Determination of the fracture parameters of steel fiber-reinforced geopolymer concrete

摘要

The aim of this study was to analyze the fracture parameters of notched geopolymer cement concrete (GCC) beams reinforced with steel fiber volume ratios of 0% (reference), 0.25% and 0.50%, submitted to bending tests, in line with the European standard EN 14651. The fracture parameters obtained were crack mouth opening displacement (CMOD), stress intensity factor (K-I), stored energy rate (G(I)), J-integral. Residual (f(r,j)) and equivalent (f(eq,j)) flexural tensile strength were also calculated. The results confirm the efficiency of steel fibers in decreasing crack propagation and preventing brittle fractures in composites. All the fracture parameters increased with fiber reinforcement, primarily for 0.50%. The parameter G(I) was the most influenced, with a 115.8% rise compared to the unreinforced matrix.