An experimental program was conducted to examine the bond characteristics of Carbon Fibre Reinforced Plastic, CFRP, prestressing tendons in pretensioned concrete beams. The bond characteristics are examined through measurements of the transfer and development lengths as well as their corresponding bond stresses. The two types considered are Leadline bars, produced by Mitsubishi Chemical Corporation (Japan), and Carbon Fibre Composite Cable, CFCC, produced by Tokyo Rope Manufacturing Company (Japan). Three diameters 10.5, 12.5, and 15.2 mm were considered for CFCC and 8 mm diameter of Leadline was used. Eight prestressed concrete beams pretensioned with 8 mm diameter Leadline bar and sixteen prestressed concrete beams pretensioned by CFCC strands were constructed and tested using different shear span values. This paper proposes equations to predict transfer and flexural bond lengths for both Leadline bars and CFCC strands. The proposed equations are in good correlation with the measured values and it was compared to the current ACI equations as well as other recent proposed models for steel strands. This information provides data for the development of design considerations and codes for concrete beams pretensioned by CFRP reinforcement.
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