2018 Volume 74 Issue 1 Pages 10-20
This study aims to propose the mechanical models of fiber reinforced Porosity Free Concrete (PFC). The compression test, splitting cylinder test, and bending test of PFC specimens were conducted to investigate the mechanical properties of fiber reinforced PFC. The material characteristics of PFC such as the characteristic values for material strength, the compressive stress-strain relationships, and the the tension softening curve were proposed from each material test and the inverse analysis based on the results of three-point bending test, respectively. Furthermore, the size dependence of the flexural strength of fiber reinforced PFC was investigated through the four-point bending test and the finite element analysis with a discrete crack model. Based on the results of this FEM analysis, an equation to predict the flexural strength was proposed for PFC beams with the various height. Moreover, the equivalent specific length of fiber reinforced PFC beam with various height was also determined based on the numerical study using fiber modeling analysis. Finally, the tensile stress - strain relationships were obtained by the use of the equivalent specific length in order to convert the crack width of the tension softening curve into the strain.
