The three-point bending fracture tests of fine aggregate concrete were conducted on an electro-hydraulic testing system with scanning electronic microscope (SEM), from which the SEM photographs of the cracks growth of fine aggregate were obtained at different load levels. The images of crack path were analyzed systematically using fractal geometry method, and it showed that the growth paths of crack were of fractal property. Besides, through the analyses in theory, the relationship between the fractal dimension... The three-point bending fracture tests of fine aggregate concrete were conducted on an electro-hydraulic testing system with scanning electronic microscope (SEM), from which the SEM photographs of the cracks growth of fine aggregate were obtained at different load levels. The images of crack path were analyzed systematically using fractal geometry method, and it showed that the growth paths of crack were of fractal property. Besides, through the analyses in theory, the relationship between the fractal dimension D of crack path and the fracture energy GF calculated by means of conventional calculation method has been derived, i.e. , which is well conformable with the test results. |