Abstract
This paper presents experimental testing of various types of concrete under impact loading by using a 2.8-second drop shaft. The drop shaft is located in the Josef Underground Laboratory and allows dropping a projectile from 40 meters that results in a maximal velocity of 100 km/h. Three basic types of concrete were used in the framework of this study. This was normal strength concrete, fibre-reinforced concrete, and high-performance fibre-reinforced concrete. The slabs were constructed 1700 mm × 500 mm × 70 mm in size and the clear span of the impacted slab was 1500 mm. Damage of the slab was recorded and the velocity of the projectile was measured with the high-speed camera before and after the impact. It was demonstrated that high-performance fibre-reinforced concrete has a higher ability to absorb and dissipate the kinetic energy of the impact that their lower strength counterparts.
Highlights
Concrete is the most widely used building material in the world and is often used for various fortifications
Current research in concrete and concrete structures resulted in the development of high-performance fibre-reinforced concrete (HPFRC) with enhanced strength and toughness, which benefits mainly from the fibre reinforcement
Used concrete was characterised by the standard amount of cement and the usual compressive strength typically achieved for normal strength concrete
Summary
Concrete is the most widely used building material in the world and is often used for various fortifications. Current research in concrete and concrete structures resulted in the development of high-performance fibre-reinforced concrete (HPFRC) with enhanced strength and toughness, which benefits mainly from the fibre reinforcement. This is advantageous in case of elevated strain rate loading. Elevated strain rate loading is very fast and results in extensive damage because most of the energy is dissipated for the fracture rather than for the deformation of the loaded element. The first is quasi-static loading and the second is impact loading. The strain rate for quasi-static loading is usually around 10-6s-1 and the strain rate for impact loading is usually around 102s-1 [1].
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