研究流态混凝土在爆炸冲击这一极端状态下养护成型后的强度性能和微观结构特征.制备了不同炸药量在半无限土体中爆炸冲击流态混凝土试块.利用岛津AG-X250电子万能岩石压力机对不同药量爆炸冲击成型的混凝土试件、同等条件养护试件和标准养护条件试件进行了单轴压缩试验.采用JSM-6510LV高低真空扫描电子显微镜成功得到了不同条件下制备的混凝土试件的微观成分结构及图像.结果表明,经炸药爆炸冲击成型的混凝土强度较同等条件养护成型混凝土强度有较大提高,且可以高于标准养护成型混凝土的强度.定性对比分析证实,爆炸冲击成型混凝土的微观结构与其强度的发展规律一致.

The mechanical properties and microscopic structures of the curing concrete in flowing state are studied under the extreme condition of explosion. The concrete test blocks are formed by different charges of explosive in semi-infinite soil. Using the SHIMADZU universal testing machine AG-X250kN system, the uniaxial compression tests are carried out to study the stress-strain curves of the concretes formed by explosion, the concretes curing under the same condition and those of the standard curing. Using the SEM JSM-6510LV system, the microscopic structure images of concretes are obtained under various conditions. It is shown that the concretes formed by explosion have significantly higher strength than those curing under the same conditions, and also higher than those of the standard curing. The qualitative analysis of the microscopic structure of concretes formed by explosion shows that the microscopic structures are in accordance with the improvement of strength.