| Nacre from mollusk shell is a highly mineral material, composed of 95% calcium carbonate(CaCO3) and 5% organic matter. CaCO3 is a brittle material, with ordinary strength, toughness and hardness. However, while microscopic mineral tablets boned by a tough organic matter, nacre from mollusk shell performs extraordinary mechanical properties, with 3000 times fracture toughness than normal CaCO3 crystal. Research shows that the microscopic mineral tablets can slide over and lock each other is the main reason for the toughness amplification of nacre from mollusk shell.By using microstructure of nacre from mollusk shell for reference, a new pattern of masonry block with bowknot-shape was designed in this paper. Through experiments for the basic mechanical performance of bowknot-shape masonry under different load condition, the paper obtained the failure process and mode of masonry under compression, tension and three-point bending load, and also calculated the corresponding strength of the masonry.By using toughening mechanism of nacre from mollusk shell for reference, a new pattern of bio-inspired mortar-less reinforced protecting wall based on the microstructure of nacre from mollusk shell was designed. Then, the paper completed the manufacture of the bio-inspired protecting wall, referencing Post-Tensioned Method in practical engineering, and also investigated the prestress tension method for small-sized mortar-less reinforced masonry wall.And then the paper conducted an out-of-plane load test for the bio-inspired protecting wall, analyzed the deformation and energy dissipation properties under concentrated load, and came to conclusions for the factors influencing the deformation and energy dissipation capacity of the bio-inspired protecting wall. Experiment shows that the bio-inspired protecting wall proposed in this paper effectively achieved the biomimetics of the microstructure and the toughness amplification mechanism of nacre. |
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