Flexural Behavior of a Precast Concrete Deck Connected with Headed GFRP Rebars and UHPC.

Won Jong Chin,Jeong-Rae Cho,Jin-Young Lee,Young Hwan Park,Young-Soo Yoon

doi:10.3390/ma13030604

Abstract

Steel bent reinforcing bars (rebars) are widely used to provide adequate anchorage. Bent fiber-reinforced polymer (FRP) rebars are rarely used because of the difficulty faced during the bending process of the FRP rebars at the construction site. Additionally, the bending process may cause a significant decrease in the structural performance of the FRP rebars. Therefore, to overcome these drawbacks, a headed glass fiber-reinforced polymer (GFRP) rebar was developed in this study. The pull-out tests of the headed GFRP rebars with diameters of 16 and 19 mm were conducted to evaluate their bond properties in various cementitious materials. Moreover, structural flexural tests were conducted on seven precast concrete decks connected with the headed GFRP rebars and various cementitious fillers to estimate the flexural behavior of the connected decks. The results demonstrate that the concrete decks connected with the headed GFRP rebar and ultra-high-performance concrete (UHPC) exhibited improved flexural performance.

Highlights

The corrosion of reinforcing steel in structures decreases its life expectancy and causes extensive maintenance costs
Fiber-reinforced polymer (FRP) reinforcing bars have been extensively used as an alternative to steel reinforcement owing to their non-corrosive characteristics
While steel bent rebars are used to provide sufficient anchorage, bent fiber-reinforced polymer (FRP) rebars are rarely used because the bending process of FRP rebars at construction sites is difficult

Summary

Introduction

The corrosion of reinforcing steel in structures decreases its life expectancy and causes extensive maintenance costs. In this context, fiber-reinforced polymer (FRP) reinforcing bars (rebars) have been extensively used as an alternative to steel reinforcement owing to their non-corrosive characteristics. While steel bent rebars are used to provide sufficient anchorage, bent FRP rebars are rarely used because the bending process of FRP rebars at construction sites is difficult. The bending process can cause a significant decrease in the structural performance of FRP rebars. These problems have resulted in the development of FRP bars with a headed end to satisfy the required development length.

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