Location

Portland State University

Start Date

2-5-2018 11:00 AM

End Date

2-5-2018 1:00 PM

Subjects

Carbon fiber-reinforced plastics, Prestressed concrete -- Bonding -- Testing

Abstract

High tensile strength, adjustable and high modulus of elasticity, high strength-to-weight ratio, and non-corrosiveness are great features which have made Fiber Reinforced Polymer (FRP) very attractive to engineers. Prestressed concrete applications require high strength prestressing material that could apply and maintain effective compressive force to concrete members. Although FRPs, especially Carbon FRP (CFRP), have the desired strength, no efficient system for its anchorage to concrete has been devised yet. This paper presents an experimental evaluation on new bond-type CFRP anchors. A total of eleven samples were prepared and tested. The CFRP rods were 0.375 in. and 0.50 in. diameter. The parameters investigated were the embedded length, rod diameter, and time of curing. Using the proposed bond-type CFRP anchors, the experimental results showed that 12 in. and 15 in. were adequate embedded lengths to effectively anchor the 0.375 in. and 0.50 in. CFRP rods, respectively. The results also indicated that the anchor stiffness was directly proportional to the embedded length, and cross sectional area ratio of CFRP rods to anchor borehole affected the stiffness and bonding capacity.

Persistent Identifier

http://archives.pdx.edu/ds/psu/25028

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May 2nd, 11:00 AM May 2nd, 1:00 PM

Bond-Type CFRP Anchorage System for Prestressed Concrete Applications

Portland State University

High tensile strength, adjustable and high modulus of elasticity, high strength-to-weight ratio, and non-corrosiveness are great features which have made Fiber Reinforced Polymer (FRP) very attractive to engineers. Prestressed concrete applications require high strength prestressing material that could apply and maintain effective compressive force to concrete members. Although FRPs, especially Carbon FRP (CFRP), have the desired strength, no efficient system for its anchorage to concrete has been devised yet. This paper presents an experimental evaluation on new bond-type CFRP anchors. A total of eleven samples were prepared and tested. The CFRP rods were 0.375 in. and 0.50 in. diameter. The parameters investigated were the embedded length, rod diameter, and time of curing. Using the proposed bond-type CFRP anchors, the experimental results showed that 12 in. and 15 in. were adequate embedded lengths to effectively anchor the 0.375 in. and 0.50 in. CFRP rods, respectively. The results also indicated that the anchor stiffness was directly proportional to the embedded length, and cross sectional area ratio of CFRP rods to anchor borehole affected the stiffness and bonding capacity.