The initiation and development of damage inside cementitious materials subjected to dynamic loadings, which is manifested by the cracking and fragmentation process, have a significant contribution to the load-bearing capacity of these materials. However, current popular concrete models hypothesize that damage only initiates after the specimen reaches its peak stress, and due in part to the lack of validation from sufficient experimental data, none of the models entertain the possibility of variation in damage evolution among different types of concretes. In this study, the evolution of damage in an ultra-high-performance concrete (UHPC) and a conventional concrete (CC), characterized by the degree of strength degradation, are comparatively investigated throughout the entire pre-/post-peak deformation process as a function of carefully measured plastic strain. Well-controlled intermittent dynamic loadings are achieved on a modified Kolsky compression bar apparatus to first introduce various degrees of damage in the concrete specimens, and then the carefully preserved specimens are tested for residual strength. Coupling with pulse shaping techniques, the incident wave profiles are tailored for UHPC and CC specimens to acquire dynamic stress equilibrium and constant strain-rate deformation. Further evaluation on the residual strength of damaged specimens reveals that damage initiates prior to the peak stress, and there is a distinct difference in damage evolution between these two types of concrete materials. This investigation demonstrates a more comprehensive view of damage evolution in concrete materials and offers novel experimental data to assist the damage model development.

水泥材料内部承受动态载荷的破坏的产生和发展（通过破裂和破碎过程表明）对这些材料的承重能力具有重大贡献。但是，当前流行的混凝土模型假设损坏仅在试样达到其峰值应力后才开始，并且部分由于缺乏足够的实验数据进行验证，因此没有一个模型能够承受不同类型混凝土之间损伤演变的变化的可能性。 。在这项研究中，以强度降低的程度为特征的超高性能混凝土（UHPC）和常规混凝土（CC）的损伤演变，在整个峰前/峰后变形过程中，根据仔细测量的塑性应变进行比较研究。在改进的Kolsky压杆设备上实现了可控的间歇动态载荷，该载荷首先在混凝土试样中引入了不同程度的损伤，然后对经过精心保存的试样进行了残余强度测试。结合脉冲整形技术，为UHPC和CC样本量身定制了入射波轮廓，以获取动态应力平衡和恒定的应变率变形。进一步评估受损标本的残余强度表明，损害是在峰值应力之前开始的，并且这两种类型的混凝土材料在损害演变方面存在明显差异。