DYNAMIC CONSTITUTIVE MODEL OF BASALT FIBER REINFORCED GEOPOLYMERIC CONCRETE

Slag and fly ash were used as raw materials to produce basalt fiber reinforced geopolymeric concrete (BFRGC). Impact compressive tests on BFRGC of various fiber volume fractions were carried out using a 100mm-diameter split Hopkinson pressure bar (SHPB). For the valid SHPB tests on BFRGC specimens, the improved pulse shaping techniques were introduced. Stress versus strain curves of BFRGC at 10s1―102s1 were obtained through SHPB tests. The strength and deformation of BFRGC were analyzed, and a nonlinear viscoelastic constitutive model was established. A comparison between model results and experimental data indicates that the dynamic constitutive model can describe BFRGC’s dynamic behaviors.