Influence of modified polyurea coating thickness on the blast resistance of RC slab

To study the influence of modified polyurea coating thickness on the blast resistance performance of reinforced concrete (RC) slab, a field test was conducted with seven shots. The test recorded the dynamic response data of modified polyurea coated reinforced concrete (PRC) slab under contact explosion load, including the area and displacement of the coating deformation as well as acceleration. In addition, in order to further explore the influence law of different TNT charge quantities on coating deformation, numerical simulation research was carried out by using LS-DYNA. The test results show that, under the same explosion conditions, as the coating thickness increases, the peak displacement and residual displacement of the coating decrease, while the area of coating deformation first increases and then decreases. Increasing the thickness of the coating can also effectively reduce the speed at which peak displacement occurs, but increasing the rebound displacement may cause a secondary impact on the RC slab. By adding additional test conditions, the optimal coating thickness subjected different explosive loads can be determined, leading to the development of economical and highly resistant protective structures.