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The images refer to the microstructure of the cross-section of the concrete sample. (a) Sub-domain 170 × 170 of the target pattern with stones dispersed in cement paste (adapted from [47]); (b) Initial configuration of synthetic clusters with the energy Estart = 6.2 × 10−2; (c) Optimized microstructure obtained under SA modified for clusters after 483 accepted MC-steps with Εfinal = 6.8 × 10−5 < tolerance δ = 7 × 10−5.
