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Behavior of concentrically loaded geopolymer-concrete circular columns reinforced longitudinally and transversely with GFRP bars
Highlights Investigation of the circular geopolymer-concrete columns reinforced with GFRP bars. Effect of hoops and spirals reinforcements with different spacing. Behavior of short and slender concrete columns. Evaluation of the load–deformation, confinement efficiency and ductility index.
Abstract The behavior of concentrically loaded geopolymer-concrete circular columns reinforced longitudinally and transversely with glass–fiber-reinforced-polymer (GFRP) bars was investigated. Six full-scale short columns (L/r =8) were cast: one column without transverse reinforcement; three columns with circular hoops spaced at 50mm, 100mm, and 200mm on centers; and two columns with spirals spaced at 50mm and 100mm on centers. In addition, two slender columns (L/r =16) transversely reinforced with hoops and spirals both spaced at 100mm on centers were fabricated. Based on the experimental results, the GFRP bars contributed an average of 7.6% to the overall capacity of the tested columns. The hoop- and spiral-confined slender columns failed at a load equal to 66% and 82%, respectively, of the strength of their counterpart short columns. Irrespective of the tie configuration, the columns with higher volumetric ratios showed better compressive behavior than those with lower volumetric ratios. The ductility and confinement efficiency of the spiral-confined columns were higher than that of their counterpart hoop-confined columns. The tested columns yielded relatively superior compression performance compared to OPC-based concrete columns reinforced with GFRP bars and ties. Further studies dealing with the behavior and slenderness limit in GFRP-reinforced geopolymer concrete slender columns are recommended to increase its uptake in the construction industry.
Behavior of concentrically loaded geopolymer-concrete circular columns reinforced longitudinally and transversely with GFRP bars
Highlights Investigation of the circular geopolymer-concrete columns reinforced with GFRP bars. Effect of hoops and spirals reinforcements with different spacing. Behavior of short and slender concrete columns. Evaluation of the load–deformation, confinement efficiency and ductility index.
Abstract The behavior of concentrically loaded geopolymer-concrete circular columns reinforced longitudinally and transversely with glass–fiber-reinforced-polymer (GFRP) bars was investigated. Six full-scale short columns (L/r =8) were cast: one column without transverse reinforcement; three columns with circular hoops spaced at 50mm, 100mm, and 200mm on centers; and two columns with spirals spaced at 50mm and 100mm on centers. In addition, two slender columns (L/r =16) transversely reinforced with hoops and spirals both spaced at 100mm on centers were fabricated. Based on the experimental results, the GFRP bars contributed an average of 7.6% to the overall capacity of the tested columns. The hoop- and spiral-confined slender columns failed at a load equal to 66% and 82%, respectively, of the strength of their counterpart short columns. Irrespective of the tie configuration, the columns with higher volumetric ratios showed better compressive behavior than those with lower volumetric ratios. The ductility and confinement efficiency of the spiral-confined columns were higher than that of their counterpart hoop-confined columns. The tested columns yielded relatively superior compression performance compared to OPC-based concrete columns reinforced with GFRP bars and ties. Further studies dealing with the behavior and slenderness limit in GFRP-reinforced geopolymer concrete slender columns are recommended to increase its uptake in the construction industry.
Behavior of concentrically loaded geopolymer-concrete circular columns reinforced longitudinally and transversely with GFRP bars
Maranan, G.B. (author) / Manalo, A.C. (author) / Benmokrane, B. (author) / Karunasena, W. (author) / Mendis, P. (author)
Engineering Structures ; 117 ; 422-436
2016-03-14
15 pages
Article (Journal)
Electronic Resource
English