Abstract: In order to study the protective effect of sprayed anti-blast polyurea QtechT26 (T26) on reinforced concrete slabs under explosive load, thermogravimetric analysis (TGA) was performed on T26, and its thermal stability under high temperature environment was studied. A non-contact explosion test was carried out on T26-coated reinforced concrete slabs, combined with scanning electron microscopy (SEM) and Fourier infrared spectroscopy (FTIR), the macroscopic failure mode of the structure and the microscopic damage behavior of the coating under the action of 10kg TNT were obtained. Using LS-NYNA to numerically simulate the test process and compare with the test results, the effect of T26 coating on the anti-blast performance of reinforced concrete slabs and the energy dissipation mechanism of the coating are analyzed. The research results show that the initial degradation temperature of T26 is 265 ℃, and the final degradation temperature is 510 ℃. The temperature at the beginning of degradation and the completion of degradation are both high, and it has good thermal stability. The main failure mode of the T26-coated reinforced concrete slab is the partial tearing of the front surface coating and a certain bulge. The maximum bulge height is 30 mm, and the front surface presents a high-temperature ablation. The coating on the back explosion surface and the side surface is not damaged, and the internal reinforced concrete slab is not significantly deformed. Under the coupling effect of the explosion shock wave and the high temperature, a large amount of molten flocs appear on the section and surface of the T26 coating. The total hydrogen bonding degree and the perfect hydrogen bonding degree of the surface are reduced by 21.5% and 18.2%, respectively, compared with before the explosion. The numerical simulation and the experimental results are in good agreement, indicating that the numerical model is reliable. The T26 coated reinforced concrete slab under the numerical simulation can absorb and transform more energy, and the anti-blast effect is better. Explosion test and numerical simulation results have proved that T26 coating can effectively enhance the anti-blast performance of reinforced concrete slabs, which can provide an important reference for the research of polyurea in the field of structural explosion protection.
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2021, Vol. 35 
