Abstract
Due to the high quantity of carbon emissions from the cement industry, sustainable development for the built environment applications is required by utilizing geopolymers in concrete construction. Considering this problem, the structural efficiency of hybrid fiber-reinforced geopolymer concrete (HFGC) compressive elements made of basalt fiber-reinforced polymer (BFRP) bars is not well understood through experiments or numerical modeling in the literature. By conducting experiments and using finite element analysis (FEA) modeling, the primary goal of current research is to examine and compare the structural performance of BFRP-reinforced HFGC compressive elements (GHC) and steel-reinforced HFGC compressive elements (SHC), both of which are subjected to either concentric and or eccentric loading. The HFGC was created using a combination of steel and polypropylene fibers. Twelve circular compressive elements with a cross-sectional dimension of 300 mm and a height of 1200 mm were created i.e., six GHC and six SHC compressive elements. A parametric study was carried out using the proposed FEA model. The findings of the current research showed that the axial strength of GHC compressive elements was on average 91.8 % that of SHC compressive elements. Both types of elements depicted similar amounts of reduction in the axial strength when subjected to eccentric loads, for instance, 38.5 % and 144.2 % reductions were observed for GHC elements having helix spacing of 38 mm compared with the concentrically loaded counterparts. The recommended analytical relationship based on the database also performed well. The comparative study, which considers the axial involvement of main BFRP bars and the confinement effect of transverse BFRP helix, firmly supports the validity and applicability of the newly developed analytical and FEA models for capturing the axial strength of GHC compressive elements.
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