13th International Conference on Fracture June 16–21, 2013, Beijing, China position eventually, it may suggest there is no space available for new particles within the current sieve range. The next sieve range will be processed if no availability for the current sieve range is concluded, or all the particles within the current sieve range have already been placed. The above trial-and-error procedure is called parking procedure and it is the essential of the Anm material model. Concrete specimen of the size 150 mm in the cubic shape is simulated by the Anm material model. The specimen has two phases, the mortar matrix and crushed stone aggregates. Non-periodic material boundary applies, which requires all the particles are inside the specimen and no part of a particle can pass through a surface. The total mass of the crushed stones is 2653 g, the corresponding volume is 1001132 mm3, and 64% of which are in the sieve 8~16 mm, the rest 36% are in the sieve 4~8 mm. The particle size is taken as the particle width and its distribution for the coarse aggregates is given in Figure 1. The volume percentage of the crushed stones in the concrete specimen is 30%. The simulated material structure of the concrete specimen with irregular shape crushed stones is sketched in Figure 2. 0 10 20 30 40 50 60 70 80 90 100 4 6 8 10 12 14 1 Particle Width (mm) Cumulative % 6 Figure 1. Particle size distribution for the coarse aggregates in concrete Figure 2. The material structure of the 150 mm concrete specimen with irregular shape crushed stones -3-
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