Bond performance of GFRP and deformed steel hybrid bar with sand coating to concrete. (March 2017)

• Record Type: Journal Article
• Authors: Ju, Minkwan; Park, Gitae; Lee, Sangyun; Park, Cheolwoo
• Is Part Of: Journal of reinforced plastics and composites. Volume 36:Number 6(2017)
• Page Start: 464
• Page End: 475
• Publication Date: 2017-03
• Subjects: GFRP and deformed steel hybrid bar -- sand coating -- modulus of elasticity -- bond test -- surface design parameter -- modified BPE model; Reinforced plastics -- Periodicals; Composite materials -- Periodicals; 620.1923
• DOI: 10.1177/0731684416684209
• Languages: English
• ISSNs: 0731-6844

Abstract

In this study, we experimentally investigated the bond performance of a glass fiber-reinforced polymer hybrid bar with a core section comprising a deformed steel bar and a sand coating. The glass fiber-reinforced polymer and deformed steel hybrid bar (glass fiber-reinforced polymer hybrid bar) can contribute to longer durability and better serviceability of reinforced concrete members because of the increased modulus of elasticity provided by the deformed steel bar. Uniaxial tensile tests in compliance with ASTM D 3916 showed that the modulus of elasticity of the glass fiber-reinforced polymer hybrid bar was enhanced up to three times. For the bond test, a total of 30 specimens with various sand-coating and surface design parameters such as the size of the sand particles (0.6 mm and 0.3 mm), sand-coating type (partially or completely), number of strands of fiber ribs (6 and 10), and pitch space (11.4 mm to 29.1 mm) of the fiber ribs were tested. The completely sand-coated glass fiber-reinforced polymer hybrid bar exhibited a higher bond strength (90.5%) than the deformed steel bar and a reasonable mode of failure in concrete splitting. A modification parameter to the Eligehausen, Popov, and Bertero (BPE) model is suggested based on the representative experimental tests. The bond stress–slip behavior suggested by the modified BPE model in this study was in reasonable agreement with the experimental results.