Abstract
Test data from the fracturing of large specimens of traditional unreinforced aggregate concrete of the double cantilever beam (DCB) type have demonstrated the existence of an extensive damage length forward of the notch root (determined by the single-dimensional acoustic-emission location technique). It is observed that the energy necessary for fracture increases as the crack propagates. This situation is characterized by a curve “R” (fracture energy as a function of crack propagation). The stationary value of the fracture energy can be much greater than the crack initiation value at the notch root.
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