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Samples during testing and after failure: (a) lightweight block under 3-point flexural test; (b) Block without or with low-density lattice in the middle; (c) Block with high-density lattice in the middle (shear failure); (d) Block with two layers of low-density lattices close to the top and bottom of the block; (e) Dense board under 3-point flexural test; (f) Dense board after failure without lattice reinforcement.
