Dynamic test devices for analyzing the tensile properties of concrete
Owing to their low tensile failure strain, concrete is a difficult material to test under dynamic tensile loading. Indeed, conventional testing apparatuses such as high-speed hydraulic presses or Split Hopkinson Bar facilities rely on a mechanical balance of the specimen implying a short round-trip time in the specimen in comparison with the loading time to failure and consequently loading-rates below few hundreds of GPa/s. Above this threshold the specimen is clearly unbalanced and these methods are inadequate. Other techniques, such as spalling tests, plate-impact experiments that do rely on stress-wave analysis or edge-on impact tests that are used to visualize the tensile damage in the target, then come into play. In this chapter, different experimental methods are sorted in four sets to point out their field of use, their limitations and a number of results obtained in the literature.