Abstract
Fiber reinforced polymer (FRP) reinforcing bars for concrete structure has been extensively investigated for last two decades and a number of FRP bars are commercially available. However, one of shortcomings of the existing FRP bars is its low elastic modulus, if glass fibers are used (i.e., GFRP). The main objective of this study using the concept of material hybridization is to develop a viable hybrid FRP bar for concrete structures, especially for marine and port con- crete structures. The purposes of hybridization are to increase the elastic modulus of GFRP bar with acceptable tensile strength. Two types of hybrid GFRP bar were considered in the development: GFRP crust with steel core and GFRP bar with steel wires dispersed over the cross-section. Using E-glass fibers and unsaturated polyester resins, the hybrid GFRP bar samples of 13 mm in diameter were pultruded and tested for tensile properties. The effect of hybridization on tensile properties of GFRP bars was evaluated by comparing the results of tensile test with those of non-hybrid GFRP bars. The results of this study indicated that the elastic modulus of the hybrid GFRP bar was increased by up to 270 percent by the material hybridization. The results of the test and the future recommendations are summarized in this paper. To ensure long-term durability of the hybrid GFRP bars in waterfront structure applications, the individual and combined effects of environmental conditions on hybrid GFRP rebar itself as well as on the interface between rebar and concrete should be accessed.
Highlights
Fiber Reinforced Polymer (FRP) is widely used as an alternative material to resolve the corrosion problem of the steel reinforcement and to increase the service life of reinforced concrete (RC) structures
FRP rebar can provide high tensile strength as well as good resistance to corrosion comparing to the steel reinforcement [1] for RC structures, especially ones exposed to corrosive environments such as sea water
The purpose of this study is to identify a feasible material hybridization of the glass fiber reinforced polymer (GFRP) reinforcing bar to be used for concrete structures
Summary
Fiber Reinforced Polymer (FRP) is widely used as an alternative material to resolve the corrosion problem of the steel reinforcement and to increase the service life of reinforced concrete (RC) structures. Glass and carbon are commonly used fiber materials. Carbon fiber provides even higher tensile strength and more elastic modulus than steel. These are advantageous features of using carbon fiber in a structural point of view but not in economics, since its price is almost ten times higher than glass fiber. Low modulus of elasticity is a main disadvantage of using glass fiber, which attains the elastic modulus less than a quarter of steel. This leads to excessive deflection when FRP rebar was used as the reinforcement for flexural members. The hybridization of FRP has been investigated by many researchers [2,3,4,5]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
