Abstract
Geopolymer concrete reinforced with Glass fiber-reinforced polymer (GFRP) bar presents a novel, durable, eco-friendly strengthening system with significant promise for practical engineering. To employ this strengthening system, a clear understanding of the bond performance between GFRP bars and geopolymer concrete under bending conditions is essential. Interface behaviors of GFRP bars-geopolymer concrete was investigated using hinged beam tests, considering the following parameters: concrete type(geopolymer and ordinary), concrete strength(C30, C50, C70), surface treatment of bars(shallow thread, spiral wrap ribs, and sandblasted), bar diameters(6 mm, 10 mm, and 16 mm), and bond lengths(2, 4, and 8 times the bar diameter). Results indicate a consistent bond mechanism between geopolymer and ordinary concrete. The bond strength increases with higher concrete strength, and the initial bond stiffness is improved by spiral wrap ribs. Moreover, the mBPE model was used to describe the local bond-slip relationship, and the effects of different parameters on interface shear stress distribution were discussed. The development length of GFRP bars in concrete was evaluated and compared with existing codes. These findings provide valuable references for the performance assessment and optimization of GFRP bar-reinforced geopolymer concrete structures in engineering applications.
Published Version
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