In order to analyze increasingly common 3D image data, new techniques are required. Some of these techniques can be derived from traditional 2D image processing, while others must be created for a particular problem. Using various 3D techniques, we are analyzing high resolution tomographic data of concrete in order to study its fracture energy and permeability. The techniques we are using inclu...

Following the formulation of the constitutive model in the preceding Part I in this issue, the present Part II addresses the problems of computational algorithm and convergence of iterations. Typical numerical responses are demonstrated and the parameters of the model are calibrated by test data from the literature. DOI: 10.1061/(ASCE)0733-9399(2005)131:1(41) CE Database subject headings: Concr...

To investigate the fracture properties of rock-concrete interface after fatigue loading, tests with maximum loads 60% and 70% ultimate load were carried out under three-point bending (TPB) loading. After 80,000 loading cycles, specimens subjected to quasi-static TPB until failure. The parameters—including nominal initial toughness K1Cini, unstable K1Cun, critical crack length ac, energy Gf, cha...