Abstract
This study seeks to evaluate the effectiveness of glass-FRP-reinforced geopolymer concrete columns integrating hybrid fibres (GFGC columns) and steel bar-reinforced geopolymer concrete columns incorporating hybrid fibres (SFGC columns) under eccentric and concentric loadings. Steel fibre (SF) and polypropylene fibres (PF) are two types of fibres that are mixed into hybrid fibre-reinforced geopolymer concrete (HFRGC). Eighteen circular concrete columns with a cross-section of 300 mm × 1200 mm were cast and examined under axial loading up to failure. Nine columns were cast with glass-FRP rebars, whereas the other nine were cast with steel rebars. Using ABAQUS, a nonlinear finite element model was established for the GFGC and SFGC columns. The HFRGC material was modelled using a simplified concrete damage plasticity model, whereas the glass-FRP material was simulated as a linear elastic material. It was observed that GFGC columns had up to 20% lower axial strength (AST) and up to 24% higher ductility indices than SFGC columns. The failure modes of both GFGC and SFGC columns were analogous. Both GFGC and SFGC columns revealed the same effect of eccentricity in the form of a decline in AST. A novel statistical model was suggested for predicting the AST of GFGC columns. The outcomes of the experiments, finite element simulations, and theoretical results show that the models can accurately determine the AST of GFGC columns.
Highlights
The processing of Portland cement releases carbon dioxide as a byproduct
Fracture in the longitudinal reinforcement is the major reason for GFGC column failure, while SFGC columns fail due to the buckling of long rebars
The tensile efficiency of hybrid fibrereinforced geopolymer concrete (HFRGC) was exactly predicted in this research based on the accuracy of finite element models (FEMs) predictions for eccentrically loaded SFGC and GFGC columns
Summary
The processing of Portland cement releases carbon dioxide as a byproduct. The latest studies have used green concrete, called “geopolymer concrete”, to minimize the environmental impact of concrete structures [1,2]. Even though many studies have looked into the durability and mechanical properties of geopolymer, the integration of fibre-reinforced polymer (FRP) rebars in geopolymer columns have yet to be thoroughly researched. The critical parameters of reinforced concrete (RC) samples such as ductility and strength may be compromised due to the corrosion of steel and decreased serviceability of concrete structures. Glass-FRP rebars are gaining regulatory approval and credibility due to their high corrosion resistance, thermal conductivity, better tensile strength, and low density. FRP reinforcement is more effective in corrosive environments since it increases service life, reduces repair and overall construction costs [3,4]. FRPs along with steel rebars augmented the AST and ductility of the concrete columns as compared to plain concrete columns [10,11]. To overcome the brittleness of the concrete material, steel and polypropylene fibres were integrated into geopolymer concrete and glass-FRP rebars in this work
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