Study a Structural Behavior of Eccentrically Loaded GFRP Reinforced Columns Made of Geopolymer Concrete

Abstract

This study investigated a modern composite material, which is a short geopolymer concrete column (GPCC) reinforced by GFRP bars. The structural performances of GPCC subjected to eccentric load were studied and compared to the normal strength concrete column (NSCC) reinforced by steel bars. In this study, the primary experimental parameters were the reinforcement bars types, load eccentricity, and concrete types. Seven short columns were tested: three normal strength concrete columns reinforced by steel bars, three geopolymer concrete columns reinforced by GFRP bars and one normal strength concrete column without reinforcement. The model dimensions chosen in the present study was a square section of 130×130 mm and a total height of 850 mm. It was shown that the steel bars contribute about 16.47% of column capacity under concentric load. Comparing with the normal strength concrete column, a geopolymer concrete column reinforced by GFRP bars showed a little increase in ultimate load (5.17%) under concentric load. Under the load eccentricity of 130 mm, a geopolymer concrete column reinforced by GFRP bars showed a significant increase in the ultimate load (69.37%). Under large eccentricity, a geopolymer concrete column reinforced by GFRP bars has an outstanding effect on the columns' ultimate load capacity. Also, the sine form can be utilized for GPCC to find the lateral deflection along with the column high at different load values up to the failure.

Strength Enhancement, Ductility, and Confinement Effectiveness Index of Fly Ash-based Geopolymer Concrete Square Columns

“…Verification of Eq. ( 9) was carried out on test data from Albitar, et al [24], Elchalakani, et al [25], Hussein et al [26], Ganeshan N., et al [8], Sujatha [27], y = 6.8016x -0.186 R² = 0.5617…”

“…Similar results were obtained by Sujatha, et al [12] in a study on a GPC slender column with a circular cross-section. Nhabih, et al [13] studied the structural behavior of eccentrically loaded GFRP reinforced columns made of geopolymer concrete. Seven short square columns were tested.…”

Effect of Fibrous Jacket on Behavior of RC Columns

“…While the steel jacket also thin steel used as a tube and the concrete-filled this tube inside. Many researchers [31][32][33][34][35][36][37][38][39][40] were used the jacketing by ferrocement and steel jackets which showed that the ferrocement and steel jackets considered a good way to enhance the strength capacity against different load types and improve the RC columns strength. Despite the multiplication of reinforcement methods and the effectiveness of some of them on the general performance of the column, some methods are expensive, such as reinforcement with the use of a steel jacket.…”