions on the bond at the interface between two fiber reinforced polymer (FRP) layers. A total of 945 single lap splice coupons with three bond length were made using wet lay-up technic. There were used three unidirectional fabrics and one type of epoxy resin. A Uniaxial tensile test was performed on samples after 2, 4, 12, 20, 28, 36 and 48 weeks of exposure. Also series of test were conducted in order to determine the minimum lap splice length of single splice FRP samples. The experimental results indicated reduction of bond strength in glass specimens that was 17 % after 48 weeks of exposure while for same amount of... 

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  • List of Figures (7)
  • List of Tables (9)
    • Introduction (10)
  • 1.1 Introduction (10)
  • 1.2 Previous work (11)
  • 1.2.1 Environmental effects on the bond and the interface of FRP and concrete (11)
  • 1.2.2 Environmental effects on the bond at the interface of FRPs and Steel (13)
  • 1.2.3 Environmental effects on the bond at the interface of FRPs and masonry (14)
  • 1.2.4 Environmental effects on the bond at the interface of FRPs and timber (16)
  • 1.2.5 Environmental effects on the mechanical properties of FRPs (16)
  • 1.3 Scope and objectives (19)
    • Materials and Method (20)
  • 2.1 Fiber reinforced polymer (20)
  • 2.2 Environments (22)
  • 2.2.1 Acid (pH of 2.5) (22)
  • 2.2.2 Alkaline (pH of 10 and 12.5) (22)
  • 2.2.3 Seawater (pH of 7.25) (22)
  • 2.2.4 Fresh water (pH of 7) (23)
  • 2.3 Standards (23)
  • 2.4 Reservoirs (23)
  • 2.5 Testing Program (23)
  • 2.5.1 Minimum lap spliced length (23)
  • 2.5.2 Single-lap shear test procedure (30)
    • The long-term evaluation of interface between Glass Fabrics (GFRP) (31)
  • 3.1 Abstract (31)
  • 3.2 Results and Discussion (32)
  • 3.2.1 Acidic solution (pH of 2.5) (32)
  • 3.2.2 Alkaline solutions (pH of 10) (33)
  • 3.2.3 Alkaline solutions (pH of 12.5) (34)
  • 3.2.4 Sea water solutions (pH of 7.25) (35)
  • 3.2.5 Fresh water solutions (pH of 7) (36)
  • 3.2.6 Modes of failure (40)
    • The long-term evaluation of interface between Aramid fabrics (AFRP) (44)
  • 4.1 Abstract (44)
  • 4.2 Results and discussion (45)
  • 4.2.1 Acidic solution (pH of 2.5) (45)
  • 4.2.2 Alkaline solutions (pH of 10) (46)
  • 4.2.3 Alkaline solutions (pH of 12.5) (47)
  • 4.2.4 Sea water solutions (pH of 7.25) (48)
  • 4.2.5 Fresh water solutions (pH of 7) (49)
  • 4.2.6 Modes of failure (53)
    • The long-term evaluation of interface between Carbon fabrics (CFRP) (57)
  • 5.1 Abstract (57)
  • 5.2 Results and discussion (58)
  • 4.2.1 Acidic solution (pH of 2.5) (58)
  • 4.2.2 Alkaline solution (pH of 10) (59)
  • 4.2.3 Alkaline solution (pH of 12.5) (60)
  • 4.2.4 Sea water solution (pH of 7.25) (61)
  • 4.2.5 Fresh water solution (pH of 7) (62)
  • 4.2.6 Modes of failure (66)
    • Conclusions and future works (68)
  • 6.1 Summary and conclusions (68)
  • 6.2 Direction to Future Work (69)
  • References (70)
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