Abstract Reinforced concrete structure can respond in a brittle manner with highly localised damage like concrete spalling, cratering and reinforcement rupturing under contact explosions. High speed fragmentation resulting from concrete spall may cause severe casualties and injuries. It is therefore important to restrained concrete fragments and improve collapse resistance of the slab. The present work is intended to evaluate the effectiveness of coated polyisocyanate-oxazodone (POZD) on the explosive resistant performance of concrete slabs. Contact explosion tests with different TNT charge mass were carried out. Eleven slabs including a control specimens (NRC) and ten coated with different thickness of POZD slabs are tested. By observing the damage level of the slabs, the failure mode and anti-collapse mechanism of the POZD coating were studied and analyzed. It is found that the main local failure modes of POZD-coated reinforced concrete slabs can be divided into: cratering, spalling and coating bulging, slab perforation and the coating large area bulging, punching and coating perforation. The bulging of the POZD coating is mainly due to the detachment of the POZD coating from the base slab and the occurrence of large plastic deformation under the action of the explosion shock wave. Under the strong blast load, the POZD coating can still maintain large deformation and high plasticity. With the increase of the thickness of the POZD coating, the stronger the anti-explosion ability of the slab under the contact explosion, the more the critical damage charge mass of the slab. Based on the test results, empirical equations for the failure and deformation parameters of reinforced concrete slabs are presented, and an empirical formula for the spalling damage coefficient is also given.

中文翻译：

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聚异氰酸酯-恶唑酮涂层方形钢筋混凝土板接触爆炸试验研究

摘要 钢筋混凝土结构在接触爆炸下会以脆性方式响应高度局部损伤，如混凝土剥落、弹坑和钢筋破裂。混凝土剥落造成的高速碎裂可能会造成严重的人员伤亡。因此，重要的是抑制混凝土碎片并提高楼板的抗倒塌能力。目前的工作旨在评估涂层聚异氰酸酯 - 恶唑酮 (POZD) 对混凝土板抗爆性能的有效性。进行了不同 TNT 装药质量的接触爆炸试验。测试了 11 个板坯，包括一个对照试样 (NRC) 和 10 个涂有不同厚度 POZD 板坯的板。通过观察板坯的损坏程度，对POZD涂层的失效模式和抗塌陷机理进行了研究和分析。研究发现POZD涂层钢筋混凝土板的主要局部破坏模式可分为：缩孔、剥落和涂层鼓包、板穿孔和涂层大面积鼓包、冲孔和涂层穿孔。POZD涂层鼓包主要是由于POZD涂层在爆炸冲击波的作用下与底板脱离，发生较大的塑性变形。在强大的爆炸载荷作用下，POZD涂层仍能保持大变形和高塑性。随着POZD涂层厚度的增加，板坯在接触爆炸作用下的抗爆能力越强，板坯的临界损伤装药质量越多。根据测试结果，