Study on tensile properties of lightweight engineered geopolymer concrete
Considering the influences of polyvinyl alcohol(PVA)fibers and multi-walled carbon nanotubes(MWCNTs),nine sets of lightweight engineered geopolymer composite(LW-EGC)concrete specimens were prepared.The failure modes of LW-EGC were studied by uniaxial tensile test,and the effects of PVA and MWCNTs on the tensile stress-strain curve,ultimate tensile strain and stress of LW-EGC were analyzed.The results show that all specimens exhibit strain hardening behavior with multiple cracks.The uniaxial tensile force of LW-EGC can be divided into linear elastic stage,strain hardening stage,and failure stage.When the content of PVA and MWCNTs was 2.0％and 0.15％,the ultimate tensile strain and stress of LW-EGC were 7.05％and 2.41 MPa,respectively.Based on the experimental study,the stress-strain constitutive model of LW-EGC under uniaxial tensile stress is established,and the predicted values of the model are in good agreement with the experimental values.
geopolymeruniaxial tensilestrain hardeningconstitutive relation model
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