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.
Highlights
The columns are more significant members of the structure as their weakness may cause a failure of adjacent structural elements leads to the collapse of the whole structure
Due to the higher compressive strength of geopolymer concrete column (GPCC), the GPCC stiffness reinforced by Glass Fiber Polymer (GFRP) bars is more than the normal strength concrete column (NSCC) stiffness reinforced by steel bars
Results exhibit an extremely high closeness for experimental with analytical results. This states that sine form of normal strength concrete columns can utilize to geopolymer concrete columns reinforced by GFRP bars to calculate the lateral deflection along with the height of column during different loading stages up to failure
Summary
The columns are more significant members of the structure as their weakness may cause a failure of adjacent structural elements leads to the collapse of the whole structure. In this regard, Glass Fiber Polymer (GFRP) bars and the Geopolymer concrete (GPC) can be employed. The manufacture of (PC) contributes nearly 6.8% of total carbon dioxide quantity [4] This nearly adds (1600000) milliard kilo gram of (CO2) into the environment [5]. This denotes more satisfying to investigate the substitute binding by less of emission of CO2 for a concrete product. With this regard, Geopolymer binder can be utilized. The geopolymer concrete compressive strength is either superior or nearer than that of the normal strength concrete of similar quality [13, 14]
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