Glass FRP-Reinforced Geopolymer Based Columns Comprising Hybrid Fibres: Testing and FEA Modelling

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.

Theoretical and Experimental Substantiation of the Efficiency of Combined-Reinforced Glass Fiber Polymer Composite Concrete Elements in Bending

“…In this regard, in comparison with the works of the authors [9,[17][18][19][20][21][22][23][24][25][26][27], we obtained higher results in terms of strength and also achieved an improved microstructure of the material. All this is proposed for use not only in compressed elements, as in [18,19,[28][29][30][31][32][33], but, of course, in tensioned bending elements, which emphasizes the more rational operation of fiber-reinforced elements, since fiber reinforcement is primarily directed for bending and tensile loads. In this regard, our result surpasses the results of [6,9,14,17,18,27,[33][34][35][36][37][38].…”

“…Research on improving the characteristics and operation parameters of compressed [18,19,[28][29][30][31][32][33] and bending elements [6,9,14,17,18,27,[33][34][35][36][37][38] because of fiber reinforcement continues to expand and open new possibilities for their application. At the same time, researchers have studied the behavior of columns and beams made of steel fiber concrete [6,30], ultrahigh strength fiber concrete [36], glass geopolymer concrete with hybrid fibers [29], steel fibers [34,35], basalt fibers [34], hybrid epoxy resin, reinforced with flax or fiberglass [28], and steel fibers from scrap tires [31].…”

The Influence of Fiber on the Mechanical Properties of Geopolymer Concrete: A Review

“…Glass fiber is an inorganic non-metallic material with excellent performance. Its advantages are good insulation, strong heat resistance, good corrosion resistance, and high mechanical strength, but its disadvantages are brittleness and poor wear resistance [ 76 ]. The glass fiber is mainly made of pyrophyllite, quartz sand, limestone, dolomite, boracite, and boehmite through high-temperature melting, wire drawing, winding, weaving, and other processes.…”

Properties of 3D-Printed Polymer Fiber-Reinforced Mortars: A Review

“…Similar to single traditional fiber reinforced mortars [ 51 ], single polymer fibers, such as PE [ 43 , 44 , 52 ], PP [ 24 , 41 , 42 , 43 ] and PVA [ 25 , 32 , 43 , 45 ], have a great influence on the mechanical properties of 3DPMs. PE fiber reinforced mortar has excellent properties.…”