A Study of the Dynamic Tensile Property of Ultra-high Performance Concrete
ZHANG Wenhua1, 2, 3, CHEN Zhenyu1
1 School of Civil Engineering, Nanjing Forestry University, Nanjing 210037; 2 Jiangsu Research Institute of Building Science, Nanjing 210008; 3 School of Civil Engineering, Southeast University, Nanjing 211189
Abstract: As a kind of construction material with superior mechanical properties, ultra-high performance concrete (UHPC) can notably enhance the impact resistance of properties, which is of great significance to the life security under the military protective engineering. To reveal the principle of dynamic tensile fracture caused by explosive shock wave on the free surface of protective engineering, this paper, which is based on a series of spallation experiments using the split Hopkinson pressure bar, studies the impact of coarse aggregate type, content of steel fiber and strain rate on dynamic tensile property of UHPC. Results showed that coarse aggregate type has a marked influence on spall strength. Compared with that of granite and iron ore, the impact of basalt is the most remarkabale. Besides, with the increase of steel fiber content, the dynamic tensile property is improved notably. However, there exists a limitation on the contribution to the spall strength, approximately 4%. As to the impact of the strain rate, UHPC displays a remarkable strain rate effect, especially when the strain rate varies from 7 s-1 to 50 s-1.
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2017, Vol. 31 
