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Advances in Concrete Construction
  Volume 5, Number 1, February 2017 , pages 075-86

Effect of hybrid fibers on tension stiffening of reinforced geopolymer concrete
N. Ganesan, R. Sahana and P. V. Indira

    An experimental work was carried out to study the effect of hybrid fiber on the tension stiffening and cracking characteristics of geopolymer concrete (GPC). A total of 24 concentrically reinforced concrete specimens were cast and tested under uniaxial tension. The grade of concrete considered was M40. The variables mainly consist of the volume fraction of crimped steel fibers (0.5 and 1.0%) and basalt fibers (0.1, 0.2 and 0.3%). The load deformation response was recorded using LVDT‟s. At all the stages of loading after the first cracking, crack width and crack spacing were measured. The addition of fibers in hybrid form significantly improved the tension stiffening effect. In this study, the combination of 0.5% steel fiber and 0.2% basalt fiber gave a better comparison than the other combinations.
Key Words
    fiber reinforced concrete; fly ash; ground granulated blast furnace slag (GGBS); steel fibers; basalt fibers; tension stiffening; cracking
N. Ganesan, R. Sahana and P. V. Indira: Department of Civil Engineering Institute, National Institute of Technology Calicut, Kerala, India

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