Clay brick masonry unit (CBMU) walls are widely used in building structures, and its damage and protection under explosion loads have been a matter of concern in the field of engineering protection. In this paper, a series of full-scale experiments of the response characteristics of 24 cm CMBU walls unreinforced and reinforced with polyurea elastomer subjected to blast loading were carried out. Through setting 5.0 kg TNT charges at different stand-off distances, the damage characteristics of masonry walls at different scaled distances were obtained. The reinforcement effect of different polyurea coating thicknesses and methods on the blast resistance performance of masonry walls under single and repeated loads were also explored. Five failure grades were summarized according to the dynamic response features of masonry walls. Based on the stress wave propagation pattern in multi-media composite structures, the internal stress distribution of masonry walls were analyzed, and the division basis of the masonry walls’ failure grades was then quantified. Combined with Scanning Electron Microscope(SEM) images, the deformation characteristics of soft and hard segments of polyurea and effects of detonation products on microstructures were revealed respectively, which provides an important reference for the design and application of polyurea in the blast resistance of clay brick masonry walls.

粘土砖砌体单元（CBMU）墙体广泛应用于建筑结构中，其在爆炸荷载作用下的破坏和防护一直是工程防护领域关注的问题。在本文中，对 24 cm CMBU 墙体在爆炸载荷下未加固和聚脲弹性体加固的响应特性进行了一系列全尺寸实验。通过在不同距离设置5.0 kg TNT炸药，获得了不同尺度距离下砌体墙体的破坏特性。还探讨了不同聚脲涂层厚度和方法对砌体墙体在单次和重复荷载作用下的抗爆性能的加固效果。根据砌体墙体的动力响应特征，总结出5个破坏等级。基于应力波在多媒体复合结构中的传播模式，分析了砌体墙体的内应力分布，量化了砌体墙体破坏等级的划分依据。结合扫描电镜（SEM）图像，分别揭示了聚脲软段和硬段的变形特征以及爆轰产物对显微组织的影响，为聚脲在粘土砖抗爆性方面的设计和应用提供了重要参考。砌体墙。