The phenomenon of the size-dependence of the concrete fracture energy is discussed. It is shown that the scaling of toughness can be consistently interpreted by means of a fractal model, the influence of microstructural disorder being predominant. Moreover, at the…
The phenomenon of the size-dependence of the concrete fracture energy is discussed. It is shown that the scaling of toughness can be consistently interpreted by means of a fractal model, the influence of microstructural disorder being predominant. Moreover, at the larger scales, the fields homogeneization progressively comes into play, leading to the multifractal scaling of the physical properties. A Multifractal Scaling Law (MFSL) is proposed for the fracture energy Qp, following the MFSL already applied to the scale-dependence of strength (Carpinteri et al., 1994). By means of best-fitting of the test data, the full range of the scaling is described and an asymptotic value of Qp, valid for real-sized structures, can be determined.